pre-commit etc: add shfmt

.dir-locals.el

@@ -4,5 +4,7 @@
 ((python-mode
   (eval add-hook 'before-save-hook 'blacken-buffer nil t))
  (sh-mode
+  (mode . shfmt-on-save)
+  (shfmt-arguments "-s")
   (flycheck-sh-bash-args "-O" "extglob")
   (sh-indent-comment . t)))

.editorconfig

@@ -7,6 +7,9 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 max_line_length = 79
+# for shfmt
+function_next_line = true
+switch_case_indent = true
 
 [Makefile.am]
 indent_style = tab

.pre-commit-config.yaml

@@ -30,6 +30,18 @@ repos:
         args: [--config-file=test/setup.cfg]
         # Intentionally not run on helpers/python (support very old versions)
         exclude: completions/
+  - repo: https://github.com/scop/pre-commit-shfmt-workaround
+    rev: v0
+    hooks:
+      - id: shfmt
+        name: shfmt
+        language: golang
+        additional_dependencies: [mvdan.cc/sh/v3/cmd/shfmt@v3.1.1]
+        entry: shfmt
+        args: [-w, -s]
+        types: [text]
+        files: ^(bash_completion|completions/[^.].*|test/update-test-cmd-list|.+\.sh(\.in)?)$
+        exclude: ^completions/Makefile*
   - repo: https://github.com/ryanrhee/shellcheck-py
     rev: v0.7.1.1
     hooks: