git-co: guard numeric validation before integer comparison on branch selection

[Copilot]

Non-numeric input at the interactive branch-selection prompt (e.g. q, abc) causes Bash to emit [: abc: integer expression expected because $selection is passed directly to [ "$selection" -gt 0 ].

Change

Replace the -n emptiness check with a digit-only regex guard:

# Before
if [ -n "$selection" ] && [ "$selection" -gt 0 ]; then

# After
if [[ "$selection" =~ ^[0-9]+$ ]] && [ "$selection" -gt 0 ]; then

The =~ ^[0-9]+$ pattern ensures $selection contains only digits before the integer comparison is evaluated, silently discarding any non-numeric input rather than surfacing a confusing shell error.

Original prompt

git-co: validate branch selection input is numeric

File to modify: git-co

Problem

In the interactive menu (multi-match branch of co()), user input is used directly in an integer comparison:

if [ -n "$selection" ] && [ "$selection" -gt 0 ]; then

If the user types a non-numeric string (e.g. q, abc), Bash will print:

[: abc: integer expression expected

Fix

Add a numeric validation guard before the integer comparison. Replace:

          if [ -n "$selection" ] && [ "$selection" -gt 0 ]; then

with:

          if [[ "$selection" =~ ^[0-9]+$ ]] && [ "$selection" -gt 0 ]; then

This ensures $selection is a non-empty string of digits before doing the integer comparison. No other changes.

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Assistant: All 10 pull requests have been submitted to mlutonsky/utils. Here's a summary of what was created:

#	PR Title	What it does
1	Add MIT license	Adds a LICENSE file so users know they can freely use and adapt the scripts
2	Add ShellCheck CI workflow	Adds .github/workflows/shellcheck.yml to automatically lint all shell scripts on every push and PR
3	git-branch-clean: safer branch deletion and fetch error handling	Switches git branch -D → git branch -d and adds an exit guard on git fetch --prune
4	git-co: fix expensive per-branch python3 Levenshtein loop	Batches all branch names into a single python3 call instead of spawning one process per branch
5	git-co: remove unnecessary git pull --all	Removes the redundant git pull --all after git switch -c, which already sets up tracking
6	git-co: validate branch selection input is numeric	Adds [[ "$selection" =~ ^[0-9]+$ ]] guard to prevent a cryptic Bash error on non-numeric input
7	idle-power-manager: add log rotation	Adds a rotate_log function and MAX_LOG_LINES env var to cap the log file at 10,000 lines
8	idle-power-manager: fix fragile switch_profile success detection	Checks the gdbus call exit code directly instead of grepping stdout for the string "true"
9	idle-power-manager: add DBUS_SESSION_BUS_ADDRESS fallback	Exports a fallback socket path so the script works reliably as a systemd user service
10	Add install.sh	Adds a one-shot install ...

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[Copilot]

Pull request overview

Updates git-co’s interactive branch-selection prompt to avoid Bash “integer expression expected” errors by validating that user input is numeric before performing an integer comparison.

Changes:

• Add a digit-only regex guard ([[ ... =~ ^[0-9]+$ ]]) before [ "$selection" -gt 0 ] in the branch selection menu.

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