feat(bash): add indents query

It's pretty basic at the moment but already makes working with bash
scripts way easier.

SUPPORTED_LANGUAGES.md

@@ -20,7 +20,7 @@ Language | Tier | Queries | Maintainer
 [astro](https://github.com/virchau13/tree-sitter-astro) | unstable | `HFIJL` | @virchau13
 [authzed](https://github.com/mleonidas/tree-sitter-authzed) | unstable | `H  J ` | @mattpolzin
 [awk](https://github.com/Beaglefoot/tree-sitter-awk) | unstable | `H  J ` | 
-[bash](https://github.com/tree-sitter/tree-sitter-bash) | unstable | `HF JL` | @TravonteD
+[bash](https://github.com/tree-sitter/tree-sitter-bash) | unstable | `HFIJL` | @TravonteD
 [bass](https://github.com/vito/tree-sitter-bass) | unstable | `HFIJL` | @amaanq
 [beancount](https://github.com/polarmutex/tree-sitter-beancount) | unmaintained | `HF J ` | @polarmutex
 [bibtex](https://github.com/latex-lsp/tree-sitter-bibtex) | unstable | `HFIJ ` | @theHamsta, @clason

runtime/queries/bash/indents.scm

@@ -0,0 +1,32 @@
+[
+  (if_statement)
+  (for_statement)
+  (while_statement)
+  (case_statement)
+  (function_definition)
+  (compound_statement)
+  (subshell)
+  (command_substitution)
+  (do_group)
+  (case_item)
+] @indent.begin
+
+[
+  "fi"
+  "done"
+  "esac"
+  "}"
+  ")"
+  "then"
+  "do"
+  (elif_clause)
+  (else_clause)
+] @indent.branch
+
+[
+  "fi"
+  "done"
+  "esac"
+  "}"
+  ")"
+] @indent.end

tests/indent/bash/test.sh

@@ -0,0 +1,39 @@
+for i in 1 2 3; do
+    if [[ true ]]; then
+        echo "asd"
+    elif [ true ]; then
+        echo "dsa"
+    else
+        echo ""
+    fi
+    echo $i
+done
+
+while true; do
+    break
+done
+
+case $foo in
+    a) echo a ;;
+    b) echo b ;;
+esac
+
+function x() {
+    echo x
+}
+
+y() {
+    echo y
+}
+
+{
+    echo z
+}
+
+(
+    echo subshell
+)
+
+A=$(
+    echo command substitution
+)

tests/indent/bash_spec.lua

@@ -0,0 +1,33 @@
+local Runner = require('tests.indent.common').Runner
+local XFAIL = require('tests.indent.common').XFAIL
+
+local run = Runner:new(it, 'tests/indent/bash', {
+  tabstop = 4,
+  shiftwidth = 4,
+  softtabstop = 0,
+  expandtab = true,
+})
+
+describe('indent Bash:', function()
+  describe('whole file:', function()
+    run:whole_file('.', {
+      expected_failures = {},
+    })
+  end)
+
+  describe('new line:', function()
+    run:new_line('test.sh', { on_line = 1, text = 'echo test', indent = 4 }) -- in "for"
+    run:new_line('test.sh', { on_line = 2, text = 'echo test', indent = 8 }) -- in "if"
+    run:new_line('test.sh', { on_line = 4, text = 'echo test', indent = 8 }) -- in "elif"
+    run:new_line('test.sh', { on_line = 6, text = 'echo test', indent = 8 }) -- in "else"
+    run:new_line('test.sh', { on_line = 8, text = 'echo test', indent = 4 }) -- after "fi"
+    run:new_line('test.sh', { on_line = 12, text = 'echo test', indent = 4 }) -- in "while"
+    run:new_line('test.sh', { on_line = 18, text = 'c) echo test ;;', indent = 4 }) -- in "case"
+    run:new_line('test.sh', { on_line = 21, text = 'echo test', indent = 4 }) -- in "function"
+    run:new_line('test.sh', { on_line = 25, text = 'echo test', indent = 4 }) -- in "f() { ... }"
+    run:new_line('test.sh', { on_line = 29, text = 'echo test', indent = 4 }) -- in "{ ... }"
+    run:new_line('test.sh', { on_line = 33, text = 'echo test', indent = 4 }) -- in subshell
+    run:new_line('test.sh', { on_line = 37, text = 'echo test', indent = 4 }) -- in command substitution
+    run:new_line('test.sh', { on_line = 39, text = 'echo test', indent = 0 })
+  end)
+end)