X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/f6654fa0db0e6d950f501cd22df3d0526036709e..9f4d1c8db08cca85c46de7f3f0b944ce3cafe35c:/after/ftplugin/markdown.vim

diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index 497a5a2..8be6ff9 100644
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -1,3 +1,4 @@
+" vim: ts=4 sw=4:
 " folding for Markdown headers, both styles (atx- and setex-)
 " http://daringfireball.net/projects/markdown/syntax#header
 "
@@ -6,47 +7,195 @@
 "
 " original version from Steve Losh's gist: https://gist.github.com/1038710
 
-func! s:is_mkdCode(lnum)
-    return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
-endfunc
-
-func! s:effective_line(lnum)
-    let line = getline(a:lnum)
-    return (line !~ '^=\|^#' || s:is_mkdCode(a:lnum)) ? '' : line
-endfunc
-
-func! Foldexpr_markdown(lnum)
-    let l2 = s:effective_line(a:lnum+1)
-    if  l2 =~ '^==\+\s*'
-        " next line is underlined (level 1)
-        return '>1'
-    elseif l2 =~ '^--\+\s*'
-        " next line is underlined (level 2)
-        return '>2'
-    endif
+function! s:is_mkdCode(lnum)
+    let name = synIDattr(synID(a:lnum, 1, 0), 'name')
+    return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
+endfunction
 
-    let l1 = s:effective_line(a:lnum)
-    if l1 =~ '^#'
-        " don't include the section title in the fold
-        return '-1'
-    endif
+if get(g:, "vim_markdown_folding_style_pythonic", 0)
+    function! Foldexpr_markdown(lnum)
+        let l1 = getline(a:lnum)
+        "~~~~~ keep track of fenced code blocks ~~~~~
+        "If we hit a code block fence
+        if l1 =~ '````*' || l1 =~ '\~\~\~\~*'
+            " toggle the variable that says if we're in a code block
+            if b:fenced_block == 0
+                let b:fenced_block = 1
+            elseif b:fenced_block == 1
+                let b:fenced_block = 0
+            endif
+        " else, if we're caring about front matter
+        elseif g:vim_markdown_frontmatter == 1
+            " if we're in front matter and not on line 1
+            if b:front_matter == 1 && a:lnum > 2
+                let l0 = getline(a:lnum-1)
+                " if the previous line fenced front matter
+                if l0 == '---'
+                    " we must not be in front matter
+                    let b:front_matter = 0
+                endif
+            " else, if we're on line one
+            elseif a:lnum == 1
+                " if we hit a front matter fence
+                if l1 == '---'
+                    " we're in the front matter
+                    let b:front_matter = 1
+                endif
+            endif
+        endif
+
+        " if we're in a code block or front matter
+        if b:fenced_block == 1 || b:front_matter == 1
+            if a:lnum == 1
+                " fold any 'preamble'
+                return '>1'
+            else
+                " keep previous foldlevel
+                return '='
+            endif
+        endif
+
+        let l2 = getline(a:lnum+1)
+        " if the next line starts with two or more '='
+        " and is not code
+        if l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
+            " next line is underlined (level 1)
+            return '>0'
+        " else, if the nex line starts with two or more '-'
+        " and is not code
+        elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
+            " next line is underlined (level 2)
+            return '>1'
+        endif
+
+        "if we're on a non-code line starting with a pound sign
+        if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
+            " set the fold level to the number of hashes -1
+            " return '>'.(matchend(l1, '^#\+') - 1)
+            " set the fold level to the number of hashes
+            return '>'.(matchend(l1, '^#\+'))
+        " else, if we're on line 1
+        elseif a:lnum == 1
+            " fold any 'preamble'
+            return '>1'
+        else
+            " keep previous foldlevel
+            return '='
+        endif
+    endfunction
+
+    function! Foldtext_markdown()
+        let line = getline(v:foldstart)
+        let has_numbers = &number || &relativenumber
+        let nucolwidth = &fdc + has_numbers * &numberwidth
+        let windowwidth = winwidth(0) - nucolwidth - 6
+        let foldedlinecount = v:foldend - v:foldstart
+        let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
+        let line = substitute(line, '\%("""\|''''''\)', '', '')
+        let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
+        return line . ' ' . repeat("-", fillcharcount) . ' ' . foldedlinecount
+    endfunction
+else " vim_markdown_folding_style_pythonic == 0
+    function! Foldexpr_markdown(lnum)
+        if (a:lnum == 1)
+            let l0 = ''
+        else
+            let l0 = getline(a:lnum-1)
+        endif
+
+        " keep track of fenced code blocks
+        if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
+            if b:fenced_block == 0
+                let b:fenced_block = 1
+            elseif b:fenced_block == 1
+                let b:fenced_block = 0
+            endif
+        elseif g:vim_markdown_frontmatter == 1
+            if b:front_matter == 1
+                if l0 == '---'
+                    let b:front_matter = 0
+                endif
+            elseif a:lnum == 2
+                if l0 == '---'
+                    let b:front_matter = 1
+                endif
+            endif
+        endif
+
+        if b:fenced_block == 1 || b:front_matter == 1
+            " keep previous foldlevel
+            return '='
+        endif
 
