From 9b683d223e06fc5ec9e2561c659de5a79d3a8194 Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Thu, 10 Sep 2020 21:15:00 +0300
Subject: [PATCH 1/5] Separate multiline code block language from remaining
 parameters Parse document property Parse separators

---
 .../sixth/core/document/Document.java         |  2 +-
 .../svjatoslav/sixth/core/document/Utils.java |  4 +
 .../content/DocumentPropertyCollection.java   | 40 ++++++++
 .../core/document/content/ListElement.java    | 91 ++++++++++++++++---
 .../core/document/content/MultilineCode.java  | 16 +++-
 .../document/content/PropertyCollection.java  | 14 ---
 .../core/document/content/Separator.java      | 20 ++++
 .../core/document/content/TextBlock.java      | 17 +++-
 8 files changed, 168 insertions(+), 36 deletions(-)
 create mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/PropertyCollection.java
 create mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java

diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Document.java b/src/main/java/eu/svjatoslav/sixth/core/document/Document.java
index e4c45bd..c61d613 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Document.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/Document.java
@@ -62,7 +62,7 @@ public class Document {
 
         // DocumentProperty:
         // "#+OPTIONS: H:20 num:20"
-        tokenizer.addTerminator(PRESERVE, "#\\+[^\\s]+:.*\\r?\\n", TG_DOCUMENT_PROPERTY);
+        tokenizer.addTerminator(PRESERVE, "#\\+([^\\s]+):(.*)\\r?\\n", TG_DOCUMENT_PROPERTY);
 
         // Drawer property:
         //  " :ID:       533734b9-0456-4448-9830-a43646345615"
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java b/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
index 406e7ef..00166ef 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
@@ -20,4 +20,8 @@ public class Utils {
         return sb.toString();
     }
 
+    public static boolean isBlank(String s){
+        return s.trim().length() == 0;
+    }
+
 }
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
new file mode 100644
index 0000000..adb3c12
--- /dev/null
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
@@ -0,0 +1,40 @@
+package eu.svjatoslav.sixth.core.document.content;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Things like:
+ * #+RESULTS:
+ * #+LATEX_HEADER: \\usepackage{parskip}
+ * #+OPTIONS: H:20 num:20
+ * #+attr_latex: :width 300px
+ */
+
+public class DocumentPropertyCollection implements Content {
+    private Map<String, List<String>> keyToValue = new HashMap<>();
+
+    @Override
+    public void toMD(StringBuilder sb, int indent) {
+    }
+
+    public void addProperty(String key, String value){
+        getOrCreateValueList(key).add(value);
+    }
+
+    private List<String> getOrCreateValueList(String key){
+        String actualKey = key.toLowerCase();
+        if (keyToValue.containsKey(actualKey))
+            return keyToValue.get(actualKey);
+
+        List valueList = new ArrayList<String>();
+        keyToValue.put(actualKey, valueList);
+        return valueList;
+    }
+
+    public boolean hasProperty(String key){
+        return keyToValue.containsKey(key.toLowerCase());
+    }
+}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
index e1cf33d..0db636f 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
@@ -8,6 +8,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import static eu.svjatoslav.sixth.core.document.Helper.*;
+import static eu.svjatoslav.sixth.core.document.Utils.isBlank;
 
 public class ListElement implements Content {
     public final FormattedText name;
@@ -15,7 +16,6 @@ public class ListElement implements Content {
     public final ListElement parent;
     private final String type;
     private final List<Content> content = new ArrayList<>();
-    StringBuilder normalTextAccumulator = new StringBuilder();
 
     public ListElement(FormattedText name, int indent, ListElement parent, String type) {
         this.indent = indent;
@@ -24,25 +24,26 @@ public class ListElement implements Content {
         this.parent = parent;
     }
 
-    public void addContent(Content content) {
-        applyTextAccumulator();
-        this.content.add(content);
+    private Content findCurrentContentElement(){
+        if (content.isEmpty()) return null;
+        return content.get(content.size()-1);
     }
 
-    private void applyTextAccumulator(){
-        if (normalTextAccumulator.length() == 0)
-            return;
+    private boolean isLastContentElement(Class aClass){
+        Content contentElement = findCurrentContentElement();
+        if (contentElement == null) return false;
 
-        content.add(new TextBlock(normalTextAccumulator.toString()));
+        return contentElement.getClass().isInstance(aClass);
+    }
 
-        normalTextAccumulator.setLength(0);
+    public void addContent(Content contentElement){
+        content.add(contentElement);
     }
 
     public void parse(TokenizerMatch tm) {
 
         if (tm.isGroup(TG_DOCUMENT_PROPERTY)) {
-            // TODO
-            // System.out.println("DOCUMENT PROPERTY!!!: " + tm.token);
+            parseDocumentProperty(tm);
             return;
         }
 
@@ -53,14 +54,19 @@ public class ListElement implements Content {
         }
 
         if (tm.isGroup(TG_NORMAL_TEXT)) {
-            normalTextAccumulator.append(tm.token);
+            if (isBlank(tm.token)){
+                parseSeparator();
+                return;
+            }
+
+            parseTextBlock(tm);
             return;
         }
 
         if (tm.isGroup(TG_MULTILINE_CODE)){
            // System.out.println(tm.toString());
             String[] groups = tm.getRegExpGroups();
-            addContent(new MultilineCode(
+            content.add(new MultilineCode(
                     groups[3], // language
                     groups[5]  // code
             ));
@@ -69,16 +75,51 @@ public class ListElement implements Content {
 
         if (tm.isGroup(TG_VERSE)){
             String[] groups = tm.getRegExpGroups();
-            addContent(new Verse(groups[5]));
+            content.add(new Verse(groups[5]));
             return;
         }
 
         System.out.println("ERROR!!!! Unable to handle: " + tm);
     }
 
+    private void parseTextBlock(TokenizerMatch tm) {
+        TextBlock textBlock;
+        if (isLastContentElement(TextBlock.class)) {
+            textBlock = ((TextBlock) findCurrentContentElement());
+        } else {
+            textBlock = new TextBlock();
+            content.add(textBlock);
+        }
+
+        textBlock.addContent(tm.token + "\n");
+    }
+
+    private void parseDocumentProperty(TokenizerMatch tm) {
+        DocumentPropertyCollection documentPropertyCollection;
+
+        if (isLastContentElement(DocumentPropertyCollection.class)){
+            documentPropertyCollection = (DocumentPropertyCollection)findCurrentContentElement();
+        } else {
+            documentPropertyCollection = new DocumentPropertyCollection();
+            content.add(documentPropertyCollection);
+        }
+
+        documentPropertyCollection.addProperty(
+                tm.getRegExpGroups()[0],
+                tm.getRegExpGroups()[1]);
+    }
+
+    private void parseSeparator() {
+        if (isLastContentElement(Separator.class)){
+            ((Separator)findCurrentContentElement()).addLine();
+        } else {
+            content.add(new Separator()); 
+        }
+    }
+
 
     public void toMD(StringBuilder sb, int indent) {
-        applyTextAccumulator();
+        disablePlantUmlExport();
 
         if (this.indent >= 0) {
             String2 s = new String2();
@@ -90,4 +131,24 @@ public class ListElement implements Content {
             c.toMD(sb, this.indent + 2);
         }
     }
+
+    private void disablePlantUmlExport() {
+
+        for (int i = 0; i< (content.size()-2); i++){
+            if (!(content.get(i) instanceof MultilineCode)) continue;
+
+            MultilineCode code = (MultilineCode) content.get(i);
+            if (!"plantuml".equalsIgnoreCase(code.language)) continue;;
+
+            if (!(content.get(i+1) instanceof DocumentPropertyCollection)) continue;
+            DocumentPropertyCollection property = (DocumentPropertyCollection) content.get(i+1);
+
+            if (!property.hasProperty("results")) continue;;
+
+            if (!(content.get(i+2) instanceof TextBlock)) continue;
+            TextBlock textBlock = (TextBlock) content.get(i+2);
+
+            textBlock.disableForExport();
+        }
+    }
 }
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
index db64e3e..212d412 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
@@ -1,13 +1,24 @@
 package eu.svjatoslav.sixth.core.document.content;
 
 import eu.svjatoslav.commons.string.String2;
+import eu.svjatoslav.commons.string.tokenizer.Tokenizer;
+
+import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.DROP;
 
 public class MultilineCode implements Content {
     public final String language;
     public final String code;
 
-    public MultilineCode(String language, String code) {
-        this.language = language;
+    public MultilineCode(String languageAndParams, String code) {
+
+        final Tokenizer tokenizer = new Tokenizer(languageAndParams);
+        tokenizer.addTerminator(DROP, "[ \\t]+", "whitespace");
+        if (tokenizer.hasMoreContent()){
+            language = tokenizer.getNextToken().token;
+        } else {
+            language = null;
+        }
+
         this.code = code;
     }
 
@@ -22,7 +33,6 @@ public class MultilineCode implements Content {
     }
 
     public String getMDlanguage(){
-        // TODO: do not append ORG parameters to language, like: file: ....
         if (language == null) return "";
         return language;
     }
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/PropertyCollection.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/PropertyCollection.java
deleted file mode 100644
index 4034670..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/PropertyCollection.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import java.util.HashMap;
-import java.util.Map;
-
-public class PropertyCollection implements Content {
-
-    private Map<String, String> propertyToValue = new HashMap<>();
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-        // TODO
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java
new file mode 100644
index 0000000..44097e9
--- /dev/null
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java
@@ -0,0 +1,20 @@
+package eu.svjatoslav.sixth.core.document.content;
+
+public class Separator implements Content {
+
+    private int numLines = 1;
+
+    public Separator(){
+    }
+
+    @Override
+    public void toMD(StringBuilder sb, int indent) {
+        for (int i = 0; i < numLines; i++) {
+            sb.append("\n");
+        }
+    }
+
+    public void addLine(){
+        numLines++;
+    }
+}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
index a3a4611..56177b6 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
@@ -3,14 +3,25 @@ package eu.svjatoslav.sixth.core.document.content;
 import eu.svjatoslav.sixth.core.document.text.FormattedText;
 
 public class TextBlock implements Content {
-    private final FormattedText text;
+    private StringBuilder orgAccumulator = new StringBuilder();
+    private boolean enabledForExport = true;
 
-    public TextBlock (String contentInOrgMarkup){
-        text = FormattedText.fromOrg(contentInOrgMarkup);
+    public TextBlock (){
+    }
+
+    public void addContent(String content){
+        orgAccumulator.append(content);
     }
 
     @Override
     public void toMD(StringBuilder sb, int indent) {
+        if (!enabledForExport) return;
+
+        FormattedText text = FormattedText.fromOrg(orgAccumulator.toString());
         sb.append(text.toMD(indent) + "\n");
     }
+
+    public void disableForExport(){
+        enabledForExport = false;
+    }
 }
-- 
2.20.1


From 168cf05300cec2bb4c0607711b752609976b2901 Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Fri, 2 Oct 2020 17:45:00 +0300
Subject: [PATCH 2/5] Misc fixes: Fixed last content element and list title
 continuation detections. Properly handle list depth decrease. Better parsing
 of multiline list title.

