[enh] CI - add shell script formatter

Implement rules and functions to format shell scripts:

    $ make format.shell

or alternatively to format all source code:

    $ make format

The formatter `shfmt` reads the rules from the editorconfig[1]

  If any EditorConfig files are found, they will be used to apply formatting
  options.  If any parser or printer flags are given to the tool, no
  EditorConfig files will be used.

[1] https://github.com/patrickvane/shfmt?tab=readme-ov-file#description

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

6 files changed, 47 insertions, 19 deletions

diff --git a/.editorconfig b/.editorconfig
index 6a1922ac7..8c626c425 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -14,6 +14,14 @@ charset = utf-8
 # code formatter accepts length of 120, but editor should prefer 80
 max_line_length = 80
 
+[{*.sh,manage}]
+indent_style = space
+indent_size = 4
+
+# shfmt options
+shell_variant  = bash
+switch_case_indent = true
+
 [*.html]
 # in the jinja templates we use indent size of 2 and we do not use tabs
 indent_size = 2
diff --git a/Makefile b/Makefile
index 4c633e1fc..860b91704 100644
--- a/Makefile
+++ b/Makefile
@@ -47,8 +47,8 @@ search.checker.%: install
 	$(Q)./manage pyenv.cmd searxng-checker -v "$(subst _, ,$(patsubst search.checker.%,%,$@))"
 
 PHONY += test ci.test test.shell
-ci.test: test.yamllint test.black test.types.ci  test.pylint test.unit test.robot test.rst test.shell test.pybabel
-test:    test.yamllint test.black test.types.dev test.pylint test.unit test.robot test.rst test.shell
+ci.test: test.yamllint test.black test.types.ci  test.pylint test.unit test.robot test.rst test.shell test.shfmt test.pybabel
+test:    test.yamllint test.black test.types.dev test.pylint test.unit test.robot test.rst test.shell test.shfmt
 test.shell:
 	$(Q)shellcheck -x -s dash \
 		container/entrypoint.sh
@@ -64,6 +64,8 @@ test.shell:
 		utils/searxng.sh
 	$(Q)$(MTOOLS) build_msg TEST "$@ OK"
 
+PHONY += format
+format: format.python format.shell
 
 # wrap ./manage script
 
@@ -77,8 +79,8 @@ MANAGE += gecko.driver
 MANAGE += node.env node.env.dev node.clean
 MANAGE += py.build py.clean
 MANAGE += pyenv pyenv.install pyenv.uninstall
-MANAGE += format.python
-MANAGE += test.yamllint test.pylint test.black test.pybabel test.unit test.coverage test.robot test.rst test.clean test.themes test.types.dev test.types.ci
+MANAGE += format.python format.shell
+MANAGE += test.yamllint test.pylint test.black test.pybabel test.unit test.coverage test.robot test.rst test.clean test.themes test.types.dev test.types.ci test.shfmt
 MANAGE += themes.all themes.simple themes.fix themes.lint themes.test
 MANAGE += static.build.commit static.build.drop static.build.restore
 MANAGE += nvm.install nvm.clean nvm.status nvm.nodejs
diff --git a/docs/dev/makefile.rst b/docs/dev/makefile.rst
index 4781b2ce6..ea7ddecd8 100644
--- a/docs/dev/makefile.rst
+++ b/docs/dev/makefile.rst
@@ -188,24 +188,22 @@ sources of the theme need to be rebuild.  You can do that by running::
 
     $ LIVE_THEME=simple make run
 
-.. _make format.python:
+.. _make format:
 
-``make format.python``
+``make format``
 ======================
 
-Format Python source code using `Black code style`_.  See ``$BLACK_OPTIONS``
-and ``$BLACK_TARGETS`` in :origin:`Makefile`.
-
-.. attention::
+.. _Black code style:
+   https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html
+.. _shfmt: https://github.com/mvdan/sh?tab=readme-ov-file#shfmt
+.. _EditorConfig: https://github.com/patrickvane/shfmt?tab=readme-ov-file#description
 
-   We stuck at Black 22.12.0, please read comment in PR `Bump black from 22.12.0
-   to 23.1.0`_
+- Format Python source code using `Black code style`_.  See ``$BLACK_OPTIONS``
+  and ``$BLACK_TARGETS`` in :origin:`Makefile`.
 
