Add graphql support, closes #298

1 files changed, 81 insertions, 0 deletions

diff --git a/indent/graphql.vim b/indent/graphql.vim
new file mode 100644
index 00000000..1bf93abb
--- /dev/null
+++ b/indent/graphql.vim
@@ -0,0 +1,81 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'graphql') != -1
+  finish
+endif
+
+" Vim indent file
+" Language: GraphQL
+" Maintainer: Jon Parise <jon@indelible.org>
+
+if exists('b:did_indent')
+  finish
+endif
+let b:did_indent = 1
+
+setlocal autoindent
+setlocal nocindent
+setlocal nolisp
+setlocal nosmartindent
+
+setlocal indentexpr=GetGraphQLIndent()
+setlocal indentkeys=0{,0},0),0[,0],0#,!^F,o,O
+
+" If our indentation function already exists, we have nothing more to do.
+if exists('*GetGraphQLIndent')
+  finish
+endif
+
+let s:cpo_save = &cpoptions
+set cpoptions&vim
+
+" Check if the character at lnum:col is inside a string.
+function s:InString(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') is# 'graphqlString'
+endfunction
+
+function GetGraphQLIndent()
+  " If this is the first non-blank line, we have nothing more to do because
+  " all of our indentation rules are based on matching against earlier lines.
+  let l:prevlnum = prevnonblank(v:lnum - 1)
+  if l:prevlnum == 0
+    return 0
+  endif
+
+  let l:line = getline(v:lnum)
+
+  " If this line contains just a closing bracket, find its matching opening
+  " bracket and indent the closing backet to match.
+  let l:col = matchend(l:line, '^\s*[]})]')
+  if l:col > 0 && !s:InString(v:lnum, l:col)
+    let l:bracket = l:line[l:col - 1]
+    call cursor(v:lnum, l:col)
+
+    if l:bracket is# '}'
+      let l:matched = searchpair('{', '', '}', 'bW')
+    elseif l:bracket is# ']'
+      let l:matched = searchpair('\[', '', '\]', 'bW')
+    elseif l:bracket is# ')'
+      let l:matched = searchpair('(', '', ')', 'bW')
+    else
+      let l:matched = -1
+    endif
+
+    return l:matched > 0 ? indent(l:matched) : virtcol('.') - 1
+  endif
+
+  " If we're inside of a multiline string, continue with the same indentation.
+  if s:InString(v:lnum, matchend(l:line, '^\s*') + 1)
+    return indent(v:lnum)
+  endif
+
+  " If the previous line contained an opening bracket, and we are still in it,
+  " add indent depending on the bracket type.
+  if getline(l:prevlnum) =~# '[[{(]\s*$'
+    return indent(l:prevlnum) + shiftwidth()
+  endif
+
+  " Default to the existing indentation level.
+  return indent(l:prevlnum)
+endfunction
+
+let &cpoptions = s:cpo_save
+unlet s:cpo_save