---
 .../sixth/core/document/Heading.java          | 55 ++++++-------------
 .../svjatoslav/sixth/core/document/Utils.java | 31 ++++++++++-
 .../core/document/content/ListElement.java    | 25 ++++++---
 3 files changed, 63 insertions(+), 48 deletions(-)

diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java b/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
index ca72321..8a80d9c 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
@@ -1,7 +1,6 @@
 package eu.svjatoslav.sixth.core.document;
 
 import eu.svjatoslav.commons.string.String2;
-import eu.svjatoslav.commons.string.tokenizer.Tokenizer;
 import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
 import eu.svjatoslav.sixth.core.document.content.ListElement;
 import eu.svjatoslav.sixth.core.document.text.FormattedText;
@@ -58,6 +57,9 @@ public class Heading {
 
     public void parse(TokenizerMatch tm){
 
+        int indent = Utils.getLineIndent(tm.token);
+        if (indent > -1 && indent <= currentListElement.indent) handleListDepthDecrease(indent);
+
         if (tm.isGroup(TG_LIST)){
             parseList(tm);
             return;
@@ -66,11 +68,22 @@ public class Heading {
         currentListElement.parse(tm);
     }
 
+    private void handleListDepthDecrease(int indent) {
+        while (true){
+            if (currentListElement.parent.indent <= indent){
+                currentListElement = currentListElement.parent;
+                return;
+            }
+            currentListElement = currentListElement.parent;
+        }
+    }
+
     private void parseList(TokenizerMatch tm) {
         String[] listSections = tm.getRegExpGroups();
         int indent = listSections[0].length();
         String type = listSections[1];
-        FormattedText title = FormattedText.fromOrg(parseFullListTitle(getPartialTitle(listSections), tm.getTokenizer(), indent));
+
+        String title = getPartialTitle(listSections);
 
         if (indent > currentListElement.indent){
             // list dept increases
@@ -88,47 +101,11 @@ public class Heading {
             return;
         }
 
-        // list dept decreases
-        while (true){
-            if (currentListElement.parent.indent <= indent){
-                ListElement newElement = new ListElement(title, indent, currentListElement.parent.parent, type);
-                currentListElement.parent.parent.addContent(newElement);
-                currentListElement = newElement;
-                return;
-            }
-            currentListElement = currentListElement.parent;
-        }
-
+        throw new RuntimeException("Impossible condition reached. Must be a bug!");
     }
 
     private String getPartialTitle(String[] listSections) {
         return listSections.length > 2 ? listSections[2] : "";
     }
 
-    private String parseFullListTitle(String partialTitle, Tokenizer tokenizer, int listIndent){
-        StringBuilder sb = new StringBuilder();
-        sb.append(partialTitle);
-
-        while (tokenizer.hasMoreContent()){
-            final TokenizerMatch tm = tokenizer.getNextToken();
-
-            if (isContentContinuation(tm, listIndent, Helper.TG_NORMAL_TEXT)){
-                String titleContinuation = tm.token.substring(listIndent).trim();
-                sb.append("\n").append(titleContinuation);
-                continue;
-            }
-
-            tokenizer.unreadToken();
-            break;
-        }
-
-        return sb.toString();
-    }
-
-    public static boolean isContentContinuation(TokenizerMatch tm, int requiredIndent, String requiredGroup) {
-        if (tm.token.length() <= requiredIndent) return false;
-
-        return tm.isGroup(requiredGroup) && tm.token.substring(0, requiredIndent +1).trim().length() == 0;
-    }
-
 }
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java b/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
index 00166ef..4883d1d 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
@@ -4,6 +4,8 @@ import eu.svjatoslav.commons.string.String2;
 
 public class Utils {
 
+    public static final char[] whitespace = new char[]{'\n', '\r', ' ', '\t'};
+
     public static String addIndentExceptFirstLine(String input, int indent) {
         String[] lines = input.split("\\r?\\n");
 
@@ -21,7 +23,34 @@ public class Utils {
     }
 
     public static boolean isBlank(String s){
-        return s.trim().length() == 0;
+        for (char c : s.toCharArray())
+            if (!isWhitespaceChar(c)) return false;
+
+        return true;
+    }
+
+    /**
+     * @return line indent in characters or -1 if line is blank or empty
+     */
+    public static int getLineIndent(String line){
+        for (int i = 0; i < line.length(); i++) {
+            if (!isWhitespaceChar(line.charAt(i)))
+                return i;
+        }
+        return -1;
+    }
+
+    public static boolean isWhitespaceChar(char c){
+        for (char whitespaceChar : whitespace)
+            if (whitespaceChar == c) return true;
+
+        return false;
+    }
+
+    public static String removePrefix(String string, int charsToRemove){
+        String2 s = new String2(string);
+        s.trimPrefix(charsToRemove);
+        return s.toString();
     }
 
 }
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
index 0db636f..5cfc791 100644
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
+++ b/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
@@ -9,17 +9,18 @@ import java.util.List;
 
 import static eu.svjatoslav.sixth.core.document.Helper.*;
 import static eu.svjatoslav.sixth.core.document.Utils.isBlank;
+import static eu.svjatoslav.sixth.core.document.Utils.removePrefix;
 
 public class ListElement implements Content {
-    public final FormattedText name;
+    StringBuilder nameInOrg = new StringBuilder();
     public final int indent;
     public final ListElement parent;
     private final String type;
     private final List<Content> content = new ArrayList<>();
 
-    public ListElement(FormattedText name, int indent, ListElement parent, String type) {
+    public ListElement(String nameInOrg, int indent, ListElement parent, String type) {
         this.indent = indent;
-        this.name = name;
+        this.nameInOrg.append(nameInOrg);
         this.type = type;
         this.parent = parent;
     }
@@ -33,7 +34,7 @@ public class ListElement implements Content {
         Content contentElement = findCurrentContentElement();
         if (contentElement == null) return false;
 
-        return contentElement.getClass().isInstance(aClass);
+        return aClass.isInstance(contentElement);
     }
 
     public void addContent(Content contentElement){
@@ -86,12 +87,16 @@ public class ListElement implements Content {
         TextBlock textBlock;
         if (isLastContentElement(TextBlock.class)) {
             textBlock = ((TextBlock) findCurrentContentElement());
+        } if (content.isEmpty()){
+            // list title continuation
+            nameInOrg.append("\n").append(removePrefix(tm.token, indent + 2));
+            return;
         } else {
             textBlock = new TextBlock();
             content.add(textBlock);
         }
 
-        textBlock.addContent(tm.token + "\n");
+        textBlock.addContent(tm.token);
     }
 
     private void parseDocumentProperty(TokenizerMatch tm) {
@@ -123,7 +128,7 @@ public class ListElement implements Content {
 
         if (this.indent >= 0) {
             String2 s = new String2();
-            s.append(" ", indent).append(type).append(" ").append(name.toMD(indent + 2)).append("\n");
+            s.append(" ", indent).append(type).append(" ").append(getName().toMD(indent + 2)).append("\n");
             sb.append(s.toString());
         }
 
@@ -132,18 +137,22 @@ public class ListElement implements Content {
         }
     }
 
+    private FormattedText getName(){
+        return FormattedText.fromOrg(nameInOrg.toString());
+    }
+
     private void disablePlantUmlExport() {
 
         for (int i = 0; i< (content.size()-2); i++){
             if (!(content.get(i) instanceof MultilineCode)) continue;
 
             MultilineCode code = (MultilineCode) content.get(i);
-            if (!"plantuml".equalsIgnoreCase(code.language)) continue;;
+            if (!"plantuml".equalsIgnoreCase(code.language)) continue;
 
             if (!(content.get(i+1) instanceof DocumentPropertyCollection)) continue;
             DocumentPropertyCollection property = (DocumentPropertyCollection) content.get(i+1);
 
-            if (!property.hasProperty("results")) continue;;
+            if (!property.hasProperty("results")) continue;
 
             if (!(content.get(i+2) instanceof TextBlock)) continue;
             TextBlock textBlock = (TextBlock) content.get(i+2);
-- 
2.20.1


From c91e7d20d9ebd423eae87eb89cc6b69caf1cb8de Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Fri, 20 Nov 2020 17:54:26 +0200
Subject: [PATCH 3/5] Moved Org Mode support to dedicated repository and
 project.

