indents(c): add zero_indent for #if

lua/nvim-treesitter/indent.lua

@@ -35,6 +35,7 @@ local get_indents = tsutils.memoize_by_buf_tick(function(bufnr, root, lang)
     branch = {},
     ignore = {},
     aligned_indent = {},
+    zero_indent = {},
   }
 
   for name, node, metadata in queries.iter_captures(bufnr, "indents", root, lang) do
@@ -88,6 +89,10 @@ function M.get_indent(lnum)
   -- tracks to ensure multiple indent levels are not applied for same line
   local is_processed_by_row = {}
 
+  if q.zero_indent[node:id()] then
+    return 0
+  end
+
   while node do
     -- do 'autoindent' if not marked as @indent
     if not q.indent[node:id()] and q.auto[node:id()] and node:start() < lnum - 1 and lnum - 1 <= node:end_() then

queries/c/indents.scm

@@ -26,16 +26,20 @@
 
 (compound_statement "}" @indent_end)
 
+[
+  "else"
+  ")"
+  "}"
+  (statement_identifier)
+] @branch
+
 [
   "#define"
   "#ifdef"
   "#if"
   "#else"
-  "else"
   "#endif"
-  ")"
+] @zero_indent
-  "}"
-] @branch
 
 [
   (preproc_arg)
@@ -47,7 +51,7 @@
 ([(argument_list) (parameter_list)] @aligned_indent
   (#set! "delimiter" "()"))
 
-([ (ERROR) (comment) ] @aligned_indent
+((comment) @aligned_indent
  (#lua-match? @aligned_indent "^/\*"))
 ((comment) @ignore
  (#lua-match? @ignore "^//"))

tests/indent/c/aligned_indent.c

@@ -5,6 +5,3 @@ void foo(int a,
 void foo(int a,
          int b
 
-
-
-

tests/indent/c/comment.c

@@ -6,6 +6,3 @@
 void foo(int *x, int y) {
     *x = y;
 }
-
-/*
- *

tests/indent/c/unfinished_comment.c

@@ -0,0 +1,2 @@
+/*
+ *

tests/indent/c_spec.lua

@@ -13,7 +13,7 @@ describe("indent C:", function()
     runner:whole_file(".", {
       expected_failures = {
         "./preproc_func.c",
-        "./label.c",
+        "./unfinished_comment.c",
       },
     })
   end)

tests/indent/cpp_spec.lua

@@ -16,7 +16,7 @@ describe("indent C++:", function()
       expected_failures = {
         -- C
         "c/preproc_func.c",
-        "c/label.c",
+        "c/unfinished_comment.c",
       },
     })
   end)