Indentation rework (#1562)

* WIP: Rework indentation system

* Add ComplexNode for context-aware indentation (including a proof of concept for assignment statements in rust)

* Add switch statements to Go indents.toml (fixes the second half of issue #1523)
Remove commented-out code

* Migrate all existing indentation queries.
Add more options to ComplexNode and use them to improve C/C++ indentation.

* Add comments & replace Option<Vec<_>> with Vec<_>

* Add more detailed documentation for tree-sitter indentation

* Improve code style in indent.rs

* Use tree-sitter queries for indentation instead of TOML config.
Migrate existing indent queries.

* Add documentation for the new indent queries.
Change xtask docgen to look for indents.scm instead of indents.toml

* Improve code style in indent.rs.
Fix an issue with the rust indent query.

* Move indentation test sources to separate files.
Add `#not-kind-eq?`, `#same-line?` and `#not-same-line` custom predicates.
Improve the rust and c indent queries.

* Fix indent test.
Improve rust indent queries.

* Move indentation tests to integration test folder.

* Improve code style in indent.rs.
Reuse tree-sitter cursors for indentation queries.

* Migrate HCL indent query

* Replace custom loading in indent tests with a designated languages.toml

* Update indent query file name for --health command.

* Fix single-space formatting in indent queries.

* Add explanation for unwrapping.

Co-authored-by: Triton171 <triton0171@gmail.com>

2 files changed, 33 insertions, 16 deletions

diff --git a/runtime/queries/c/indents.scm b/runtime/queries/c/indents.scm
new file mode 100644
index 00000000..353ea81b
--- /dev/null
+++ b/runtime/queries/c/indents.scm
@@ -0,0 +1,33 @@
+[
+  (compound_statement)
+  (field_declaration_list)
+  (enumerator_list)
+  (parameter_list)
+  (init_declarator)
+  (case_statement)
+  (expression_statement)
+] @indent
+
+[
+  "case"
+  "}"
+  "]"
+] @outdent
+
+(if_statement
+  consequence: (_) @indent
+  (#not-kind-eq? @indent "compound_statement")
+  (#set! "scope" "all"))
+(while_statement
+  body: (_) @indent
+  (#not-kind-eq? @indent "compound_statement")
+  (#set! "scope" "all"))
+(do_statement
+  body: (_) @indent
+  (#not-kind-eq? @indent "compound_statement")
+  (#set! "scope" "all"))
+(for_statement
+  ")"
+  (_) @indent
+  (#not-kind-eq? @indent "compound_statement")
+  (#set! "scope" "all"))
diff --git a/runtime/queries/c/indents.toml b/runtime/queries/c/indents.toml
deleted file mode 100644
index f4076e17..00000000
--- a/runtime/queries/c/indents.toml
+++ /dev/null
@@ -1,16 +0,0 @@
-indent = [
-  "compound_statement",
-  "field_declaration_list",
-  "enumerator_list",
-  "parameter_list",
-  "init_declarator",
-  "case_statement",
-  "condition_clause",
-  "expression_statement",
-]
-
-outdent = [
-  "case",
-  "}",
-  "]",
-]