---
 .../sixth/core/document/Document.java         | 110 ------------
 .../sixth/core/document/Heading.java          | 111 ------------
 .../sixth/core/document/Helper.java           |  15 --
 .../sixth/core/document/MdGenerator.java      |  21 ---
 .../sixth/core/document/OrgParser.java        |  24 ---
 .../svjatoslav/sixth/core/document/Utils.java |  56 ------
 .../sixth/core/document/content/Content.java  |   5 -
 .../content/DocumentPropertyCollection.java   |  40 -----
 .../core/document/content/ListElement.java    | 163 ------------------
 .../core/document/content/MultilineCode.java  |  39 -----
 .../core/document/content/Separator.java      |  20 ---
 .../core/document/content/TextBlock.java      |  27 ---
 .../sixth/core/document/content/Verse.java    |  21 ---
 .../core/document/text/FormattedText.java     |  58 -------
 .../document/text/FormattedTextElement.java   |   6 -
 .../sixth/core/document/text/Hyperlink.java   |  44 -----
 .../sixth/core/document/text/PlainText.java   |  17 --
 17 files changed, 777 deletions(-)
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/Document.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/Helper.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/MdGenerator.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/OrgParser.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/Content.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/content/Verse.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedText.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedTextElement.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/text/Hyperlink.java
 delete mode 100644 src/main/java/eu/svjatoslav/sixth/core/document/text/PlainText.java

diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Document.java b/src/main/java/eu/svjatoslav/sixth/core/document/Document.java
deleted file mode 100644
index c61d613..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Document.java
+++ /dev/null
@@ -1,110 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-import eu.svjatoslav.commons.string.tokenizer.InvalidSyntaxException;
-import eu.svjatoslav.commons.string.tokenizer.Tokenizer;
-import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
-import eu.svjatoslav.sixth.core.document.text.FormattedText;
-
-import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.PRESERVE;
-import static eu.svjatoslav.sixth.core.document.Helper.*;
-import static eu.svjatoslav.sixth.core.document.text.FormattedText.fromOrg;
-
-public class Document {
-    public final Heading rootHeading = new Heading( null , 0, null);
-    private Heading currentHeading = rootHeading;
-
-    public Heading createHeading(FormattedText name, int targetLevel){
-        if (currentHeading.level == (targetLevel - 1)){
-            Heading newHeading = new Heading(name, targetLevel, currentHeading);
-            currentHeading.addChild(newHeading);
-            currentHeading = newHeading;
-            return newHeading;
-        }
-
-        if (currentHeading.level > (targetLevel - 1)){
-            currentHeading = currentHeading.parent;
-            return createHeading(name, targetLevel);
-        }
-
-        Heading missingIntermediate = new Heading(fromOrg("<noname>"), currentHeading.level + 1, currentHeading);
-        currentHeading.addChild(missingIntermediate);
-        currentHeading = missingIntermediate;
-        return createHeading(name, targetLevel);
-    }
-
-    public Heading getCurrentHeading(){
-        return currentHeading;
-    }
-
-    private void parseHeading(TokenizerMatch token) throws InvalidSyntaxException {
-        String[] headingSections = token.getRegExpGroups();
-        int level = headingSections[0].length();
-        String title = headingSections[1];
-        createHeading(fromOrg(title), level);
-    }
-
-    public void parse(String fileContentsAsString) throws InvalidSyntaxException {
-        final Tokenizer tokenizer = new Tokenizer(fileContentsAsString);
-
-        // Org heading:
-        // "*** Example Heading 1234"
-        tokenizer.addTerminator(PRESERVE, "(\\*+)[ \\t](.*)\\r?\\n", TG_HEADING);
-
-        // Org list. Examples:
-        // "   + my list title"
-        // "   - my list title"
-        tokenizer.addTerminator(PRESERVE, "([ \\t]*)(\\+|-)[ \\t]+(.*)?\\r?\\n", TG_LIST);
-
-        // "   * my list title"
-        tokenizer.addTerminator(PRESERVE, "([ \\t]+)(\\*)[ \\t]+(.*)?\\r?\\n", TG_LIST);
-
-        // TODO: add numbered list
-
-        // DocumentProperty:
-        // "#+OPTIONS: H:20 num:20"
-        tokenizer.addTerminator(PRESERVE, "#\\+([^\\s]+):(.*)\\r?\\n", TG_DOCUMENT_PROPERTY);
-
-        // Drawer property:
-        //  " :ID:       533734b9-0456-4448-9830-a43646345615"
-        tokenizer.addTerminator(PRESERVE, "([ \\t]*):([^\\s]+):(.*)\\r?\\n", TG_DRAWER_PROPERTY);
-
-
-        // multiline code block
-        tokenizer.addTerminator(PRESERVE,
-                "([ \\t]*)#\\+BEGIN_SRC" +  // source begin identifier
-                        "(([ \\t]+)(.*))?(\\r?\\n)" + // source block parameters
-                        "((?:.|\\n|\\r)*?)" + // source content
-                        "(\\r?\\n)([ \\t]*)#\\+END_SRC(.*)\\r?\\n" // source end identifier
-                , TG_MULTILINE_CODE);
-
-        // verse
-        tokenizer.addTerminator(PRESERVE,
-                "([ \\t]*)#\\+BEGIN_VERSE" + // verse begin identifier
-                        "(([ \\t]+)(.*))?(\\r?\\n)" + // verse block parameters
-                        "((?:.|\\n|\\r)*?)" + // verse
-                        "(\\r?\\n)([ \\t]*)#\\+END_VERSE(.*)\\r?\\n" // verse end identifier
-                , TG_VERSE);
-
-
-        // TODO: add support for export blocks:
-        //        #+begin_export latex
-        //  \clearpage
-        //#+end_export
-
-
-        // normal text
-        tokenizer.addTerminator(PRESERVE,".*\\r?\\n", TG_NORMAL_TEXT);
-
-        while (tokenizer.hasMoreContent()) {
-            final TokenizerMatch tm = tokenizer.getNextToken();
-
-            if (tm.isGroup(TG_HEADING)){
-                parseHeading(tm);
-                continue;
-            }
-
-            currentHeading.parse(tm);
-        }
-
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java b/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
deleted file mode 100644
index 8a80d9c..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Heading.java
+++ /dev/null
@@ -1,111 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-import eu.svjatoslav.commons.string.String2;
-import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
-import eu.svjatoslav.sixth.core.document.content.ListElement;
-import eu.svjatoslav.sixth.core.document.text.FormattedText;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import static eu.svjatoslav.sixth.core.document.Helper.TG_LIST;
-
-public class Heading {
-    public final FormattedText name;
-    public final int level;
-    public final Heading parent;
-    private final List<Heading> children = new ArrayList<>();
-
-    public final ListElement rootListElement = new ListElement(null, -2, null, "");
-    private ListElement currentListElement = rootListElement;
-
-    public Heading(FormattedText name, int level, Heading parent){
-        this.level = level;
-        this.name = name;
-        this.parent = parent;
-    }
-
-    public void addChild(Heading heading){
-        children.add(heading);
-    }
-
-    public List<Heading> getChildren(){
-        return children;
-    }
-
-    public String toMD () {
-        StringBuilder sb = new StringBuilder();
-
-        if (level > 0) sb.append(enlistTitleInMD());
-
-        rootListElement.toMD(sb, -2);
-
-        children.stream().map(Heading::toMD).forEach(sb::append);
-
-        return sb.toString();
-    }
-
-    private String enlistTitleInMD() {
-        String2 s = new String2();
-        s.append("#", level).append(" ").append(name.toMD(0)).append("\n");
-        return s.toString();
-    }
-
-    public ListElement getCurrentHeading(){
-        return currentListElement;
-    }
-
-    public void parse(TokenizerMatch tm){
-
-        int indent = Utils.getLineIndent(tm.token);
-        if (indent > -1 && indent <= currentListElement.indent) handleListDepthDecrease(indent);
-
-        if (tm.isGroup(TG_LIST)){
-            parseList(tm);
-            return;
-        }
-
-        currentListElement.parse(tm);
-    }
-
-    private void handleListDepthDecrease(int indent) {
-        while (true){
-            if (currentListElement.parent.indent <= indent){
-                currentListElement = currentListElement.parent;
-                return;
-            }
-            currentListElement = currentListElement.parent;
-        }
-    }
-
-    private void parseList(TokenizerMatch tm) {
-        String[] listSections = tm.getRegExpGroups();
-        int indent = listSections[0].length();
-        String type = listSections[1];
-
-        String title = getPartialTitle(listSections);
-
-        if (indent > currentListElement.indent){
-            // list dept increases
-            ListElement newElement = new ListElement(title, indent, currentListElement, type);
-            currentListElement.addContent(newElement);
-            currentListElement = newElement;
-            return;
-        }
-
-        if (indent > currentListElement.parent.indent){
-            // list depth is the same
-            ListElement newElement = new ListElement(title, indent, currentListElement.parent, type);
-            currentListElement.parent.addContent(newElement);
-            currentListElement = newElement;
-            return;
-        }
-
-        throw new RuntimeException("Impossible condition reached. Must be a bug!");
-    }
-
-    private String getPartialTitle(String[] listSections) {
-        return listSections.length > 2 ? listSections[2] : "";
-    }
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Helper.java b/src/main/java/eu/svjatoslav/sixth/core/document/Helper.java
deleted file mode 100644
index 7ae3274..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Helper.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-public class Helper {
-
-    public static final String TG_NORMAL_TEXT = "normaltext";
-    public static final String TG_MULTILINE_CODE = "multiline code";
-    public static final String TG_VERSE = "verse";
-    public static final String TG_HYPERLINK = "hyperlink";
-    public static final String TG_HEADING = "heading";
-    public static final String TG_LIST = "list";
-
-    public static final String TG_DOCUMENT_PROPERTY = "document property";
-    public static final String TG_DRAWER_PROPERTY = "drawer property";
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/MdGenerator.java b/src/main/java/eu/svjatoslav/sixth/core/document/MdGenerator.java
deleted file mode 100644
index fbc8320..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/MdGenerator.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-import java.io.File;
-import java.io.IOException;
-
-import static eu.svjatoslav.commons.file.IOHelper.saveToFile;
-
-public class MdGenerator {
-
-    private StringBuilder sb;
-
-    public void generate(Document document, File file) throws IOException {
-        sb = new StringBuilder();
-
-        sb.append(document.rootHeading.toMD());
-
-        saveToFile(file, sb.toString());
-    }
-
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/OrgParser.java b/src/main/java/eu/svjatoslav/sixth/core/document/OrgParser.java
deleted file mode 100644
index 8822d21..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/OrgParser.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-import eu.svjatoslav.commons.string.tokenizer.InvalidSyntaxException;
-
-import java.io.File;
-import java.io.IOException;
-
-import static eu.svjatoslav.commons.file.IOHelper.getFileContentsAsString;
-
-public class OrgParser {
-
-    private Document document;
-
-    public Document parse(File file) throws IOException, InvalidSyntaxException {
-        document = new Document();
-
-        String fileContentsAsString = getFileContentsAsString(file);
-
-        document.parse(fileContentsAsString);
-
-        return document;
-    }
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java b/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
deleted file mode 100644
index 4883d1d..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/Utils.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package eu.svjatoslav.sixth.core.document;
-
-import eu.svjatoslav.commons.string.String2;
-
-public class Utils {
-
-    public static final char[] whitespace = new char[]{'\n', '\r', ' ', '\t'};
-
-    public static String addIndentExceptFirstLine(String input, int indent) {
-        String[] lines = input.split("\\r?\\n");
-
-        StringBuilder sb = new StringBuilder();
-
-        if (lines.length >0 ) sb.append(lines[0]);
-
-        for (int i = 1; i< lines.length; i++) {
-            sb.append("\n");
-            sb.append(new String2(" ").repeat(indent).toString());
-            sb.append(lines[i]);
-        }
-
-        return sb.toString();
-    }
-
-    public static boolean isBlank(String s){
-        for (char c : s.toCharArray())
-            if (!isWhitespaceChar(c)) return false;
-
-        return true;
-    }
-
-    /**
-     * @return line indent in characters or -1 if line is blank or empty
-     */
-    public static int getLineIndent(String line){
-        for (int i = 0; i < line.length(); i++) {
-            if (!isWhitespaceChar(line.charAt(i)))
-                return i;
-        }
-        return -1;
-    }
-
-    public static boolean isWhitespaceChar(char c){
-        for (char whitespaceChar : whitespace)
-            if (whitespaceChar == c) return true;
-
-        return false;
-    }
-
-    public static String removePrefix(String string, int charsToRemove){
-        String2 s = new String2(string);
-        s.trimPrefix(charsToRemove);
-        return s.toString();
-    }
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/Content.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/Content.java
deleted file mode 100644
index 1dad36c..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/Content.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-public interface Content {
-    void toMD(StringBuilder sb, int indent);
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
deleted file mode 100644
index adb3c12..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/DocumentPropertyCollection.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-/**
- * Things like:
- * #+RESULTS:
- * #+LATEX_HEADER: \\usepackage{parskip}
- * #+OPTIONS: H:20 num:20
- * #+attr_latex: :width 300px
- */
-
-public class DocumentPropertyCollection implements Content {
-    private Map<String, List<String>> keyToValue = new HashMap<>();
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-    }
-
-    public void addProperty(String key, String value){
-        getOrCreateValueList(key).add(value);
-    }
-
-    private List<String> getOrCreateValueList(String key){
-        String actualKey = key.toLowerCase();
-        if (keyToValue.containsKey(actualKey))
-            return keyToValue.get(actualKey);
-
-        List valueList = new ArrayList<String>();
-        keyToValue.put(actualKey, valueList);
-        return valueList;
-    }
-
-    public boolean hasProperty(String key){
-        return keyToValue.containsKey(key.toLowerCase());
