Write change log for version 1.3 of org.vim

"LaTeX math fragments" will now be syntax highlighted in Org mode files.
If `conceallevel=2` is set, the LaTeX symbols will be displayed as their
Unicode equivalents.  E.g.

    $\alpha$ --> α
    \( x^2 \)  --> x²

For more info, see: <https://orgmode.org/manual/LaTeX-fragments.html#LaTeX-fragments>

README.org

@@ -17,6 +17,33 @@ implementation.  It also allowed me use [[https://github.com/orgzly/orgzly-andro
 *Note*: this project is considered /feature complete/ by the author, so the
 addition of new features will be unlikely.
 
+
+** Installation
+
+Installation of Org.vim can be performed by using your preferred plugin/package
+management tool(s).  If you don't have a Vim package manager I recommend using
+Vim 8 packages.
+
+Just run these 2 commands from your shell.
+
+#+BEGIN_SRC sh
+git clone https://github.com/axvr/org.vim ~/.vim/pack/plugins/start/org
+vim +'helptags ~/.vim/pack/plugins/start/org/doc/' +q
+#+END_SRC
+
+Once installed check out the Org.vim manual (run ~:help org.txt~ to open it) for
+usage information and configuration options.
+
+
+** Screenshots
+
+Different Vim colour schemes will result in different appearances.
+
+| [[https://github.com/romainl/Apprentice][Apprentice]] | [[https://github.com/axvr/photon.vim][Photon]] |
+|--------+------------|
+| [[https://raw.githubusercontent.com/axvr/org.vim/images/apprentice.png]] | [[https://raw.githubusercontent.com/axvr/org.vim/images/photon.png]] |
+
+
 ** Licence
 
 Copyright (c) 2018–2020, Alex Vear.

TODO

@@ -2,6 +2,11 @@ MAYBE:
   - Syntax highlight checkboxes and checkbox cookies
   - Separate syntax group for heading delimiters
   - Syntax highlight and indent properties
+  - Hightlight concealed TeX the same as normal text
+  - Close inline block using same number of starting delimiters.
+  - Try to get text attributes to stack (e.g. underlined text in bold text)
+    - TeX math fragments in bold, italic, etc. text
+  - Set a max number of lines to search for end delimiter for bold/italic/etc. to 3 (might not be possible)
 
 UNLIKELY:
   - Implement Emacs's abbreviations (e.g. '\<s<TAB>')

doc/org.txt

@@ -7,12 +7,11 @@
 Welcome to the org.vim user manual.            *org*  *org.vim*  *vim-org*  *outline*
 
     1. Introduction ............................... |org-intro|
-    2. Installation ............................... |org-install|
+    2. Usage ...................................... |org-usage|
-    3. Basic syntax ............................... |org-syntax|
+    3. Configuration .............................. |org-configuration|
-    4. Configuration .............................. |org-configuration|
+    4. Change log ................................. |org-changelog|
-    5. Change log ................................. |org-changelog|
+    5. Legal ...................................... |org-legal|
-    6. Legal ...................................... |org-legal|
+    6. References ................................. |org-references|
-    7. References ................................. |org-references|
 
 ==============================================================================
  1. INTRODUCTION                                                    *org-intro*
@@ -25,87 +24,21 @@ Org mode (and Outline mode) files, rather than trying to be a full featured
 Org mode plugin -- that is what Emacs is for.
 
 ==============================================================================
- 2. INSTALLATION                                                  *org-install*
+ 2. USAGE                                                           *org-usage*
-
-Installation of Org.vim can be performed by using your favourite Vim
-plugin/package management tool(s).
-
-==============================================================================
- 3. BASIC SYNTAX                                                   *org-syntax*
-
-Outline mode isn't used much anymore, one place it is still used is for GNU
-Emacs release notes.  It contains only a single piece of syntax: heading
-levels denoted by asterisks.
->
-    * This is a heading
-
-    The first heading is equivalent to <h1> tags in HTML files.
-
-    ** This is a sub-heading
-
-    This heading uses 2 asterisks to denote that it is a below the previous
-    heading.
-
-    *** This is a sub-sub-heading
-
-    * This is another top level heading
-
-    Org.vim supports as many heading levels as you want, and each of these
-    headings can use Vim's folding keys and fold navigation.
-<
-Org mode is a huge superset of Outline mode.  It uses the same heading syntax
-mentioned above, but supports many, many more features.  Org.vim supports the
-core subset of Org mode syntax, which should be suitable for most use cases.
-
-The following is a short overview of essential Org mode syntax.
->
-    Org mode supports *bold*, /italic/, _underline_ and +strikethrough+ text
-    which is delimited by asterisks, forward-slashes, underscores, and pluses
-    respectively.
-
-    Paragraphs are separated by empty lines.
-
-    ~monospaced~ and =verbatim= text are delimited by equals signs and tilde
-    respectively.
-
-    : Entire lines can be marked as verbatim by prepending with a colon.
-
-    # Comments are lines prepended with a hash.
-
-    This is a link to the Org.vim repository [[https://github.com/axvr/org.vim]]
-
-    This is also a link to the [[https://github.com/axvr/org.vim][Org.vim repository]]
-    where the text "Org.vim repository" is the title of the link (link text).
-
-    - This is an item in a list.
-    - This is another item in the same list.
-      - This is a sub-item for the above list item.
-        - This is a sub-item for the previous list item.
-    + List items can also be denoted by using a plus sign
-    1. Or by numbering each item.
-    2. Like so.
-      - [ ] List items can also have checkboxes by using open and closing
-            square brackets.
-      - [X] By placing an uppercase X in between the square brackets you can
-            mark the item as "done".
-<
-Org.vim supports a lot more of Org mode's vast syntax than was mentioned here.
-You can learn much more of Org mode's syntax online.
 