-.. _Bump black from 22.12.0 to 23.1.0:
-   https://github.com/searxng/searxng/pull/2159#pullrequestreview-1284094735
+- Format Shell scripts using shfmt_. The formatter ``shfmt`` reads the rules
+  from the EditorConfig_ files.
 
-.. _Black code style:
-   https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html
 
 .. _make clean:
 
diff --git a/docs/dev/quickstart.rst b/docs/dev/quickstart.rst
index 1f3fee7cc..305a8686e 100644
--- a/docs/dev/quickstart.rst
+++ b/docs/dev/quickstart.rst
@@ -27,7 +27,7 @@ Here is how a minimal workflow looks like:
 
 1. *start* hacking
 2. *run* your code: :ref:`make run`
-3. *format & test* your code: :ref:`make format.python` and :ref:`make test`
+3. *format & test* your code: :ref:`make format` and :ref:`make test`
 
 If you think at some point something fails, go back to *start*.  Otherwise,
 choose a meaningful commit message and we are happy to receive your pull
diff --git a/manage b/manage
index 7d2305e65..df1c01c21 100755
--- a/manage
+++ b/manage
@@ -64,6 +64,12 @@ RST_FILES=(
     'README.rst'
 )
 
+SHFMT_SCRIPTS=(
+    "./manage"
+    "./container"
+    "./utils"
+)
+
 help() {
     nvm.help
     cat <<EOF
@@ -90,6 +96,7 @@ pyenv.:
   OK        : test if virtualenv is OK
 format.:
   python    : format Python code source using black
+  shell     : format Shell scripts using shfmt
 EOF
     go.help
     node.help
@@ -248,11 +255,17 @@ pyenv.uninstall() {
 }
 
 format.python() {
-    build_msg TEST "[format.python] black \$BLACK_TARGETS"
+    build_msg TEST "[format.python] black ${BLACK_TARGETS[*]}"
     pyenv.cmd black "${BLACK_OPTIONS[@]}" "${BLACK_TARGETS[@]}"
     dump_return $?
 }
 
+format.shell() {
+    build_msg TEST "[shfmt] shfmt ${SHFMT_SCRIPTS[*]}"
+    go.tool shfmt --list --write "${SHFMT_SCRIPTS[@]}"
+    dump_return $?
+}
+
 docs.prebuild() {
     build_msg DOCS "build ${DOCS_BUILD}/includes"
     (
diff --git a/utils/lib_sxng_test.sh b/utils/lib_sxng_test.sh
index 321584bf2..bd3e19651 100755
--- a/utils/lib_sxng_test.sh
+++ b/utils/lib_sxng_test.sh
@@ -6,8 +6,9 @@ test.help(){
 test.:
   yamllint  : lint YAML files (YAMLLINT_FILES)
   pylint    : lint ./searx, ./searxng_extra and ./tests
-  pyright   : static type check of python sources (.dev or .ci)
   black     : check black code format
+  shfmt     : check shfmt code format
+  shfmt     : check Shell script code format
   unit      : run unit tests
   coverage  : run unit tests with coverage
   robot     : run robot test
@@ -105,6 +106,12 @@ test.black() {
     dump_return $?
 }
 
+test.shfmt() {
+    build_msg TEST "[shfmt] ${SHFMT_SCRIPTS[*]}"
+    go.tool shfmt --list --diff "${SHFMT_SCRIPTS[@]}"
+    dump_return $?
+}
+
 test.unit() {
     build_msg TEST 'tests/unit'
     # shellcheck disable=SC2086