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
deleted file mode 100644
index 5cfc791..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/ListElement.java
+++ /dev/null
@@ -1,163 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import eu.svjatoslav.commons.string.String2;
-import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
-import eu.svjatoslav.sixth.core.document.text.FormattedText;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import static eu.svjatoslav.sixth.core.document.Helper.*;
-import static eu.svjatoslav.sixth.core.document.Utils.isBlank;
-import static eu.svjatoslav.sixth.core.document.Utils.removePrefix;
-
-public class ListElement implements Content {
-    StringBuilder nameInOrg = new StringBuilder();
-    public final int indent;
-    public final ListElement parent;
-    private final String type;
-    private final List<Content> content = new ArrayList<>();
-
-    public ListElement(String nameInOrg, int indent, ListElement parent, String type) {
-        this.indent = indent;
-        this.nameInOrg.append(nameInOrg);
-        this.type = type;
-        this.parent = parent;
-    }
-
-    private Content findCurrentContentElement(){
-        if (content.isEmpty()) return null;
-        return content.get(content.size()-1);
-    }
-
-    private boolean isLastContentElement(Class aClass){
-        Content contentElement = findCurrentContentElement();
-        if (contentElement == null) return false;
-
-        return aClass.isInstance(contentElement);
-    }
-
-    public void addContent(Content contentElement){
-        content.add(contentElement);
-    }
-
-    public void parse(TokenizerMatch tm) {
-
-        if (tm.isGroup(TG_DOCUMENT_PROPERTY)) {
-            parseDocumentProperty(tm);
-            return;
-        }
-
-        if (tm.isGroup(TG_DRAWER_PROPERTY)) {
-            // TODO
-            // System.out.println("DOCUMENT PROPERTY!!!: " + tm.token);
-            return;
-        }
-
-        if (tm.isGroup(TG_NORMAL_TEXT)) {
-            if (isBlank(tm.token)){
-                parseSeparator();
-                return;
-            }
-
-            parseTextBlock(tm);
-            return;
-        }
-
-        if (tm.isGroup(TG_MULTILINE_CODE)){
-           // System.out.println(tm.toString());
-            String[] groups = tm.getRegExpGroups();
-            content.add(new MultilineCode(
-                    groups[3], // language
-                    groups[5]  // code
-            ));
-            return;
-        }
-
-        if (tm.isGroup(TG_VERSE)){
-            String[] groups = tm.getRegExpGroups();
-            content.add(new Verse(groups[5]));
-            return;
-        }
-
-        System.out.println("ERROR!!!! Unable to handle: " + tm);
-    }
-
-    private void parseTextBlock(TokenizerMatch tm) {
-        TextBlock textBlock;
-        if (isLastContentElement(TextBlock.class)) {
-            textBlock = ((TextBlock) findCurrentContentElement());
-        } if (content.isEmpty()){
-            // list title continuation
-            nameInOrg.append("\n").append(removePrefix(tm.token, indent + 2));
-            return;
-        } else {
-            textBlock = new TextBlock();
-            content.add(textBlock);
-        }
-
-        textBlock.addContent(tm.token);
-    }
-
-    private void parseDocumentProperty(TokenizerMatch tm) {
-        DocumentPropertyCollection documentPropertyCollection;
-
-        if (isLastContentElement(DocumentPropertyCollection.class)){
-            documentPropertyCollection = (DocumentPropertyCollection)findCurrentContentElement();
-        } else {
-            documentPropertyCollection = new DocumentPropertyCollection();
-            content.add(documentPropertyCollection);
-        }
-
-        documentPropertyCollection.addProperty(
-                tm.getRegExpGroups()[0],
-                tm.getRegExpGroups()[1]);
-    }
-
-    private void parseSeparator() {
-        if (isLastContentElement(Separator.class)){
-            ((Separator)findCurrentContentElement()).addLine();
-        } else {
-            content.add(new Separator()); 
-        }
-    }
-
-
-    public void toMD(StringBuilder sb, int indent) {
-        disablePlantUmlExport();
-
-        if (this.indent >= 0) {
-            String2 s = new String2();
-            s.append(" ", indent).append(type).append(" ").append(getName().toMD(indent + 2)).append("\n");
-            sb.append(s.toString());
-        }
-
-        for (Content c : content) {
-            c.toMD(sb, this.indent + 2);
-        }
-    }
-
-    private FormattedText getName(){
-        return FormattedText.fromOrg(nameInOrg.toString());
-    }
-
-    private void disablePlantUmlExport() {
-
-        for (int i = 0; i< (content.size()-2); i++){
-            if (!(content.get(i) instanceof MultilineCode)) continue;
-
-            MultilineCode code = (MultilineCode) content.get(i);
-            if (!"plantuml".equalsIgnoreCase(code.language)) continue;
-
-            if (!(content.get(i+1) instanceof DocumentPropertyCollection)) continue;
-            DocumentPropertyCollection property = (DocumentPropertyCollection) content.get(i+1);
-
-            if (!property.hasProperty("results")) continue;
-
-            if (!(content.get(i+2) instanceof TextBlock)) continue;
-            TextBlock textBlock = (TextBlock) content.get(i+2);
-
-            textBlock.disableForExport();
-        }
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
deleted file mode 100644
index 212d412..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/MultilineCode.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import eu.svjatoslav.commons.string.String2;
-import eu.svjatoslav.commons.string.tokenizer.Tokenizer;
-
-import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.DROP;
-
-public class MultilineCode implements Content {
-    public final String language;
-    public final String code;
-
-    public MultilineCode(String languageAndParams, String code) {
-
-        final Tokenizer tokenizer = new Tokenizer(languageAndParams);
-        tokenizer.addTerminator(DROP, "[ \\t]+", "whitespace");
-        if (tokenizer.hasMoreContent()){
-            language = tokenizer.getNextToken().token;
-        } else {
-            language = null;
-        }
-
-        this.code = code;
-    }
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-        String2 s = new String2();
-        s.append(" ", indent).append("```" + getMDlanguage() + "\n");
-        // TODO: ensure that required indent is present
-        s.append(code + "\n");
-        s.append(" ", indent).append("```\n");
-        sb.append(s.toString());
-    }
-
-    public String getMDlanguage(){
-        if (language == null) return "";
-        return language;
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java
deleted file mode 100644
index 44097e9..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/Separator.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-public class Separator implements Content {
-
-    private int numLines = 1;
-
-    public Separator(){
-    }
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-        for (int i = 0; i < numLines; i++) {
-            sb.append("\n");
-        }
-    }
-
-    public void addLine(){
-        numLines++;
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
deleted file mode 100644
index 56177b6..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/TextBlock.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import eu.svjatoslav.sixth.core.document.text.FormattedText;
-
-public class TextBlock implements Content {
-    private StringBuilder orgAccumulator = new StringBuilder();
-    private boolean enabledForExport = true;
-
-    public TextBlock (){
-    }
-
-    public void addContent(String content){
-        orgAccumulator.append(content);
-    }
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-        if (!enabledForExport) return;
-
-        FormattedText text = FormattedText.fromOrg(orgAccumulator.toString());
-        sb.append(text.toMD(indent) + "\n");
-    }
-
-    public void disableForExport(){
-        enabledForExport = false;
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/content/Verse.java b/src/main/java/eu/svjatoslav/sixth/core/document/content/Verse.java
deleted file mode 100644
index 9c62af7..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/content/Verse.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package eu.svjatoslav.sixth.core.document.content;
-
-import eu.svjatoslav.commons.string.String2;
-
-public class Verse implements Content {
-    public final String verse;
-
-    public Verse(String verse) {
-        this.verse = verse;
-    }
-
-    @Override
-    public void toMD(StringBuilder sb, int indent) {
-        String2 s = new String2();
-        s.append(" ", indent).append("```\n");
-        // TODO: ensure that required indent is present
-        s.append(verse + "\n");
-        s.append(" ", indent).append("```\n");
-        sb.append(s.toString());
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedText.java b/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedText.java
deleted file mode 100644
index 350abf3..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedText.java
+++ /dev/null
@@ -1,58 +0,0 @@
-package eu.svjatoslav.sixth.core.document.text;
-
-import eu.svjatoslav.commons.string.tokenizer.Tokenizer;
-import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import static eu.svjatoslav.sixth.core.document.Helper.TG_HYPERLINK;
-import static eu.svjatoslav.sixth.core.document.Utils.addIndentExceptFirstLine;
-
-public class FormattedText {
-    List<FormattedTextElement> elements = new ArrayList<>();
-
-    public void parseOrgSyntax(String orgText) {
-
-        Tokenizer tokenizer = getTokenizer(orgText);
-        while (tokenizer.hasMoreContent()) {
-            final TokenizerMatch token = tokenizer.getNextToken();
-
-            if (token.isGroup(TG_HYPERLINK)){
-                elements.add(Hyperlink.fromOrg(token));
-                continue;
-            }
-
-            PlainText plainText = new PlainText(token.token);
-            elements.add(plainText);
-        }
-
-    }
-
-    public static FormattedText fromOrg(String orgText){
-        FormattedText formattedText = new FormattedText();
-        formattedText.parseOrgSyntax(orgText);
-        return formattedText;
-    }
-
-    public String toMD(int indent){
-        StringBuilder sb = new StringBuilder();
-
-        for (FormattedTextElement element : elements)
-            sb.append(element.toMD());
-
-        return addIndentExceptFirstLine(sb.toString(), indent);
-    }
-
-    private Tokenizer getTokenizer(String contents) {
-        final Tokenizer tokenizer = new Tokenizer(contents);
-        tokenizer.addTerminator(Hyperlink.orgTerminator);
-        tokenizer.addTerminator(Hyperlink.orgTerminator2);
-        return tokenizer;
-    }
-
-
-    public String toString(){
-        return toMD(0);
-    }
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedTextElement.java b/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedTextElement.java
deleted file mode 100644
index 9a17ce0..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/text/FormattedTextElement.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package eu.svjatoslav.sixth.core.document.text;
-
-public interface FormattedTextElement {
-    String toMD();
-}
-
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/text/Hyperlink.java b/src/main/java/eu/svjatoslav/sixth/core/document/text/Hyperlink.java
deleted file mode 100644
index 508003c..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/text/Hyperlink.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package eu.svjatoslav.sixth.core.document.text;
-
-import eu.svjatoslav.commons.string.tokenizer.Terminator;
-import eu.svjatoslav.commons.string.tokenizer.TokenizerMatch;
-
-import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.PRESERVE;
-import static eu.svjatoslav.sixth.core.document.Helper.TG_HYPERLINK;
-
-public class Hyperlink implements FormattedTextElement {
-
-    public static final Terminator orgTerminator =
-            new Terminator(PRESERVE, "\\[\\[([\\s\\S]+)\\][ \\t\\r\\n]*\\[([\\s\\S]+)\\]\\]", TG_HYPERLINK);
-
-        public static final Terminator orgTerminator2 =
-            new Terminator(PRESERVE, "\\[\\[([\\s\\S]+)\\]\\]", TG_HYPERLINK);
-
-    private String label;
-    private String URL;
-
-    @Override
-    public String toMD() {
-
-        if (URL.startsWith("id:"))
-            return label; // TODO
-
-        return  "[" + label + "]("+ URL + ")";
-    }
-
-    public static Hyperlink fromOrg(TokenizerMatch tokenizerMatch) {
-        Hyperlink hyperlink = new Hyperlink();
-        hyperlink.parseOrg(tokenizerMatch);
-        return hyperlink;
-    }
-
-    private void parseOrg(TokenizerMatch tokenizerMatch) {
-        String[] regExpGroups = tokenizerMatch.getRegExpGroups();
-        URL = regExpGroups[0];
-        if (tokenizerMatch.terminator == orgTerminator){
-            label = regExpGroups[1];
-        }
-
-    }
-
-}
diff --git a/src/main/java/eu/svjatoslav/sixth/core/document/text/PlainText.java b/src/main/java/eu/svjatoslav/sixth/core/document/text/PlainText.java
deleted file mode 100644
index b025248..0000000
--- a/src/main/java/eu/svjatoslav/sixth/core/document/text/PlainText.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package eu.svjatoslav.sixth.core.document.text;
-
-public class PlainText implements FormattedTextElement {
-
-    private String content;
-
-    public PlainText(String content){
-        this.content = content;
-    }
-
-    @Override
-    public String toMD() {
-        return content;
-    }
-}
-
-
-- 
2.20.1


