main.sh: add proper command line parameters & usage info

1 files changed, 60 insertions, 10 deletions

diff --git a/main.sh b/main.sh
index 7fb4bf6..a6de982 100755
--- a/main.sh
+++ b/main.sh
@@ -15,8 +15,6 @@ readonly _script_dir
 _script_name="$( basename -- "${BASH_SOURCE[0]}" )"
 readonly _script_name
 
-readonly tests_dir="$_script_dir/.."
-
 source "$_script_dir/lib/log.sh"
 
 _test_run_file() {
@@ -58,25 +56,77 @@ _test_run_file() {
     done
 }
 
+_test_usage() {
+    local msg
+    for msg; do
+        echo "$_script_name: $msg"
+    done
+
+    echo "usage: $_script_name [-h|--help] [-d|--dir DIR] [-f|--filter NAME_PATTERN]
+  -h,--help      show this message and exit
+  -d,--dir       directory with tests
+  -f,--filter    only run tests with names matching the pattern (uses fnmatch(3))"
+}
+
+_test_parse_args() {
+    tests_dir="$_script_dir/.."
+    _test_pattern='*'
+
+    while [ "$#" -gt 0 ]; do
+        local key="$1"
+        shift
+
+        case "$key" in
+            -h|--help)
+                _test_usage
+                exit 0
+                ;;
+            -d|--dir|-f|--filter)
+                ;;
+            *)
+                _test_usage "unrecognized parameter: $key" >&2
+                return 1
+                ;;
+        esac
+
+        if [ "$#" -eq 0 ]; then
+            _test_usage "missing argument for parameter: $key" >&2
+            return 1
+        fi
+
+        local value="$1"
+        shift
+
+        case "$key" in
+            -d|--dir)
+                tests_dir="$value"
+                ;;
+            -f|--filter)
+                _test_pattern="$value"
+                ;;
+            *)
+                _test_usage "unrecognized parameter: $key" >&2
+                return 1
+                ;;
+        esac
+    done
+
+    tests_dir="$( realpath -e -- "$tests_dir" )"
+}
+
 _test_main() {
-    if [ "$#" -gt 1 ]; then
-        echo "usage: $_script_name [PATTERN]" >&2
-        return 1
-    fi
+    _test_parse_args "$@"
 
     local -a test_files=()
     local test_file
 
-    local pattern='*'
-    [ "$#" -gt 0 ] && pattern="$1"
-
     find "$tests_dir" \
         -mindepth 1 \
         -maxdepth 1 \
         -type f \
         -regex '.*/tst-.*\.sh$' \
         -regextype posix-basic \
-        -name "$pattern" \
+        -name "$_test_pattern" \
         -printf '%P\0' \
         | sort -z \
         | \