1 files changed, 41 insertions, 0 deletions
diff --git a/.githooks/pre-commit.shellcheck b/.githooks/pre-commit.shellcheck
new file mode 100755
index 0000000..f218922
--- /dev/null
+++ b/.githooks/pre-commit.shellcheck
@@ -0,0 +1,41 @@
+#!/bin/sh
+#
+# Git hook to run ShellCheck.
+#
+# ShellCheck <https://www.shellcheck.net/>
+
+# Treat unset variables as an error when performing parameter expansion.
+set -u
+
+TRUE=0
+FALSE=1
+
+die() {
+  echo "$@" >&2
+  exit 1
+}
+
+if ! command -v shellcheck >/dev/null; then
+  echo 'unable to locate shellcheck' >&2
+  return 0
+fi
+
+success=${TRUE}
+for f in $(git diff --cached --name-only); do
+  # Check for file deletion.
+  if [ ! -r "${f}" ]; then
+    continue
+  fi
+
+  cmd=':'
+  case "${f}" in
+    shflags|shflags_test_helpers) cmd="shellcheck -s sh ${f}" ;;
+    *.sh) cmd="shellcheck ${f}" ;;
+  esac
+  if ! ${cmd}; then
+    success=${FALSE}
+    echo "shellcheck error for '${f}'" >&2
+  fi
+done
+
+exit ${success}