feat: add fold

ftplugin/vue/fold.vim

@@ -0,0 +1,107 @@
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"
+" Config {{{
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+let s:use_foldexpr = !exists("g:vim_vue_plugin_use_foldexpr")
+      \ || g:vim_vue_plugin_use_foldexpr == 1
+"}}}
+
+if !s:use_foldexpr | finish | endif
+
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"
+" Settings {{{
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+setlocal foldmethod=expr
+setlocal foldexpr=GetVueFold(v:lnum)
+"}}}
+
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"
+" Variables {{{
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+let s:empty_line = '\v^\s*$'
+let s:block_end = '\v^\s*}|]|\)'
+let s:vue_tag_start = '\v^\s*\<(script|style|template)' 
+let s:vue_tag_end = '\v^\s*\<\/(script|style|template)' 
+"}}}
+
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"
+" Functions {{{
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+"  see :h fold-expr
+"  value			    meaning
+"  0			        the line is not in a fold
+"  1, 2, ..		    the line is in a fold with this level
+"  -1			        the fold level is undefined, use the fold level of a
+"			            line before or after this line, whichever is the
+"			            lowest.
+"  "="			      use fold level from the previous line
+"  "a1", "a2", ..	add one, two, .. to the fold level of the previous
+"			            line, use the result for the current line
+"  "s1", "s2", ..	subtract one, two, .. from the fold level of the
+"  ">1", ">2", ..	a fold with this level starts at this line
+"  "<1", "<2", ..	a fold with this level ends at this line
+function! GetVueFold(lnum)
+  let this_line = getline(a:lnum)
+  let next_line = getline(a:lnum + 1)
+  if a:lnum > 1
+    let prev_line = getline(a:lnum - 1)
+  endif
+
+  " Handle empty or comment lines
+  if this_line =~ s:empty_line
+    return -1
+  endif
+  if this_line =~ s:vue_tag_start
+    return '>1'
+  endif
+  if this_line =~ s:vue_tag_end
+    return '<1'
+  endif
+
+  " Use (indentLevel + 1) as fold level
+  let this_indent = s:IndentLevel(a:lnum)
+  let next_indent = s:IndentLevel(s:NextNonBlankLine(a:lnum))
+
+  if a:lnum > 1
+    let prev_indent = s:IndentLevel(a:lnum - 1)
+
+    if this_line =~ s:block_end && (this_indent < prev_indent)
+      return prev_indent
+    endif
+  endif
+
+  if this_indent >= next_indent 
+    return this_indent
+  elseif this_indent < next_indent
+    return '>'.next_indent
+  endif
+endfunction
+
+function! s:IndentLevel(lnum)
+  " Add 1 to enable vue tags to fold
+  return indent(a:lnum) / &shiftwidth + 1
+endfunction
+
+function! s:NextNonBlankLine(lnum)
+  let next_line = a:lnum + 1
+  let last_line = line('$')
+
+  while next_line <= last_line
+    if getline(next_line) =~ '\v\S'
+      return next_line
+    endif
+
+    let next_line += 1
+  endwhile
+
+  return 0
+endfunction
+"}}}
+" vim: fdm=marker