Add ShellCheck CI workflow

[Copilot]

No CI existed in this repo. This adds a GitHub Actions workflow that runs ShellCheck on all shell scripts on every push and PR to main.

Changes

• .github/workflows/shellcheck.yml: New workflow using actions/checkout@v4 + ludeeus/action-shellcheck@master
  • Scripts without .sh extensions (git-co, git-branch-clean, git-branch-close) are passed via additional_files; idle-power-manager.sh is picked up by the action's default scan
  • permissions: contents: read scopes the GITHUB_TOKEN to the minimum required

Original prompt

Add ShellCheck CI workflow

Add a GitHub Actions workflow file at .github/workflows/shellcheck.yml that runs ShellCheck on all shell scripts in the repository on every push and pull request to main.

The workflow should:

• Trigger on push and pull_request targeting main
• Run on ubuntu-latest
• Use actions/checkout@v4 to check out the code
• Use ludeeus/action-shellcheck@master to run ShellCheck
• Target all shell scripts in the repo root: git-co, git-branch-clean, git-branch-close, idle-power-manager.sh

The scripts do not have .sh extensions (except idle-power-manager.sh), so make sure ShellCheck picks them all up — you can set the scandir to . or list files explicitly in the action config.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: How could I improve this repository?

Assistant: Here's a thorough review of your mlutonsky/utils repository with concrete suggestions across several areas:

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🏗️ Repository & Project Structure

1. Add a license
The repo has no license file. Anyone who finds it won't know if they can use or adapt the scripts. A permissive license like MIT takes 30 seconds to add.

2. Add a repository description and topics
The GitHub repo has no description or topics set. Adding a one-line description ("Small shell utilities for git workflow and power management") and topics like shell, bash, git, gnome, productivity makes it more discoverable.

3. Add a top-level install.sh script
Every script currently requires a manual ln -s command. A single install.sh that symlinks all scripts to ~/.local/bin/ would make onboarding much easier.

4. Organize scripts into subdirectories (optional, but worth considering)
As the collection grows, a flat root directory will get cluttered. A structure like git/ and system/ would help.

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🐚 Script Quality & Robustness

git-co

5. Add set -euo pipefail — None of the scripts use strict mode. git-co has numerous subshell calls and variable expansions that could silently fail.

6. Calling python3 in a loop is expensive
_levenshtein_distance() spawns a new python3 process for every branch, which can be very slow on a repo with many branches. Consider inlining the Levenshtein calculation in pure Bash (it's feasible for small strings), or batching all branch names into a single Python invocation.

7. git pull --all after git switch -c is unexpected
After tracking a new remote branch, git pull --all fetches and pulls all remotes, which is likely unintentional. git pull or even nothing (since git switch -c branch origin/branch already sets up tracking) would be more appropriate.

8. Input validation is missing
No check that $selection is actually a number before the -gt 0 comparison — this can produce a cryptic Bash error ([: foo: integer expression expected).

git-branch-clean

9. Uses git branch -D (force delete) instead of -d
-D will delete branches even if they have unmerged commits. Since the intent is to clean up branches whose remote is gone (presumably merged), -d is safer and will warn if something looks wrong.

10. No exit code on fetch failure
If git fetch --prune fails (e.g., no network), the script silently continues and may incorrectly delete branches. It should check the exit code:

git fetch --prune || { echo "fatal: failed to fetch from origin"; exit 1; }

git-branch-close

11. Already solid! This is the most robust of the three git scripts — good use of || { ... ; exit 1; } error handling throughout.

12. Minor: could add a --dry-run flag to preview what would happen without making any changes.

idle-power-manager.sh

13. Log rotation is missing
The log file grows unboundedly. With CHECK_INTERVAL=30 it writes ~2 lines/minute → ~1 MB/day. Consider capping the log size or using logger to send output to systemd journal instead (which journalctl already manages).

14. switch_profile success check is fragile

if echo "$result" | grep -q "true"; then

This would match any string containing "true" (e.g., an error message that says "profile 'true-performance' not found"). Checking the exit code of gdbus call directly would be more reliable.

15. No DBUS_SESSION_BUS_ADDRESS fallback
When run as a systemd user service, DBUS_SESSION_BUS_ADDRESS is usually inherited, but it's not guaranteed. A fallback like:

export DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:-unix:path=/run/user/$(id -u)/bus}"

…would make the service more resilient.

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✅ Testing & CI

16. Add a GitHub Actions workflow
There's no CI at all. Even a simple ShellCheck workflow would catch common bash bugs automatically:

name: ShellCheck
on: [push, pull_request]
job...

</details>



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[mlutonsky]

@copilot When I ran the GH action, it failed on some scripts. Also fix the scripts according to the shellcheck

[Copilot]

Pull request overview

Adds initial CI to the repo by introducing a GitHub Actions workflow that runs ShellCheck against the repository’s shell scripts on pushes and PRs to main.

Changes:

• Add a new GitHub Actions workflow to run ShellCheck on ubuntu-latest.
• Configure the workflow to include non-.sh scripts via additional_files.

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[Copilot]

@copilot When I ran the GH action, it failed on some scripts. Also fix the scripts according to the shellcheck

Fixed in cf45f11. Two issues addressed:

1. Workflow action tag — ludeeus/action-shellcheck@v2.0.0 → @2.0.0 (the release tag has no v prefix, which caused the "unable to find version" error)
2. git-co ShellCheck warnings — fixed all 7 findings:
   • SC2155: split local var=$(...) into separate local var / var=$(...) declarations (6 instances)
   • SC2162: added -r to read to prevent backslash mangling (1 instance)

git-branch-clean, git-branch-close, and idle-power-manager.sh were already clean.