From 96c5c20e418fa95b7137b6ef418946f25de91b1b Mon Sep 17 00:00:00 2001
From: Adam Stankiewicz <sheerun@sher.pl>
Date: Tue, 6 Feb 2018 11:16:48 +0800
Subject: [PATCH] Include indentation setting for markdown, fixes #270

---
 README.md           |  2 +-
 build               |  2 +-
 indent/markdown.vim | 79 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+), 2 deletions(-)
 create mode 100644 indent/markdown.vim

diff --git a/README.md b/README.md
index 0b0d51bc2..0f2bf3255 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ If you need full functionality of any plugin, please use it directly with your p
 - [livescript](https://github.com/gkz/vim-ls) (syntax, indent, compiler, ftplugin)
 - [lua](https://github.com/tbastos/vim-lua) (syntax, indent)
 - [mako](https://github.com/sophacles/vim-bundle-mako) (syntax, indent, ftplugin)
-- [markdown](https://github.com/plasticboy/vim-markdown) (syntax)
+- [markdown](https://github.com/plasticboy/vim-markdown) (syntax, indent)
 - [mathematica](https://github.com/rsmenon/vim-mathematica) (syntax, ftplugin)
 - [nginx](https://github.com/chr4/nginx.vim) (syntax, indent, ftplugin)
 - [nim](https://github.com/zah/nim.vim) (syntax, compiler, indent)
diff --git a/build b/build
index 36668e028..42a121dba 100755
--- a/build
+++ b/build
@@ -5,7 +5,7 @@ set -E
 DIRS="syntax indent compiler autoload ftplugin after/syntax after/indent after/ftplugin"
 DIRS_BASIC="syntax compiler indent after/syntax after/indent"
 DIRS_ALL="syntax indent compiler autoload ftplugin after"
-DIRS_SYNTAX="syntax after/syntax"
+DIRS_SYNTAX="syntax indent after/syntax after/indent"
 DIRS_JAVASCRIPT="${DIRS} extras"
 DIRS_RM="$DIRS_JAVASCRIPT"
 
diff --git a/indent/markdown.vim b/indent/markdown.vim
new file mode 100644
index 000000000..fa2b460d8
--- /dev/null
+++ b/indent/markdown.vim
@@ -0,0 +1,79 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'markdown') == -1
+  
+if exists("b:did_indent") | finish | endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetMarkdownIndent()
+setlocal nolisp
+setlocal autoindent
+
+" Automatically insert bullets
+setlocal formatoptions+=r
+" Do not automatically insert bullets when auto-wrapping with text-width
+setlocal formatoptions-=c
+" Accept various markers as bullets
+setlocal comments=b:*,b:+,b:-
+
+" Automatically continue blockquote on line break
+setlocal comments+=b:>
+
+" Only define the function once
+if exists("*GetMarkdownIndent") | finish | endif
+
+function! s:IsMkdCode(lnum)
+    let name = synIDattr(synID(a:lnum, 1, 0), 'name')
+    return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
+endfunction
+
+function! s:IsLiStart(line)
+    return a:line !~ '^ *\([*-]\)\%( *\1\)\{2}\%( \|\1\)*$' &&
+      \    a:line =~ '^\s*[*+-] \+'
+endfunction
+
+function! s:IsHeaderLine(line)
+    return a:line =~ '^\s*#'
+endfunction
+
+function! s:IsBlankLine(line)
+    return a:line =~ '^$'
+endfunction
+
+function! s:PrevNonBlank(lnum)
+    let i = a:lnum
+    while i > 1 && s:IsBlankLine(getline(i))
+        let i -= 1
+    endwhile
+    return i
+endfunction
+
+function GetMarkdownIndent()
+    if v:lnum > 2 && s:IsBlankLine(getline(v:lnum - 1)) && s:IsBlankLine(getline(v:lnum - 2))
+        return 0
+    endif
+    let list_ind = get(g:, "vim_markdown_new_list_item_indent", 4)
+    " Find a non-blank line above the current line.
+    let lnum = s:PrevNonBlank(v:lnum - 1)
+    " At the start of the file use zero indent.
+    if lnum == 0 | return 0 | endif
+    let ind = indent(lnum)
+    let line = getline(lnum)    " Last line
+    let cline = getline(v:lnum) " Current line
+    if s:IsLiStart(cline)
+        " Current line is the first line of a list item, do not change indent
+        return indent(v:lnum)
+    elseif s:IsHeaderLine(cline) && !s:IsMkdCode(v:lnum)
+        " Current line is the header, do not indent
+        return 0
+    elseif s:IsLiStart(line)
+        if s:IsMkdCode(lnum)
+            return ind
+        else
+            " Last line is the first line of a list item, increase indent
+            return ind + list_ind
+        end
+    else
+        return ind
+    endif
+endfunction
+
+endif