 When Org.vim is installed, files ending with the extension `.org` will
-automatically have syntax highlighting and folding support enabled.  It can
+automatically have syntax highlighting and folding support enabled.  You can
-also be manually enabled with the following command.
+also manually enable it by setting the 'filetype' option.
 >
     :set filetype=org
 <
 Outline mode doesn't have a file extension like Org mode so you will have to
-enable it manually.  This is simply done by opening the file and runing the
+enable it manually.
-following command.
 >
     :set filetype=outline
 <
 ==============================================================================
- 4. CONFIGURATION                                           *org-configuration*
+ 3. CONFIGURATION                                           *org-configuration*
 
                                                                   *org-folding*
 
@@ -195,7 +128,16 @@ To disable italics only in a single buffer, use this instead:
     let b:org_use_italics = 0
 <
 ==============================================================================
- 5. CHANGE LOG                                                  *org-changelog*
+ 4. CHANGE LOG                                                  *org-changelog*
+
+v1.3 [2020-05-02]~
+
+  * Added syntax highlighting of LaTeX math fragments.  (Thanks Gavinok!)
+  * Improved detection of inline bold, italic, underline, strike through,
+    verbatim and code syntax.
+  * Grey out "strike through" text by default.
+  * Updated README content and added screenshots.
+  * Removed the "basic Org mode syntax" section from this document.
 
 v1.2 [2020-02-15]~
 
@@ -221,7 +163,7 @@ v1.0 [2019-09-28]~
   * Initial stable release.
 
 ==============================================================================
- 6. LEGAL                                                           *org-legal*
+ 5. LEGAL                                                           *org-legal*
 
 Org.vim is based on the work of many other people (far too many to list here),
 without them org.vim would not have been possible.  The most notable of thse

syntax/org.vim

@@ -18,10 +18,10 @@ endif
 syntax spell toplevel
 
 " Bold, underine, italic, etc.
-syntax region orgItalic        matchgroup=orgItalicDelimiter        start="[^ \t\k]\@<!\/\k\@=\/\@!" end="\k\@<=\/\@<!\/" keepend contains=@Spell
+syntax region orgItalic        matchgroup=orgItalicDelimiter        start="\(^\|[- '"({\]]\)\@<=\/\ze[^ ]" end="^\@!\/\([^\k\/]\|$\)\@=" keepend contains=@Spell
-syntax region orgBold          matchgroup=orgBoldDelimiter          start="[^ \t\k]\@<!\*\k\@=\*\@!" end="\k\@<=\*\@<!\*" keepend contains=@Spell
+syntax region orgBold          matchgroup=orgBoldDelimiter          start="\(^\|[- '"({\]]\)\@<=\*\ze[^ ]" end="^\@!\*\([^\k\*]\|$\)\@=" keepend contains=@Spell
-syntax region orgUnderline     matchgroup=orgUnderlineDelimiter     start="[^ \t\k]\@<!_\k\@=_\@!"   end="\k\@<=_\@<!_"   keepend contains=@Spell
+syntax region orgUnderline     matchgroup=orgUnderlineDelimiter     start="\(^\|[- '"({\]]\)\@<=_\ze[^ ]"  end="^\@!_\([^\k_]\|$\)\@="   keepend contains=@Spell
-syntax region orgStrikethrough matchgroup=orgStrikethroughDelimiter start="[^ \t\k]\@<!+\k\@=+\@!"   end="\k\@<=+\@<!+"   keepend contains=@Spell
+syntax region orgStrikethrough matchgroup=orgStrikethroughDelimiter start="\(^\|[- '"({\]]\)\@<=+\ze[^ ]"  end="^\@!+\([^\k+]\|$\)\@="   keepend contains=@Spell
 
 if org#option('org_use_italics', 1)
     highlight def orgItalic term=italic cterm=italic gui=italic
@@ -34,6 +34,8 @@ highlight def orgUnderline term=underline cterm=underline gui=underline
 highlight def link orgBoldDelimiter      orgBold
 highlight def link orgUnderlineDelimiter orgUnderline
 
