add shellcheck

Author: programminghoch10

.github/workflows/build.yml

@@ -1,6 +1,9 @@
 name: Build
 
-on: push
+on:
+  push:
+    branches:
+      - '**'
 
 jobs:
   build:

.github/workflows/shellcheck.yml

@@ -0,0 +1,18 @@
+name: ShellCheck
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  check:
+    name: ShellCheck
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install ShellCheck
+        run: sudo apt-get install -y shellcheck
+      - name: Run shellcheck
+        run: ./shellcheck.sh

.shellcheckrc

@@ -0,0 +1,22 @@
+
+# enable additional checks
+enable=add-default-case
+enable=avoid-nullary-conditions
+enable=check-set-e-suppressed
+enable=check-unassigned-uppercase
+enable=deprecate-which
+
+# cd fail
+#  this is usually covered by set -e
+disable=SC2164
+
+# dont follow source files info
+#  we check all shell scripts anyways
+disable=SC1091
+
+# unnecessary arithmetic variables style
+#  i dont care whether it says $(($TODAY)) or $((TODAY))
+disable=SC2004
+
+# redundant sed invocation
+disable=SC2001

shellcheck.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+export IFS=$'\n'
+[ -z "$(command -v shellcheck)" ] && echo "shellcheck not installed!" && exit 1
+shellcheck --version
+
+SHELLCHECK_ARGS=()
+SHELLCHECK_ARGS+=(--wiki-link-count=256)
+
+declare -a FILES
+mapfile -t FILES < <(find . -type f -name '*.sh')
+
+shellcheck \
+  "${SHELLCHECK_ARGS[@]}" \
+  "$@" \
+  "${FILES[@]}"