Add YAML ftplugin for showing the current line's hierarchy within a yaml document

1 files changed, 49 insertions, 0 deletions

diff --git a/.vim/ftplugin/yaml.vim b/.vim/ftplugin/yaml.vim
index 0c0c07f..ae4ce66 100644
--- a/.vim/ftplugin/yaml.vim
+++ b/.vim/ftplugin/yaml.vim
@@ -1,3 +1,52 @@
 set shiftwidth=2
 set tabstop=2
 set expandtab
+
+function! GetAncestors(line)
+  if(indent(a:line) == 0 && a:line == 1)
+    return ''
+  endif
+
+  if(indent(a:line) == 0 && a:line > 1)
+    if(getline(a:line) !~ '^\s*$') " not an empty line
+      return ''
+    else
+      " sometimes there are newlines within a multiline key
+      return GetAncestors(a:line-1) " return ancestors of previous line
+    endif
+  endif
+
+  let lowerIndent = indent(a:line)-1
+  " check if line is part of a list
+  let isList = ''
+  if(getline(a:line) =~# '^\s*-')
+    let isList = '[]'
+    " find the first key above this in the file that has is not a list member
+    let lastKeyLine = search('^\s\{0,'.indent(a:line).'}[^-]\S\+:', 'bnW')
+  else
+    " find the first key above this in the file that has a lower indent or a
+    " containing list member
+    let lastKeyLine = search('^\s\{0,'.lowerIndent.'}\(\S\+\|-\s\S\+\):', 'bnW')
+    let lastKeyLineContent = getline(lastKeyLine)
+    " check if the containing key is not a member of the same object
+    if(lastKeyLineContent =~# ':\s.\+$' && lastKeyLineContent =~# '^\s*-')
+      let lastKeyLine = search('^\s\{0,'.lowerIndent.'}\(\S\+\|-\s\S\+\):\s*$', 'zbnW')
+      let isList = '[]'
+    endif
+  endif
+
+  let key = matchstr(getline(lastKeyLine), '\s*[\-]\?\s*\zs.\+\ze:').isList
+
+  if(indent(lastKeyLine) > 0)
+    return GetAncestors(lastKeyLine).' . '.key
+  endif
+
+  return key
+endfunction
+
+augroup YamlRevealer
+	au!
+	if(&filetype =~# 'yaml')
+		autocmd CursorMoved <buffer> redraw | echo GetAncestors(line('.'))
+	endif
+aug END