fix(test-scripts/sh): use $0 instead of $_

[moormaster]

User description

I stumbled accross this while working on #2 .

Fixes an error that occurs when running ./test-scripts/sh:

$ test-scripts/sh
dirname: invalid option -- 'e'
Try 'dirname --help' for more information.
test-scripts/sh: line 4: cd: null directory

After execution of line 3 set -e variable $_ gets overwritten with "set -e".
Line 4 tries to get the dirname for "set -e" and fails.

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PR Type

Bug fix

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Description

• Fix shell script variable reference error

• Replace $_ with $0 for directory resolution

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Diagram Walkthrough

flowchart LR
  A["Script execution"] --> B["set -e command"]
  B --> C["$_ gets overwritten"]
  C --> D["dirname fails with 'invalid option -e'"]
  E["Use $0 instead"] --> F["Correct directory resolution"]

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File Walkthrough

	Relevant files
Bug fix	sh Fix directory resolution variable reference                            test-scripts/sh Replace $_ with $0 in dirname command Fix variable reference that was overwritten by set -e +1/-1

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Summary by CodeRabbit

• Refactor
  • Reworked shell script path resolution to be more robust when invoked from different directories or shells, reducing environment-specific quirks.
• Tests
  • Improved reliability of test scripts by ensuring dependencies are located and loaded correctly regardless of invocation path, helping prevent intermittent failures on CI and local setups. No changes to test coverage or outcomes.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated the shell script to compute its own directory using $0 instead of $_, changing how the relative path to ColorEcho.sh is resolved. No other commands or behaviors were modified; subsequent usage of the dir variable remains the same.

Changes

Cohort / File(s)	Summary of Changes
Shell script dir resolution test-scripts/sh	Replaced directory resolution from $_ to $0 to determine script location; updates the path used to source ColorEcho.sh. No other logic changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title concisely identifies the scope (test-scripts/sh) and describes the key change—using $0 instead of $—which directly matches the pull request’s goal of fixing the script’s directory resolution error caused by $ being overwritten.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d6fd8a0 and c8ae5aa.

📒 Files selected for processing (1)

• test-scripts/sh (1 hunks)

🔇 Additional comments (1)

test-scripts/sh (1)

4-4: Excellent fix!

The change from $_ to $0 correctly resolves the bug. Using $0 is the standard idiom for obtaining a script's path, whereas $_ unreliably holds the last argument of the previous command (in this case, "set -e").

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[gemini-code-assist]

Summary of Changes

Hello @moormaster, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical bug in the test-scripts/sh script that prevented it from executing correctly. The issue stemmed from an unintended side effect of the set -e command, which caused the $_ variable to be overwritten, leading to an invalid directory path being passed to dirname. By switching to $0, the script now reliably identifies its own path, ensuring proper execution and resolving the dirname: invalid option and cd: null directory errors.

Highlights

• Bug Fix: Addresses an issue in the test-scripts/sh script that caused it to fail with dirname: invalid option and cd: null directory errors.
• Script Logic Correction: Replaced the use of the $_ special variable with $0 to correctly determine the script's directory, preventing dirname from receiving an invalid argument after set -e is executed.

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[qodo-merge-for-open-source]

PR Compliance Guide 🔍

Below is a summary of compliance checks for this PR:

Security Compliance
⚪	Path resolution risk Description: Using $0 for dirname can be unsafe if the script is sourced or invoked via a symlink/relative path; consider using a more robust pattern (e.g., resolving via readlink) to avoid path spoofing or incorrect path resolution that could lead to sourcing unintended files. sh [4-4] Referred Code dir="$(cd "$(dirname "$0")" && pwd)" script="${dir}/../dist/ColorEcho.sh"
Ticket Compliance
🟡	🎫 #2 🔴 Explore and list possible support for additional shells: tcsh, dash, sash (Stand-alone shell), wish, and Thompson shell.
Codebase Duplication Compliance
⚪	Codebase context is not defined Follow the guide to enable codebase context checks.
Custom Compliance
⚪	No custom compliance provided Follow the guide to enable custom compliance check.

Compliance status legend

🟢 - Fully Compliant
🟡 - Partial Compliant
🔴 - Not Compliant
⚪ - Requires Further Human Verification
🏷️ - Compliance label

[qodo-merge-for-open-source]

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[gemini-code-assist]

Code Review

This pull request correctly fixes a bug in the test-scripts/sh script caused by using the $_ special variable, which is unreliable after set -e. Replacing it with $0 is the standard and correct approach to get the script's path. I've added one minor suggestion to further improve the robustness of the command. Overall, this is a good fix.

[gemini-code-assist]

This is a good fix. For improved robustness, it's good practice to use -- with dirname to signal the end of options. This prevents dirname from misinterpreting the script path as an option if $0 were to ever begin with a hyphen (-). While this is an unlikely edge case for a script name, it's a good defensive programming habit. I've noticed other scripts in test-scripts/ don't use this; it might be worth considering applying this pattern consistently for better robustness.

dir="$(cd "$(dirname -- "$0")" && pwd)"