1 files changed, 92 insertions, 0 deletions
diff --git a/runtime/indent/graphql.vim b/runtime/indent/graphql.vim
new file mode 100644
index 0000000000..dc0769b9a8
--- /dev/null
+++ b/runtime/indent/graphql.vim
@@ -0,0 +1,92 @@
+" Vim indent file
+" Language:	graphql
+" Maintainer:	Jon Parise <jon@indelible.org>
+" Filenames:	*.graphql *.graphqls *.gql
+" URL:		https://github.com/jparise/vim-graphql
+" License:	MIT <https://opensource.org/license/mit>
+" Last Change:	2024 Dec 21
+
+" Set our local options if indentation hasn't already been set up.
+" This generally means we've been detected as the primary filetype.
+if !exists('b:did_indent')
+  setlocal autoindent
+  setlocal nocindent
+  setlocal nolisp
+  setlocal nosmartindent
+
+  setlocal indentexpr=GetGraphQLIndent()
+  setlocal indentkeys=0{,0},0),0[,0],0#,!^F,o,O
+
+  let b:did_indent = 1
+endif
+
+" 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
+
+" searchpair() skip expression that matches in comments and strings.
+let s:pair_skip_expr =
+  \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "comment\\|string"'
+
+" 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') ==# '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
+
+  " If the previous line isn't GraphQL, assume we're part of a template
+  " string and indent this new line within it.
+  let l:stack = map(synstack(l:prevlnum, 1), "synIDattr(v:val, 'name')")
+  if get(l:stack, -1) !~# '^graphql'
+    return indent(l:prevlnum) + shiftwidth()
+  endif
+
+  let l:line = getline(v:lnum)
+
+  " If this line contains just a closing bracket, find its matching opening
+  " bracket and indent the closing bracket to match.
+  let l:col = matchend(l:line, '^\s*[]})]')
+  if l:col > 0 && !s:InString(v:lnum, l:col)
+    call cursor(v:lnum, l:col)
+
+    let l:bracket = l:line[l:col - 1]
+    if l:bracket ==# '}'
+      let l:matched = searchpair('{', '', '}', 'bW', s:pair_skip_expr)
+    elseif l:bracket ==# ']'
+      let l:matched = searchpair('\[', '', '\]', 'bW', s:pair_skip_expr)
+    elseif l:bracket ==# ')'
+      let l:matched = searchpair('(', '', ')', 'bW', s:pair_skip_expr)
+    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 ended with an opening bracket, indent this line.
+  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