perf(fish): migrate FORGIT_ vars without spawning subprocesses

[AllanZyne]

What

The backwards-compatibility block in conf.d/forgit.plugin.fish that exports unexported FORGIT_ config variables used a shell pipeline:

set | awk -F ' ' '{ print $1 }' | grep FORGIT_ | while read var
    if not set -x | grep -q "^$var\b"

This forks awk and grep (once for the list, then a grep per variable) on every interactive fish startup. I replaced it with fish's built-in set -n / set -xn + string match, which run in-process:

for var in (set -n | string match -er '^FORGIT_')
    if not set -xn | string match -qr "^$var\$"

Why

Pure startup-speed win — no external processes spawned for this block anymore. On my machine the block's cost dropped from ~2.5ms to ~1.5ms; the real benefit is eliminating the per-variable subprocess fork, which scales with how many FORGIT_ vars a user has set.

Behavior

Unchanged. Verified:

• Unexported FORGIT_ variables are still detected, warned about, and exported.
• Nothing is emitted when all FORGIT_ variables are already exported.

The anchored ^FORGIT_ match on set -n output (one name per line) is equivalent to the previous grep FORGIT_, just without the substring ambiguity.

Testing

• fish conf.d/forgit.plugin.fish — parses clean
• Manual equivalence tests for both the "all exported" (silent) and "unexported var" (warns + migrates) paths
• OS: Linux; shell: fish 4.6.0

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of user-defined FORGIT_ environment settings so they are exported more reliably.
  • Streamlined the check for already-exported settings, which should make startup behavior more consistent.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bfb97f6c-73ab-4e1c-ba20-5ab9586b49ac

📥 Commits

Reviewing files that changed from the base of the PR and between e0c7b84 and f147179.

📒 Files selected for processing (1)

• conf.d/forgit.plugin.fish

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📝 Walkthrough

Walkthrough

The FORGIT_ variable export-detection logic in the Fish plugin config was rewritten to use native Fish built-ins (set -n, set -xn, string match -qr) instead of an external pipeline of set, awk, grep, and while read.

Changes

Variable Export Refactor

Layer / File(s)	Summary
Fish-native FORGIT_ variable export check conf.d/forgit.plugin.fish	Replaced pipeline-based enumeration (set | awk | grep | while read) and export check (set -x | grep -q) with Fish built-ins: set -n filtered by regex ^FORGIT_, and set -xn combined with string match -qr to detect already-exported variables.

Estimated code review effort: 2 (Simple) | ~10 minutes

Compact metadata: Lines changed: +2/-2 | Base: e0c7b84 | Head: f147179

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	It clearly summarizes the fish startup optimization and subprocess removal.
Description check	✅ Passed	It covers the change, motivation, behavior, and testing, but omits the template's checklist and type-of-change fields.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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