patch 9.1.0865: filetype: org files are not recognized

Commit: 
https://github.com/vim/vim/commit/0684800c853ee5bd6e6736389b1a6ebe6a16a741
Author: Luca Saccarola <github.e4...@aleeas.com>
Date:   Thu Nov 14 22:44:14 2024 +0100

    patch 9.1.0865: filetype: org files are not recognized
    
    Problem:  filetype: org files are not recognized
    Solution: detect '*.org' files as 'org' filetype,
              include filetype and syntax plugin
              (Luca Saccarola)
    
    closes: #16054
    
    Signed-off-by: Luca Saccarola <github.e4...@aleeas.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/filetype.txt b/runtime/doc/filetype.txt
index 8b4e25e17..06fc82923 100644
--- a/runtime/doc/filetype.txt
+++ b/runtime/doc/filetype.txt
@@ -1,4 +1,4 @@
-*filetype.txt* For Vim version 9.1.  Last change: 2024 Nov 12
+*filetype.txt* For Vim version 9.1.  Last change: 2024 Nov 14
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -843,6 +843,12 @@ To enable folding use this: >
        let g:markdown_recommended_style = 0
 
 
+ORG                                                    *ft-org-plugin*
+
+To enable folding use this: >
+       let g:org_folding = 1
+<
+
 PDF                                                    *ft-pdf-plugin*
 
 Two maps, <C-]> and <C-T>, are provided to simulate a tag stack for navigating
diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 59add1916..897f356bb 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -1472,6 +1472,9 @@ au BufNewFile,BufRead 
*.markdown,*.mdown,*.mkd,*.mkdn,*.mdwn,*.md
        \   setf markdown |
        \ endif
 
+" Org (Emacs' org-mode)
+au BufNewFile,BufRead *.org                    setf org
+
 " Mason (it used to include *.comp, are those Mason files?)
 au BufNewFile,BufRead *.mason,*.mhtml  setf mason
 
diff --git a/runtime/ftplugin/org.vim b/runtime/ftplugin/org.vim
new file mode 100644
index 000000000..45a5e19d4
--- /dev/null
+++ b/runtime/ftplugin/org.vim
@@ -0,0 +1,37 @@
+" Vim filetype plugin file
+" Language:    Org
+" Maintainer:  Luca Saccarola <github.e4...@aleeas.com>
+" Last Change: 2024 Nov 14
+
+if exists("b:did_ftplugin")
+    finish
+endif
+let b:did_ftplugin = 1
+
+if exists('b:undo_ftplugin')
+    let b:undo_ftplugin .= "|setl cms< com< fo< flp<"
+else
+    let b:undo_ftplugin = "setl cms< com< fo< flp<"
+endif
+
+setl commentstring=#\ %s
+setl comments=fb:*,fb:-,fb:+,b:#,b:\:
+
+setl formatoptions+=nql
+setl formatlistpat=^\s*\(\(\d\|\a\)\+[.)]\|[+-]\)\s\+
+
+function OrgFoldExpr()
+    let l:depth = match(getline(v:lnum), '\(^\*\+\)\@<=\( .*$\)\@=')
+    if l:depth > 0 && synIDattr(synID(v:lnum, 1, 1), 'name') =~# 
'\m^orgHeadline'
+        return ">" . l:depth
+    endif
+    return "="
+endfunction
+
+if has("folding") && get(g:, 'org_folding', 0)
+    setl foldexpr=OrgFoldExpr()
+    setl foldmethod=expr
+    let b:undo_ftplugin .= "|setl foldexpr< foldmethod<"
+endif
+
+" vim: ts=8 sts=2 sw=2 et
diff --git a/runtime/syntax/org.vim b/runtime/syntax/org.vim
new file mode 100644
index 000000000..89c8de31b
--- /dev/null
+++ b/runtime/syntax/org.vim
@@ -0,0 +1,71 @@
+" Vim syntax file
+" Language:    Org
+" Maintainer:  Luca Saccarola <github.e4...@aleeas.com>
+" Last Change: 2024 Nov 14
+"
+" Reference Specification: Org mode manual
+"   GNU Info: `$ info Org`
+"   Web: <https://orgmode.org/manual/index.html>
+
+" Quit when a (custom) syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+let b:current_syntax = 'org'
+
+syn case ignore
+
+" Bold
+syn region orgBold matchgroup=orgBoldDelimiter start="\(^\|[- 
'"({\]]\)\@<=\*\ze[^ ]" end="^\@!\*\([^\k\*]\|$\)\@=" keepend
+hi def link orgBold markdownBold
+hi def link orgBoldDelimiter orgBold
+
+" Italic
+syn region orgItalic matchgroup=orgItalicDelimiter start="\(^\|[- 
'"({\]]\)\@<=\/\ze[^ ]" end="^\@!\/\([^\k\/]\|$\)\@=" keepend
+hi def link orgItalic markdownItalic
+hi def link orgItalicDelimiter orgItalic
+
+" Strikethrogh
+syn region orgStrikethrough matchgroup=orgStrikethroughDelimiter start="\(^\|[ 
'"({\]]\)\@<=+\ze[^ ]" end="^\@!+\([^\k+]\|$\)\@=" keepend
+hi def link orgStrikethrough markdownStrike
+hi def link orgStrikethroughDelimiter orgStrikethrough
+
+" Underline
+syn region orgUnderline matchgroup=orgUnderlineDelimiter start="\(^\|[- 
'"({\]]\)\@<=_\ze[^ ]" end="^\@!_\([^\k_]\|$\)\@=" keepend
+
+" Headlines
+syn match orgHeadline "^\*\+\s\+.*$" keepend
+hi def link orgHeadline Title
+
+" Line Comment
+syn match  orgLineComment /^\s*#\s\+.*$/ keepend
+hi def link orgLineComment Comment
+
+" Block Comment
+syn region orgBlockComment matchgroup=orgBlockCommentDelimiter start="

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