+highlight def link orgStrikethrough Ignore
+highlight def link orgStrikethroughDelimiter orgStrikethrough
 
 " Options
 syntax match  orgOption /^\s*#+\w\+.*$/ keepend
@@ -45,8 +47,8 @@ highlight def link orgTitle Title
 
 
 " Code and vervatim text
-syntax region orgCode     matchgroup=orgCodeDelimiter     start="[^ \t\k]\@<!\~\k\@=\~\@!" end="\k\@<=\~\@<!\~" keepend
+syntax region orgCode     matchgroup=orgCodeDelimiter     start="\(^\|[- '"({\]]\)\@<=\~\ze[^ ]" end="^\@!\~\([^\k\~]\|$\)\@=" keepend
-syntax region orgVerbatim matchgroup=orgVerbatimDelimiter start="[^ \t\k]\@<!=\k\@==\@!"   end="\k\@<==\@<!="   keepend
+syntax region orgVerbatim matchgroup=orgVerbatimDelimiter start="\(^\|[- '"({\]]\)\@<==\ze[^ ]"  end="^\@!=\([^\k=]\|$\)\@="   keepend
 syntax match  orgVerbatim /^\s*: .*$/ keepend
 syntax region orgVerbatim matchgroup=orgBlockDelimiter start="\c^\s*#+BEGIN_.*"      end="\c^\s*#+END_.*"      keepend
 syntax region orgCode     matchgroup=orgBlockDelimiter start="\c^\s*#+BEGIN_SRC"     end="\c^\s*#+END_SRC"     keepend
@@ -65,12 +67,12 @@ highlight def link orgComment Comment
 
 
 " Headings
-syntax match orgHeading1 /^\s*\*\{1}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading1 /^\s*\*\{1}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
-syntax match orgHeading2 /^\s*\*\{2}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading2 /^\s*\*\{2}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
-syntax match orgHeading3 /^\s*\*\{3}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading3 /^\s*\*\{3}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
-syntax match orgHeading4 /^\s*\*\{4}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading4 /^\s*\*\{4}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
-syntax match orgHeading5 /^\s*\*\{5}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading5 /^\s*\*\{5}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
-syntax match orgHeading6 /^\s*\*\{6,}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading6 /^\s*\*\{6,}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
 
 syntax match orgTag /:\w\{-}:/ contained contains=orgTag
 exec 'syntax keyword orgTodo contained ' . join(org#option('org_state_keywords', ['TODO', 'NEXT', 'DONE']), ' ')
@@ -111,5 +113,23 @@ highlight def link orgHyperCentre Comment
 highlight def link orgHyperLeft Comment
 highlight def link orgHyperRight Comment
 
+" TeX
+" Support for both inline and block based embedded latex
+" eg: $Latex$ for inline or $$ LaTeX $$ for a block
+" Note:
+" - $LaTeX$ uses the tex.vim syntax for its conceal properties
+" - Inspired by https://github.com/vim-pandoc/vim-pandoc-syntax
+" - the conceal settings follows your g:tex_conceal setting for
+"   more info run :h tex-conceal.
+" Ref: https://orgmode.org/manual/LaTeX-fragments.html#LaTeX-fragments
+syntax include @LATEX syntax/tex.vim
+syntax region orgMath     start="\\begin\[.*\]{.*}"  end="\\end{.*}"         keepend contains=@LATEX
+syntax region orgMath     start="\\begin{.*}"        end="\\end{.*}"         keepend contains=@LATEX
+syntax region orgMath     start="\\\["               end="\\\]"              keepend contains=@LATEX
+syntax region orgMath     start="\\("                end="\\)"               keepend contains=@LATEX
+syntax region orgMath     start="\S\@<=\$\|\$\S\@="  end="\S\@<=\$\|\$\S\@=" keepend oneline contains=@LATEX
+syntax region orgMath     start=/\$\$/               end=/\$\$/              keepend contains=@LATEX
+syntax match  orgMath /\\\$/ conceal cchar=$
+hi def link orgMath     String
 
 let b:current_syntax = 'org'