From 73e6624b6127a89f3f17decf102222b6fbcd023b Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Sun, 20 Dec 2020 19:31:55 +0200
Subject: [PATCH 4/5] Use alternative user name for git SCM

---
 pom.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pom.xml b/pom.xml
index e8e9fea..9ffdb0e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -116,8 +116,8 @@
     </repositories>
 
     <scm>
-        <connection>scm:git:ssh://git@svjatoslav.eu/home/git/repositories/sixth.git</connection>
-        <developerConnection>scm:git:ssh://git@svjatoslav.eu/home/git/repositories/sixth.git</developerConnection>
+        <connection>scm:git:ssh://n0@svjatoslav.eu/home/git/repositories/sixth.git</connection>
+        <developerConnection>scm:git:ssh://n0@svjatoslav.eu/home/git/repositories/sixth.git</developerConnection>
     </scm>
 
 
-- 
2.20.1


From 919302c645e808b73bfc096f92174dc2f4e5e95e Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Sun, 30 Oct 2022 12:27:40 +0200
Subject: [PATCH 5/5] Added mentions for interesting projects

---
 doc/index.html | 648 +++++++++++++++++++++++++++----------------------
 doc/index.org  |  41 ++++
 2 files changed, 393 insertions(+), 296 deletions(-)

diff --git a/doc/index.html b/doc/index.html
index 6700642..168dd1e 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -1,12 +1,198 @@
-<!doctype html>
-<html lang="en">
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
 <head>
+<!-- 2022-10-30 Sun 12:26 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
 <title>Sixth - system for data storage, computation, exploration and interaction</title>
-<!-- 2020-04-20 Mon 22:24 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
+<meta name="author" content="Svjatoslav Agejenko" />
+<meta name="generator" content="Org Mode" />
+<style>
+  #content { max-width: 60em; margin: auto; }
+  .title  { text-align: center;
+             margin-bottom: .2em; }
+  .subtitle { text-align: center;
+              font-size: medium;
+              font-weight: bold;
+              margin-top:0; }
+  .todo   { font-family: monospace; color: red; }
+  .done   { font-family: monospace; color: green; }
+  .priority { font-family: monospace; color: orange; }
+  .tag    { background-color: #eee; font-family: monospace;
+            padding: 2px; font-size: 80%; font-weight: normal; }
+  .timestamp { color: #bebebe; }
+  .timestamp-kwd { color: #5f9ea0; }
+  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
+  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
+  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+  .underline { text-decoration: underline; }
+  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+  p.verse { margin-left: 3%; }
+  pre {
+    border: 1px solid #e6e6e6;
+    border-radius: 3px;
+    background-color: #f2f2f2;
+    padding: 8pt;
+    font-family: monospace;
+    overflow: auto;
+    margin: 1.2em;
+  }
+  pre.src {
+    position: relative;
+    overflow: auto;
+  }
+  pre.src:before {
+    display: none;
+    position: absolute;
+    top: -8px;
+    right: 12px;
+    padding: 3px;
+    color: #555;
+    background-color: #f2f2f299;
+  }
+  pre.src:hover:before { display: inline; margin-top: 14px;}
+  /* Languages per Org manual */
+  pre.src-asymptote:before { content: 'Asymptote'; }
+  pre.src-awk:before { content: 'Awk'; }
+  pre.src-authinfo::before { content: 'Authinfo'; }
+  pre.src-C:before { content: 'C'; }
+  /* pre.src-C++ doesn't work in CSS */
+  pre.src-clojure:before { content: 'Clojure'; }
+  pre.src-css:before { content: 'CSS'; }
+  pre.src-D:before { content: 'D'; }
+  pre.src-ditaa:before { content: 'ditaa'; }
+  pre.src-dot:before { content: 'Graphviz'; }
+  pre.src-calc:before { content: 'Emacs Calc'; }
+  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+  pre.src-fortran:before { content: 'Fortran'; }
+  pre.src-gnuplot:before { content: 'gnuplot'; }
+  pre.src-haskell:before { content: 'Haskell'; }
+  pre.src-hledger:before { content: 'hledger'; }
+  pre.src-java:before { content: 'Java'; }
+  pre.src-js:before { content: 'Javascript'; }
+  pre.src-latex:before { content: 'LaTeX'; }
+  pre.src-ledger:before { content: 'Ledger'; }
+  pre.src-lisp:before { content: 'Lisp'; }
+  pre.src-lilypond:before { content: 'Lilypond'; }
+  pre.src-lua:before { content: 'Lua'; }
+  pre.src-matlab:before { content: 'MATLAB'; }
+  pre.src-mscgen:before { content: 'Mscgen'; }
+  pre.src-ocaml:before { content: 'Objective Caml'; }
+  pre.src-octave:before { content: 'Octave'; }
+  pre.src-org:before { content: 'Org mode'; }
+  pre.src-oz:before { content: 'OZ'; }
+  pre.src-plantuml:before { content: 'Plantuml'; }
+  pre.src-processing:before { content: 'Processing.js'; }
+  pre.src-python:before { content: 'Python'; }
+  pre.src-R:before { content: 'R'; }
+  pre.src-ruby:before { content: 'Ruby'; }
+  pre.src-sass:before { content: 'Sass'; }
+  pre.src-scheme:before { content: 'Scheme'; }
+  pre.src-screen:before { content: 'Gnu Screen'; }
+  pre.src-sed:before { content: 'Sed'; }
+  pre.src-sh:before { content: 'shell'; }
+  pre.src-sql:before { content: 'SQL'; }
+  pre.src-sqlite:before { content: 'SQLite'; }
+  /* additional languages in org.el's org-babel-load-languages alist */
+  pre.src-forth:before { content: 'Forth'; }
+  pre.src-io:before { content: 'IO'; }
+  pre.src-J:before { content: 'J'; }
+  pre.src-makefile:before { content: 'Makefile'; }
+  pre.src-maxima:before { content: 'Maxima'; }
+  pre.src-perl:before { content: 'Perl'; }
+  pre.src-picolisp:before { content: 'Pico Lisp'; }
+  pre.src-scala:before { content: 'Scala'; }
+  pre.src-shell:before { content: 'Shell Script'; }
+  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+  /* additional language identifiers per "defun org-babel-execute"
+       in ob-*.el */
+  pre.src-cpp:before  { content: 'C++'; }
+  pre.src-abc:before  { content: 'ABC'; }
+  pre.src-coq:before  { content: 'Coq'; }
+  pre.src-groovy:before  { content: 'Groovy'; }
+  /* additional language identifiers from org-babel-shell-names in
+     ob-shell.el: ob-shell is the only babel language using a lambda to put
+     the execution function name together. */
+  pre.src-bash:before  { content: 'bash'; }
+  pre.src-csh:before  { content: 'csh'; }
+  pre.src-ash:before  { content: 'ash'; }
+  pre.src-dash:before  { content: 'dash'; }
+  pre.src-ksh:before  { content: 'ksh'; }
+  pre.src-mksh:before  { content: 'mksh'; }
+  pre.src-posh:before  { content: 'posh'; }
+  /* Additional Emacs modes also supported by the LaTeX listings package */
+  pre.src-ada:before { content: 'Ada'; }
+  pre.src-asm:before { content: 'Assembler'; }
+  pre.src-caml:before { content: 'Caml'; }
+  pre.src-delphi:before { content: 'Delphi'; }
+  pre.src-html:before { content: 'HTML'; }
+  pre.src-idl:before { content: 'IDL'; }
+  pre.src-mercury:before { content: 'Mercury'; }
+  pre.src-metapost:before { content: 'MetaPost'; }
+  pre.src-modula-2:before { content: 'Modula-2'; }
+  pre.src-pascal:before { content: 'Pascal'; }
+  pre.src-ps:before { content: 'PostScript'; }
+  pre.src-prolog:before { content: 'Prolog'; }
+  pre.src-simula:before { content: 'Simula'; }
+  pre.src-tcl:before { content: 'tcl'; }
+  pre.src-tex:before { content: 'TeX'; }
+  pre.src-plain-tex:before { content: 'Plain TeX'; }
+  pre.src-verilog:before { content: 'Verilog'; }
+  pre.src-vhdl:before { content: 'VHDL'; }
+  pre.src-xml:before { content: 'XML'; }
+  pre.src-nxml:before { content: 'XML'; }
+  /* add a generic configuration mode; LaTeX export needs an additional
+     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
+  pre.src-conf:before { content: 'Configuration File'; }
+
+  table { border-collapse:collapse; }
+  caption.t-above { caption-side: top; }
+  caption.t-bottom { caption-side: bottom; }
+  td, th { vertical-align:top;  }
+  th.org-right  { text-align: center;  }
+  th.org-left   { text-align: center;   }
+  th.org-center { text-align: center; }
+  td.org-right  { text-align: right;  }
+  td.org-left   { text-align: left;   }
+  td.org-center { text-align: center; }
+  dt { font-weight: bold; }
+  .footpara { display: inline; }
+  .footdef  { margin-bottom: 1em; }
+  .figure { padding: 1em; }
+  .figure p { text-align: center; }
+  .equation-container {
+    display: table;
+    text-align: center;
+    width: 100%;
+  }
+  .equation {
+    vertical-align: middle;
+  }
+  .equation-label {
+    display: table-cell;
+    text-align: right;
+    vertical-align: middle;
+  }
+  .inlinetask {
+    padding: 10px;
+    border: 2px solid gray;
+    margin: 10px;
+    background: #ffffcc;
+  }
+  #org-div-home-and-up
+   { text-align: right; font-size: 70%; white-space: nowrap; }
+  textarea { overflow-x: auto; }
+  .linenr { font-size: smaller }
+  .code-highlighted { background-color: #ffff00; }
+  .org-info-js_info-navigation { border-style: none; }
+  #org-info-js_console-label
+    { font-size: 10px; font-weight: bold; white-space: nowrap; }
+  .org-info-js_search-highlight
+    { background-color: #ffff00; color: #000000; font-weight: bold; }
+  .org-svg { }
+</style>
 <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
@@ -14,239 +200,79 @@
 footer {background-color: #111 !important;}
 pre {background-color: #111; color: #ccc;}
 </style>
-<style type="text/css">
-/* org mode styles on top of twbs */
-
-html {
-    position: relative;
-    min-height: 100%;
-}
-
-body {
-    font-size: 18px;
-    margin-bottom: 105px;
-}
-
-footer {
-    position: absolute;
-    bottom: 0;
-    width: 100%;
-    height: 101px;
-    background-color: #f5f5f5;
-}
-
-footer > div {
-    padding: 10px;
-}
-
-footer p {
-    margin: 0 0 5px;
-    text-align: center;
-    font-size: 16px;
-}
-
-#table-of-contents {
-    margin-top: 20px;
-    margin-bottom: 20px;
-}
-
-blockquote p {
-    font-size: 18px;
-}
-
-pre {
-    font-size: 16px;
-}
-
-.footpara {
-    display: inline-block;
-}
-
-figcaption {
-  font-size: 16px;
-  color: #666;
-  font-style: italic;
-  padding-bottom: 15px;
-}
-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
-    position: static;
-}
-@media (min-width: 768px) {
-    .bs-docs-sidebar {
-        padding-left: 20px;
-    }
-}
-
-/* All levels of nav */
-.bs-docs-sidebar .nav > li > a {
-    display: block;
-    padding: 4px 20px;
-    font-size: 14px;
-    font-weight: 500;
-    color: #999;
-}
-.bs-docs-sidebar .nav > li > a:hover,
-.bs-docs-sidebar .nav > li > a:focus {
-    padding-left: 19px;
-    color: #A1283B;
-    text-decoration: none;
-    background-color: transparent;
-    border-left: 1px solid #A1283B;
-}
-.bs-docs-sidebar .nav > .active > a,
-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
-    padding-left: 18px;
-    font-weight: bold;
-    color: #A1283B;
-    background-color: transparent;
-    border-left: 2px solid #A1283B;
-}
-
-/* Nav: second level (shown on .active) */
-.bs-docs-sidebar .nav .nav {
-    display: none; /* Hide by default, but at >768px, show it */
-    padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav > li > a {
-    padding-top: 1px;
-    padding-bottom: 1px;
-    padding-left: 30px;
-    font-size: 12px;
-    font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav > li > a:focus {
-    padding-left: 29px;
-}
-.bs-docs-sidebar .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav > .active:focus > a {
-    padding-left: 28px;
-    font-weight: 500;
-}
-
-/* Nav: third level (shown on .active) */
-.bs-docs-sidebar .nav .nav .nav {
-    padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a {
-    padding-top: 1px;
-    padding-bottom: 1px;
-    padding-left: 40px;
-    font-size: 12px;
-    font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav .nav > li > a:focus {
-    padding-left: 39px;
-}
-.bs-docs-sidebar .nav .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
-    padding-left: 38px;
-    font-weight: 500;
-}
-
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
-    .bs-docs-sidebar .nav > .active > ul {
-        display: block;
-    }
-    /* Widen the fixed sidebar */
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-        top: 20px;
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-        position: absolute; /* Undo the static from mobile first approach */
-    }
-    .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
-        margin-top: 0;
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-    }
-}
-@media (min-width: 1200px) {
-    /* Widen the fixed sidebar again */
-    .bs-docs-sidebar.affix-bottom,
-    .bs-docs-sidebar.affix {
-        width: 263px;
-    }
-}
-</style>
-<script type="text/javascript">
-$(function() {
-    'use strict';
-
-    $('.bs-docs-sidebar li').first().addClass('active');
-
-    $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
-    $('.bs-docs-sidebar').affix();
-});
-</script>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
 </head>
 <body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Sixth - system for data storage, computation, exploration and interaction</h1>
+<div id="content" class="content">
+<h1 class="title">Sixth - system for data storage, computation, exploration and interaction</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org24fd601">1. General</a>
+<ul>
+<li><a href="#org72de14c">1.1. Source code</a></li>
+</ul>
+</li>
+<li><a href="#org4ce9455">2. Vision - A tool to amplify human ability</a>
+<ul>
+<li><a href="#org5adfbed">2.1. Extensible, programmable computing environment examples</a></li>
+</ul>
+</li>
+<li><a href="#org81ffca1">3. Current status</a></li>
+<li><a href="#org72569c2">4. Architecture / components</a></li>
+<li><a href="#org574658b">5. Frequently Given Answers</a></li>
+<li><a href="#org6cb6b6d">6. See also</a>
+<ul>
+<li><a href="#orgc6ff886">6.1. Computation on multi dimensional data</a></li>
+<li><a href="#org0fcc836">6.2. Distributed, reliable, parallel computing systems</a></li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
 
