Add GitHub Actions workflow config

First pass; this could probably be better - e.g. test across multiple
shell intalls in each environment. But, eh, all in good time.

Author: mcinglis

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: ci.yml
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch: # Allows manual triggering
+
+jobs:
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false # Continue testing other platforms even if one fails
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Display environment
+      run: |
+        echo "Runner OS: ${{ runner.os }}"
+        echo "Matrix OS: ${{ matrix.os }}"
+        if command -v uname >/dev/null 2>&1; then
+          echo "System: $(uname -a)"
+        fi
+        echo "Shell: $0"
+        echo "Working directory: $(pwd)"
+        echo "User: $(whoami)"
+    - name: Run ./ff-test
+      run: ./ff-test
+
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Install shellcheck
+      run: |
+        sudo apt-get update
+        sudo apt-get install --assume-yes --no-install-recommends shellcheck
+    - name: Run shellcheck
+      run: shellcheck --shell=sh ./ff ./ff-test

ff-test

@@ -39,7 +39,6 @@ fi
 TESTS_RUN=0
 TESTS_PASSED=0
 TESTS_FAILED=0
-TEST_FAILURES=""
 
 run_test() {
     # Parse arguments:
@@ -74,16 +73,20 @@ run_test() {
                 ;;
         esac
     done
+
     # Print test pre-amble:
     TESTS_RUN=$((TESTS_RUN + 1))
+
     # Run command and capture its stdout, stderr and exit code:
     _stdout_file="$(mktemp)"
     _stderr_file="$(mktemp)"
     _exit_code=0
     eval "$_test_command" >"$_stdout_file" 2>"$_stderr_file" || _exit_code=$?
+
     # Check the command's output:
-    _test_stdout="$(cat "$_stdout_file")"
+    _test_stdout="$(LC_COLLATE=C sort < "$_stdout_file")"
     _test_stderr="$(cat "$_stderr_file")"
+
     _test_passed=true
     _failure_reason=""
     # Check stdout - either exact match or pattern match:
@@ -183,39 +186,39 @@ cleanup_test_dir() {
 test_basic_functionality() {
     run_test "List specific file" "$FF_PATH file1.txt" --stdout "./file1.txt"
     run_test "Simple pattern - just script files" "$FF_PATH script" --stdout "./script.sh"
-    run_test "Pattern with extension" "$FF_PATH '*.py'" --stdout "./file2.py
-./dir1/subdir1/deep_file.py"
+    run_test "Pattern with extension" "$FF_PATH '*.py'" --stdout "./dir1/subdir1/deep_file.py
+./file2.py"
     run_test "Pattern with glob" "$FF_PATH 'config*'" --stdout "./config"
-    run_test "All files with 'file' in name" "$FF_PATH -d 2 file" --stdout "./file1.txt
-./file2.py
-./file3.log
+    run_test "All files with 'file' in name" "$FF_PATH -d 2 file" --stdout "./dir1/nested_file.txt
+./dir2/another_file.log
 ./file with spaces.txt
 ./file-with-dashes.txt
+./file1.txt
+./file2.py
+./file3.log
 ./file_with_underscores.txt
-./dir1/nested_file.txt
-./dir2/another_file.log
 ./link_to_file1"
 }
 
 test_options() {
-    run_test "Hidden files included" "$FF_PATH -H hidden" --stdout "./.hidden_file
-./.hidden_dir"
+    run_test "Hidden files included" "$FF_PATH -H hidden" --stdout "./.hidden_dir
+./.hidden_file"
     run_test "Hidden files excluded by default" "$FF_PATH hidden" --stdout ""
     run_test "Type file - limited to specific files" "$FF_PATH -t f -e txt file1" --stdout "./file1.txt"
     run_test "Type directory" "$FF_PATH -t d dir" --stdout "./dir1
 ./dir1/subdir1
 ./dir2
 ./dir2/subdir2"
-    run_test "Extension py" "$FF_PATH -e py" --stdout "./file2.py
-./dir1/subdir1/deep_file.py"
+    run_test "Extension py" "$FF_PATH -e py" --stdout "./dir1/subdir1/deep_file.py
+./file2.py"
     run_test "Extension txt" "$FF_PATH -e txt file1" --stdout "./file1.txt"
     run_test "Max depth 1" "$FF_PATH -d 1 -t f script" --stdout "./script.sh"
-    run_test "Max depth 2" "$FF_PATH -d 2 nested" --stdout "./dir1/nested_file.txt
-./deep/nested"
+    run_test "Max depth 2" "$FF_PATH -d 2 nested" --stdout "./deep/nested
+./dir1/nested_file.txt"
     run_test "Full path matching" "$FF_PATH -p dir1" --stdout "./dir1
+./dir1/nested_file.txt
 ./dir1/subdir1
 ./dir1/subdir1/deep_file.py
-./dir1/nested_file.txt
 ./link_to_dir1"
     run_test "Exclude pattern - log files" "$FF_PATH -E '*log*' script" --stdout "./script.sh"
     run_test "Follow links" "$FF_PATH -L -t f link" --stdout "./link_to_file1"
@@ -243,8 +246,8 @@ test_color_options() {
 
 test_path_formats() {
     run_test "Absolute paths" "$FF_PATH -a file1.txt" --stdout "$TEST_DIR/file1.txt"
-    run_test "Specific search path" "$FF_PATH file dir1" --stdout "dir1/subdir1/deep_file.py
-dir1/nested_file.txt"
+    run_test "Specific search path" "$FF_PATH file dir1" --stdout "dir1/nested_file.txt
+dir1/subdir1/deep_file.py"
 }
 
 test_complex_scenarios() {