ci: lint shell scripts

.github/workflows/lint.yml

@@ -18,3 +18,8 @@ jobs:
         run: |
           sudo apt-get -y install scour
           make lint-svg
+
+      - name: Lint shell scripts
+        run: |
+          sudo apt-get -y install shellcheck
+          make lint-shell

Makefile

@@ -1,6 +1,6 @@
 .PHONY: lint
-lint: lint-c lint-svg
+lint: lint-c lint-shell lint-svg
 
-.PHONY: lint-c lint-svg
-lint-c lint-svg:
+.PHONY: lint-c lint-shell lint-svg
+lint-c lint-shell lint-svg:
 	./$@.sh

lint-shell.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -o errexit -o noclobber -o nounset
+shopt -s globstar
+
+directory="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+git ls-files -z -- "${directory}/**.sh" | xargs --no-run-if-empty --null shellcheck