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div id="outline-container-org24fd601" class="outline-2">
+<h2 id="org24fd601"><span class="section-number-2">1.</span> General</h2>
 <div class="outline-text-2" id="text-1">
 <ul class="org-ul">
 <li>This program is free software: released under Creative Commons Zero
-(CC0) license
-</li>
+(CC0) license</li>
 
 <li>Program author:
 <ul class="org-ul">
-<li>Svjatoslav Agejenko
-</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">mailto://svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
+<li>Svjatoslav Agejenko</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">mailto://svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
 
-<li><a href="https://www.svjatoslav.eu/projects/">Other software projects hosted at svjatoslav.eu</a>
-</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other software projects hosted at svjatoslav.eu</a></li>
 </ul>
 </div>
 
-<div id="outline-container-sec-1-1" class="outline-3">
-<h3 id="sec-1-1"><span class="section-number-3">1.1</span> Source code</h3>
+<div id="outline-container-org72de14c" class="outline-3">
+<h3 id="org72de14c"><span class="section-number-3">1.1.</span> Source code</h3>
 <div class="outline-text-3" id="text-1-1">
 <ul class="org-ul">
 <li>Note - Sixth is currently empty parent/shell project. You can find
-working code under <a href="#sec-4">sub-projects</a>.
-</li>
+working code under <a href="#org72569c2">sub-projects</a>.</li>
 
-<li><a href="https://www2.svjatoslav.eu/gitweb/?p=sixth.git;a=snapshot;h=HEAD;sf=tgz">Download latest snapshot in TAR GZ format</a>
-</li>
+<li><a href="https://www2.svjatoslav.eu/gitweb/?p=sixth.git;a=snapshot;h=HEAD;sf=tgz">Download latest snapshot in TAR GZ format</a></li>
 
-<li><a href="https://www2.svjatoslav.eu/gitweb/?p=sixth.git;a=summary">Browse Git repository online</a>
-</li>
+<li><a href="https://www2.svjatoslav.eu/gitweb/?p=sixth.git;a=summary">Browse Git repository online</a></li>
 
-<li>Clone Git repository using command:
+<li><p>
+Clone Git repository using command:
+</p>
 <pre class="example">
 git clone https://www2.svjatoslav.eu/git/sixth.git
-
-</pre>
-</li>
+</pre></li>
 </ul>
 </div>
 </div>
 </div>
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><a id="ID-1f4e1c17-d25f-4d92-aa9b-5785f1d86f4f" name="ID-1f4e1c17-d25f-4d92-aa9b-5785f1d86f4f"></a><span class="section-number-2">2</span> Vision - A tool to amplify human ability</h2>
+<div id="outline-container-org4ce9455" class="outline-2">
+<h2 id="org4ce9455"><span class="section-number-2">2.</span> Vision - A tool to amplify human ability</h2>
 <div class="outline-text-2" id="text-2">
 <p>
 Goal is, so called bicycle for the mind.
@@ -259,7 +285,7 @@ knowledge.
 </p>
 
 <p>
-<a href="#sec-2-1">See extensible, programmable computing environment examples</a>.
+<a href="#org5adfbed">See extensible, programmable computing environment examples</a>.
 </p>
 
 <p>
@@ -269,50 +295,43 @@ with the following priorities:
 
 <ul class="org-ul">
 <li>Makes data and insights easy to discover, understand, manipulate,
-transform and visualize.
-</li>
+transform and visualize.</li>
 
-<li>Workflow and user interface is intuitive, visual, realtime,
+<li><p>
+Workflow and user interface is intuitive, visual, realtime,
 3D-first.
+</p>
 
 <blockquote>
 <p>
 “Virtual reality holds the key to the evolution of the human mind”
 Dr. Lawrence Angelo, The Lawnmower Man (1992)
 </p>
-</blockquote>
-</li>
+</blockquote></li>
 
 <li>Computations are done primarily in <a href="https://www3.svjatoslav.eu/projects/sixth-data/">on versioned data in distributed,
 scalable, arbitrary dimensional hypercube based geometrical
-computation engine</a>.
-</li>
+computation engine</a>.</li>
 
-<li>Free and open.
-</li>
+<li>Free and open.</li>
 
 <li>Network first:
 <ul class="org-ul">
 <li>Cross device:
 <ul class="org-ul">
 <li>Easily switch devices and still access same data, workspaces and
-visualizations.
-</li>
+visualizations.</li>
 <li>Easily access and combine storage and computing resources of
-other connected devices.
-</li>
-</ul>
-</li>
+other connected devices.</li>
+</ul></li>
 
-<li>Ability to collaborate (multi user).
-</li>
-</ul>
-</li>
+<li>Ability to collaborate (multi user).</li>
+</ul></li>
 </ul>
 </div>
 
-<div id="outline-container-sec-2-1" class="outline-3">
-<h3 id="sec-2-1"><a id="ID-c19c5a3b-dfb0-4f7f-961c-a387b925669f" name="ID-c19c5a3b-dfb0-4f7f-961c-a387b925669f"></a><span class="section-number-3">2.1</span> Extensible, programmable computing environment examples</h3>
+<div id="outline-container-org5adfbed" class="outline-3">
+<h3 id="org5adfbed"><span class="section-number-3">2.1.</span> Extensible, programmable computing environment examples</h3>
 <div class="outline-text-3" id="text-2-1">
 <ul class="org-ul">
 <li><a href="https://www.johndcook.com/blog/2008/04/27/one-program-to-rule-them-all/">GNU Emacs</a> - At the heart, Emacs is text editor on top of Lisp
@@ -322,117 +341,154 @@ be added dynamically. Domain specific languages to fit particular
 problem could be developed as needed and Emacs extended to support
 those languages. Emacs provides text buffers that can be used to
 build user interfaces. So you can customize Emacs and Lisp to fit
-any problem domain.
-</li>
+any problem domain.</li>
 
 <li><a href="https://www.eclipse.org/ide/">Eclipse IDE</a> - In essence <a href="https://en.wikipedia.org/wiki/OSGi">OSGi</a> platform with a text
 editor. Computation done in java. Eclipse provides integration,
 runtime and GUI platform. One can develop Eclipse plugins to add
 necessary logic and visual parts to fit any problem. (IntelliJ and
-NetBeans have similar properties)
-</li>
+NetBeans have similar properties)</li>
 
 <li><a href="https://en.wikipedia.org/wiki/IBM_Notes">IBM Notes/Domino</a> - Custom database engine, software development
 platform, GUI editor, computation can be done in Java and
 LotusScript. You can build distributed business applications on it
-as a platform.
-</li>
+as a platform.</li>
 
 <li><a href="https://en.wikipedia.org/wiki/ABAP">SAP ABAP</a> - Custom database engine, runtime, GUI platform,
 development environment and programming language. Is being used as a
-platform to build business applications with any logic and UI.
-</li>
+platform to build business applications with any logic and UI.</li>
 
 <li><a href="https://en.wikipedia.org/wiki/Microsoft_Access">Microsoft Access</a> - Database management system that combines
 relational database engine with a graphical user interface and
-software-development tools.
-</li>
+software-development tools.</li>
 </ul>
 </div>
 </div>
 </div>
-<div id="outline-container-sec-3" class="outline-2">
-<h2 id="sec-3"><span class="section-number-2">3</span> Current status</h2>
+<div id="outline-container-org81ffca1" class="outline-2">
+<h2 id="org81ffca1"><span class="section-number-2">3.</span> Current status</h2>
 <div class="outline-text-2" id="text-3">
 <ul class="org-ul">
-<li>Formulated high-level <a href="#sec-2">vision / goal</a>.
-</li>
+<li>Formulated high-level <a href="#org4ce9455">vision / goal</a>.</li>
 
