Add shfmt to pre-commit

.pre-commit-config.yaml

@@ -32,6 +32,8 @@ ci:
         - vulture-docs
         - shellcheck
         - shellcheck-docs
+        - shfmt
+        - shfmt-docs
 
 default_install_hook_types: [pre-commit, pre-push, commit-msg]
 repos:
@@ -77,6 +79,19 @@ repos:
       language: system
       types_or: [markdown, rst]
 
+    - id: shfmt
+      name: shfmt
+      entry: shfmt --write
+      language: system
+      pass_filenames: false
+      types_or: [shell]
+
+    - id: shfmt-docs
+      name: shfmt-docs
+      entry: doccmd --language=shell --language=console --no-pad-file --command="shfmt --write"
+      language: system
+      types_or: [markdown, rst]
+
     - id: mypy
       name: mypy
       stages: [push]

pyproject.toml

@@ -65,6 +65,7 @@ optional-dependencies.dev = [
     # but also because having it installed means that ``actionlint-py`` will
     # use it to lint shell commands in GitHub workflow files.
     "shellcheck-py==0.10.0.1",
+    "shfmt-py==3.7.0.1",
     "sphinx==8.0.2",
     "sphinx-copybutton==0.5.2",
     "sphinx-substitution-extensions==2024.8.6",