-    if (a:lnum == 1)
-        let l0 = ''
-    else
-        let l0 = s:effective_line(a:lnum-1)
+        let l2 = getline(a:lnum+1)
+        if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
+            " next line is underlined (level 1)
+            return '>1'
+        elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
+            " next line is underlined (level 2)
+            if s:vim_markdown_folding_level >= 2
+                return '>1'
+            else
+                return '>2'
+            endif
+        endif
+
+        let l1 = getline(a:lnum)
+        if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
+            " fold level according to option
+            if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
+                if a:lnum == line('$')
+                    return matchend(l1, '^#\+') - 1
+                else
+                    return -1
+                endif
+            else
+                " headers are not folded
+                return 0
+            endif
+        endif
+
+        if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
+            " previous line starts with hashes
+            return '>'.matchend(l0, '^#\+')
+        else
+            " keep previous foldlevel
+            return '='
+        endif
+    endfunction
+endif
+
+
+let b:fenced_block = 0
+let b:front_matter = 0
+let s:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
+
+function! s:MarkdownSetupFolding()
+    if !get(g:, "vim_markdown_folding_disabled", 0)
+        if get(g:, "vim_markdown_folding_style_pythonic", 0)
+            if get(g:, "vim_markdown_override_foldtext", 1)
+                setlocal foldtext=Foldtext_markdown()
+            endif
+        endif
+        setlocal foldexpr=Foldexpr_markdown(v:lnum)
+        setlocal foldmethod=expr
     endif
-    if l0 =~ '^#'
-        " current line starts with hashes
-        return '>'.matchend(l0, '^#\+')
-    else
-        " keep previous foldlevel
-        return '='
+endfunction
+
+function! s:MarkdownSetupFoldLevel()
+    if get(g:, "vim_markdown_folding_style_pythonic", 0)
+        " set default foldlevel
+        execute "setlocal foldlevel=".s:vim_markdown_folding_level
     endif
-endfunc
+endfunction
 
+call s:MarkdownSetupFoldLevel()
+call s:MarkdownSetupFolding()
 
-if !get(g:, "vim_markdown_folding_disabled", 0)
-  setlocal foldexpr=Foldexpr_markdown(v:lnum)
-  setlocal foldmethod=expr
-endif
+augroup Mkd
+    " These autocmds need to be kept in sync with the autocmds calling
+    " s:MarkdownRefreshSyntax in ftplugin/markdown.vim.
+    autocmd BufWinEnter,BufWritePost <buffer> call s:MarkdownSetupFolding()
+    autocmd InsertEnter,InsertLeave <buffer> call s:MarkdownSetupFolding()
+    autocmd CursorHold,CursorHoldI <buffer> call s:MarkdownSetupFolding()
+augroup END