-<li>In the process of implementing some of <a href="#sec-4">building blocks</a>.
-</li>
+<li>In the process of implementing some of <a href="#org72569c2">building blocks</a>.</li>
 
 <li>System is nowhere near complete (given magnitude of effort required
 and almost non-existent free time available). Contributions are
-welcome !
-</li>
+welcome !</li>
 </ul>
 </div>
 </div>
-<div id="outline-container-sec-4" class="outline-2">
-<h2 id="sec-4"><a id="ID-52dbbf4c-2ef4-42a6-8331-ad006b6a52ae" name="ID-52dbbf4c-2ef4-42a6-8331-ad006b6a52ae"></a><span class="section-number-2">4</span> Architecture / components</h2>
+<div id="outline-container-org72569c2" class="outline-2">
+<h2 id="org72569c2"><span class="section-number-2">4.</span> Architecture / components</h2>
 <div class="outline-text-2" id="text-4">
 <ul class="org-ul">
 <li><a href="https://www3.svjatoslav.eu/projects/sixth/">Sixth</a> - Parent project.
 <ul class="org-ul">
-<li><a href="https://www3.svjatoslav.eu/projects/sixth-data/">Sixth Data</a> - Data storage and computation engine.
-</li>
+<li><a href="https://www3.svjatoslav.eu/projects/sixth-data/">Sixth Data</a> - Data storage and computation engine.</li>
 <li><a href="https://www3.svjatoslav.eu/projects/sixth-3d/">Sixth 3D</a> - 3D engine - for user interface and data visualization.
 <ul class="org-ul">
-<li><a href="https://www3.svjatoslav.eu/projects/sixth-3d-demos/">Sixth 3D engine demos</a> - Demonstration of Sixth 3D engine capabilities.
-</li>
-</ul>
-</li>
-</ul>
-</li>
+<li><a href="https://www3.svjatoslav.eu/projects/sixth-3d-demos/">Sixth 3D engine demos</a> - Demonstration of Sixth 3D engine capabilities.</li>
+</ul></li>
+</ul></li>
 </ul>
 </div>
 </div>
 
-<div id="outline-container-sec-5" class="outline-2">
-<h2 id="sec-5"><span class="section-number-2">5</span> Frequently Given Answers</h2>
+<div id="outline-container-org574658b" class="outline-2">
+<h2 id="org574658b"><span class="section-number-2">5.</span> Frequently Given Answers</h2>
 <div class="outline-text-2" id="text-5">
 <ul class="org-ul">
 <li>Why such name ?
 <ul class="org-ul">
-<li>In short: it's just a number.
-</li>
+<li>In short: it's just a number.</li>
 <li>Many years ago inspired by the ideas of <a href="https://en.wikipedia.org/wiki/Forth_(programming_language)">Forth (programming
 language)</a> I decided to create my own implementation <a href="https://www3.svjatoslav.eu/projects/fifth/">Fifth</a>
-(computing/programming environment).
-</li>
+(computing/programming environment).</li>
 <li>Forth/Fifth felt a bit too low-level language. So current
-project/approach is an attempt using Java.
-</li>
-</ul>
-</li>
+project/approach is an attempt using Java.</li>
+</ul></li>
 </ul>
 </div>
 </div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a>
-<ul class="nav">
-<li><a href="#sec-1-1">1.1. Source code</a></li>
+<div id="outline-container-org6cb6b6d" class="outline-2">
+<h2 id="org6cb6b6d"><span class="section-number-2">6.</span> See also</h2>
+<div class="outline-text-2" id="text-6">
+<p>
+Following projects are inspiring or have similar goals:
+</p>
+
+<ul class="org-ul">
+<li><a href="https://github.com/kaveh808/kons-9">kons-9</a>: An IDE For 3D Production. The intention is to develop a
+flexible and extensible system in which can be built a wide variety
+of application and domain specific tools and packages.</li>
+
+<li><a href="https://gtoolkit.com/">Glamorous Toolkit</a>: Moldable development environment. It is a live
+notebook. It is a flexible search interface. It is a fancy code
+editor. It is a software analysis platform. It is a data
+visualization engine. All in one.</li>
 </ul>
-</li>
-<li><a href="#sec-2">2. Vision - A tool to amplify human ability</a>
-<ul class="nav">
-<li><a href="#sec-2-1">2.1. Extensible, programmable computing environment examples</a></li>
+</div>
+
+<div id="outline-container-orgc6ff886" class="outline-3">
+<h3 id="orgc6ff886"><span class="section-number-3">6.1.</span> Computation on multi dimensional data</h3>
+<div class="outline-text-3" id="text-6-1">
+<ul class="org-ul">
+<li><a href="https://rd-alliance.org/system/files/Array-Databases_final-report.pdf">Array Databases: Concepts, Standards, Implementations</a></li>
+
+<li><a href="https://tiledb.com/">TileDB</a>
+<ul class="org-ul">
+<li>Analyze and share complex multi-dimensional data at scale</li>
+</ul></li>
+
+<li><a href="../../sixth-data/doc/index.html#ID-01aa65c1-3d44-44a8-9b90-58454bc6be80">CM-1 Connection Machine</a></li>
+
+<li><a href="https://lisp-stat.dev/">Lisp-Stat: An environment for Statistical Computing</a></li>
 </ul>
-</li>
-<li><a href="#sec-3">3. Current status</a></li>
-<li><a href="#sec-4">4. Architecture / components</a></li>
-<li><a href="#sec-5">5. Frequently Given Answers</a></li>
+</div>
+</div>
+<div id="outline-container-org0fcc836" class="outline-3">
+<h3 id="org0fcc836"><span class="section-number-3">6.2.</span> Distributed, reliable, parallel computing systems</h3>
+<div class="outline-text-3" id="text-6-2">
+<ul class="org-ul">
+<li><a href="https://github.com/vygr/ChrysaLisp">ChrysaLisp</a>
+<ul class="org-ul">
+<li>Assembler/C-Script/Lisp 64 bit, MIMD, multi CPU, multi threaded,
+multi core, multi user Parallel OS. With GUI, Terminal, OO
+Assembler, Class libraries, C-Script compiler, Lisp interpreter,
+Debugger, and more&#x2026;</li>
+</ul></li>
+
+<li><a href="http://www.uruk.org/emu/Taos.html">TAOS</a>
+<ul class="org-ul">
+<li>Completely distributed operating system/virtual machine:</li>
+</ul></li>
+
+<li><a href="http://esug.org/data/ESUG2015/3%20wednesday/1100-1130%20SQL%20Queries%20on%20Smalltalk%20Objects/SQL%20Queries%20in%20Smalltalk%20(James%20Foster).pdf">Gemstone/S</a>
+<ul class="org-ul">
+<li>Completely distributed smalltalk based computing
+system.</li>
+</ul></li>
+
+<li><a href="http://phantomos.org/">http://phantomos.org/</a>
+<ul class="org-ul">
+<li>Programs run forever. System crash or reboot does not destroy
+state of running program.</li>
+</ul></li>
+
+<li><a href="http://wiki.squeak.org/squeak/2665">Magma</a>
+<ul class="org-ul">
+<li>Multi-user object database for Squeak</li>
+</ul></li>
 </ul>
 </div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-04-20 Mon 22:24</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
 </div>
-</footer>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2022-10-30 Sun 12:26</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
 </body>
 </html>
diff --git a/doc/index.org b/doc/index.org
index b98cb04..e758bb7 100644
--- a/doc/index.org
+++ b/doc/index.org
@@ -128,3 +128,44 @@ with the following priorities:
     (computing/programming environment).
   - Forth/Fifth felt a bit too low-level language. So current
     project/approach is an attempt using Java.
+* See also
+Following projects are inspiring or have similar goals:
+
++ [[https://github.com/kaveh808/kons-9][kons-9]]: An IDE For 3D Production. The intention is to develop a
+  flexible and extensible system in which can be built a wide variety
+  of application and domain specific tools and packages.
+
++ [[https://gtoolkit.com/][Glamorous Toolkit]]: Moldable development environment. It is a live
+  notebook. It is a flexible search interface. It is a fancy code
+  editor. It is a software analysis platform. It is a data
+  visualization engine. All in one.
+
+** Computation on multi dimensional data
++ [[https://rd-alliance.org/system/files/Array-Databases_final-report.pdf][Array Databases: Concepts, Standards, Implementations]]
+
++ [[https://tiledb.com/][TileDB]]
+  + Analyze and share complex multi-dimensional data at scale
+
++ [[id:01aa65c1-3d44-44a8-9b90-58454bc6be80][CM-1 Connection Machine]]
+
++ [[https://lisp-stat.dev/][Lisp-Stat: An environment for Statistical Computing]]
+** Distributed, reliable, parallel computing systems
++ [[https://github.com/vygr/ChrysaLisp][ChrysaLisp]]
+  + Assembler/C-Script/Lisp 64 bit, MIMD, multi CPU, multi threaded,
+    multi core, multi user Parallel OS. With GUI, Terminal, OO
+    Assembler, Class libraries, C-Script compiler, Lisp interpreter,
+    Debugger, and more...
+
++ [[http://www.uruk.org/emu/Taos.html][TAOS]]
+  + Completely distributed operating system/virtual machine:
+
++ [[http://esug.org/data/ESUG2015/3%20wednesday/1100-1130%20SQL%20Queries%20on%20Smalltalk%20Objects/SQL%20Queries%20in%20Smalltalk%20(James%20Foster).pdf][Gemstone/S]]
+  + Completely distributed smalltalk based computing
+    system.
+
++ http://phantomos.org/
+  + Programs run forever. System crash or reboot does not destroy
+    state of running program.
+
++ [[http://wiki.squeak.org/squeak/2665][Magma]]
+  + Multi-user object database for Squeak
-- 
2.20.1