From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Thu, 19 Jun 2014 08:58:18 +0000 (+0200)
Subject: Merge pull request #88 from cirosantilli/change-header-level
X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/3d76a59bd0faf62ad280b9ea82117e4a0425c61f?hp=7b213323a86d88810aa2f97f15f5079c67cf3d48

Merge pull request #88 from cirosantilli/change-header-level

Add commands to increase and decrease header levels.
---

diff --git a/README.md b/README.md
index 1c5b246..7d75420 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,24 @@ The following work on normal and visual modes:
 - `:Toct`: Same as `:Toc` but in a new tab.
 - `:Tocv`: Same as `:Toc` for symmetry with `:Toch` and `Tocv`.
 
+- `:SetexToAtx`:
+
+    Convert all Setex style headers in buffer to Atx.
+
+    If a range is given, e.g. hit `:` from visual mode, only operate on the range.
+
+- `:HeaderDecrease`:
+
+    Decrease level of all headers in buffer: `h2` to `h1`, `h3` to `h2`, etc.
+
+    If range is given, only operate in the range.
+
+    If an `h1` would be decreased, abort.
+
+    For simplicity of implementation, Setex headers are converted to Atx.
+
+- `:HeaderIncrease`: Analogous to `:HeaderDecrease`, but increase levels instead.
+
 ## Credits
 
 The main contributors of vim-markdown are:
diff --git a/ftplugin/mkd.vim b/ftplugin/mkd.vim
index ee861e7..2129203 100644
--- a/ftplugin/mkd.vim
+++ b/ftplugin/mkd.vim
@@ -358,6 +358,43 @@ function! s:MapNormVis(rhs,lhs)
     execute 'vn <buffer><silent> ' . a:rhs . ' <esc>:call <sid>VisMove(''' . a:lhs . ''')<cr>'
 endfunction
 
+" Convert Setex headers in range `line1 .. line2` to Atx.
+" Returns the number of conversions.
+function! s:SetexToAtx(line1, line2)
+    let l:originalNumLines = line('$')
+    execute 'silent! ' . a:line1 . ',' . a:line2 . 'substitute/\v(.*\S.*)\n\=+$/# \1/'
+    execute 'silent! ' . a:line1 . ',' . a:line2 . 'substitute/\v(.*\S.*)\n-+$/## \1/'
+    return l:originalNumLines - line('$')
+endfunction
+
+" If `a:1` is 0, decrease the level of all headers in range `line1 .. line2`.
+" Otherwise, increase the level. `a:1` defaults to `0`.
+function! s:HeaderDecrease(line1, line2, ...)
+    if a:0 > 0
+        let l:increase = a:1
+    else
+        let l:increase = 0
+    endif
+    if l:increase
+        let l:forbiddenLevel = 6
+        let l:replaceLevels = [5, 1]
+        let l:levelDelta = 1
+    else
+        let l:forbiddenLevel = 1
+        let l:replaceLevels = [2, 6]
+        let l:levelDelta = -1
+    endif
+    for l:line in range(a:line1, a:line2)
+        if join(getline(l:line, l:line + 1), "\n") =~ s:levelRegexpDict[l:forbiddenLevel]
+            echomsg 'There is an h' . l:forbiddenLevel . ' at line ' . l:line . '. Aborting.'
+            return
+        endif
+    endfor
+    let l:numSubstitutions = s:SetexToAtx(a:line1, a:line2)
+    for l:level in range(replaceLevels[0], replaceLevels[1], -l:levelDelta)
+        execute 'silent! ' . a:line1 . ',' . (a:line2 - l:numSubstitutions) . 'substitute/' . s:levelRegexpDict[l:level] . '/' . repeat('#', l:level + l:levelDelta) . '\1/g'
+    endfor
+endfunction
 
 call <sid>MapNormVis('<Plug>(Markdown_MoveToNextHeader)', '<sid>Markdown_MoveToNextHeader')
 call <sid>MapNormVis('<Plug>(Markdown_MoveToPreviousHeader)', '<sid>Markdown_MoveToPreviousHeader')
@@ -388,3 +425,6 @@ command! -buffer Toc call s:Markdown_Toc()
 command! -buffer Toch call s:Markdown_Toc('horizontal')
 command! -buffer Tocv call s:Markdown_Toc('vertical')
 command! -buffer Toct call s:Markdown_Toc('tab')
+command! -buffer -range=% SetexToAtx call s:SetexToAtx(<line1>, <line2>)
+command! -buffer -range=% HeaderDecrease call s:HeaderDecrease(<line1>, <line2>)
+command! -buffer -range=% HeaderIncrease call s:HeaderDecrease(<line1>, <line2>, 1)