Fix "nothing to commit" error with LF/CRLF changes #241 (#265)

* fix crlf test

* add diff check before commit

* add dirty check flag (not sure if needed)

* Update test name and add more assertions

Update test name to make it clear that the Action no longer fails to detect CRLF changes.

* Add Comment to explain why we use git-diff again

* Add test to confirm content changes are commited

* Closes #241 

Co-authored-by: Stefan Zweifel <hello@stefanzweifel.io>

entrypoint.sh

@@ -25,11 +25,28 @@ _main() {
 
         _add_files
 
-        _local_commit
+        # Check dirty state of repo again using git-diff.
+        # (git-diff detects beter if CRLF of files changes and does NOT
+        # proceed, if only CRLF changes are detected. See #241 and #265
+        # for more details.)
+        if [ -n "$(git diff --staged)" ] || "$INPUT_SKIP_DIRTY_CHECK"; then
+            _local_commit
 
-        _tag_commit
+            _tag_commit
 
-        _push_to_github
+            _push_to_github
+        else
+
+            # Check if $GITHUB_OUTPUT is available
+            # (Feature detection will be removed in late December 2022)
+            if [ -z ${GITHUB_OUTPUT+x} ]; then
+                echo "::set-output name=changes_detected::false";
+            else
+                echo "changes_detected=false" >> $GITHUB_OUTPUT;
+            fi
+
+            echo "Working tree clean. Nothing to commit.";
+        fi
     else
 
         # Check if $GITHUB_OUTPUT is available

tests/git-auto-commit.bats

@@ -974,34 +974,73 @@ cat_github_output() {
     assert_line --partial "another-subdirectory/new-file-3.txt"
 }
 
-@test "fails to detect crlf change in files and does not detect change or commit changes" {
+@test "detects if crlf in files change and does not create commit" {
     # Set autocrlf to true
     cd "${FAKE_LOCAL_REPOSITORY}"
     git config core.autocrlf true
     run git config --get-all core.autocrlf
     assert_line "true"
 
     # Add more .txt files
-    touch "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
-    touch "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
+    echo -ne "crlf test1\r\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
+    echo -ne "crlf test1\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
 
     # Run git-auto-commit to add new files to repository
     run git_auto_commit
 
     # Change control characters in files
-    sed 's/^M$//' "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
-    sed 's/$/^M/' "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
+    echo -ne "crlf test1\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
+    echo -ne "crlf test1\r\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
 
     # Run git-auto-commit to commit the 2 changes files
     run git_auto_commit
 
     assert_success
 
-    # Changes are not detected
+    refute_line --partial "2 files changed, 2 insertions(+), 2 deletions(-)"
+    assert_line --partial "warning: in the working copy of 'new-file-2.txt', LF will be replaced by CRLF the next time Git touches it"
+
     assert_line --partial "Working tree clean. Nothing to commit."
+    assert_line --partial "new-file-2.txt"
+    assert_line --partial "new-file-3.txt"
+
+    # Changes are not detected
+    run cat_github_output
+    assert_line "changes_detected=false"
+}
+
+@test "detects if crlf in files change and creates commit if the actual content of the files change" {
+    # Set autocrlf to true
+    cd "${FAKE_LOCAL_REPOSITORY}"
+    git config core.autocrlf true
+    run git config --get-all core.autocrlf
+    assert_line "true"
+
+    # Add more .txt files
+    echo -ne "crlf test1\r\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
+    echo -ne "crlf test1\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
 
-    refute_line --partial "new-file-2.txt"
-    refute_line --partial "new-file-3.txt"
+    # Run git-auto-commit to add new files to repository
+    run git_auto_commit
+
+    # Change control characters in files
+    echo -ne "crlf test2\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-2.txt
+    echo -ne "crlf test2\r\n" > "${FAKE_LOCAL_REPOSITORY}"/new-file-3.txt
+
+    # Run git-auto-commit to commit the 2 changes files
+    run git_auto_commit
+
+    assert_success
+
+    assert_line --partial "2 files changed, 2 insertions(+), 2 deletions(-)"
+    assert_line --partial "warning: in the working copy of 'new-file-2.txt', LF will be replaced by CRLF the next time Git touches it"
+
+    assert_line --partial "new-file-2.txt"
+    assert_line --partial "new-file-3.txt"
+
+    # Changes are detected
+    run cat_github_output
+    assert_line "changes_detected=true"
 }