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perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084

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perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
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Description

@Chemaclass
Chemaclass
opened on Aug 13, 2026

Problem

bashunit::coverage::extract_functions walks a source file line by line in
Bash and counts braces with two ${line//[^\{]/} substitutions per line.
Bash 3.2 pattern substitution over a whole file is the most expensive thing
left in the report phase, and the report calls this once per file per
renderer (report_text, report_lcov, html_file).

Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:

per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms

17.5 ms per file, against a 3.5 ms fork floor.

Proposal

Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md
prescribes for file scans, and the one #1059 already used for the line
classifier. Rules stay identical, quirks included (braces are counted without
regard for strings or comments; changing that moves numbers and belongs in its
own issue).

Result

beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s

Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.

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var __re = new RegExp('^' + "github\\.com" + '
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
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enhancementNew feature or request
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Projects
bashunit
Status
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None yet
Development
No branches or pull requests
Issue actions

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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
Labels
enhancementNew feature or request
Type
No type
Projects
bashunit
Status
Done
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
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var ref = document.referrer;
var terms = [];
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var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
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var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
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highlight(document.body);
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mutations.forEach(function(m) {
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observer.observe(document.body, { childList: true, subtree: true });
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}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
Labels
enhancementNew feature or request
Type
No type
Projects
bashunit
Status
Done
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
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'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
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return url;
}
}
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document.querySelectorAll('a[href]').forEach(function(a) {
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if (clean !== a.href) a.href = clean;
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(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
Labels
enhancementNew feature or request
Type
No type
Projects
bashunit
Status
Done
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
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observer.observe(document.body, { childList: true, subtree: true });
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
Labels
enhancementNew feature or request
Type
No type
Projects
bashunit
Status
Done
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop · Issue #1084 · TypedDevs/bashunit · GitHub
Skip to content
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop #1084
Closed
Closed
perf(coverage): extract function declarations in awk, not a Bash brace-counting loop#1084
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Aug 13, 2026
Problem
bashunit::coverage::extract_functions walks a source file line by line in

Bash and counts braces with two ${line//[^\{]/} substitutions per line.

Bash 3.2 pattern substitution over a whole file is the most expensive thing

left in the report phase, and the report calls this once per file per

renderer (report_text, report_lcov, html_file).
Measured on Bash 3.2 arm64, 128 tracked src/*.sh files, no hits:
per-file helper128 files
extract_functions2238 ms
compute_file_coverage1534 ms
compute_branch_hits1479 ms
awk_lcov_lines440 ms
bare awk fork x128 (the floor)447 ms
17.5 ms per file, against a 3.5 ms fork floor.
Proposal
Same state machine, one awk pass — the shape .claude/rules/perf-fork-budget.md

prescribes for file scans, and the one #1059 already used for the line

classifier. Rules stay identical, quirks included (braces are counted without

regard for strings or comments; changing that moves numbers and belongs in its

own issue).
Result
beforeafter
extract_functions, 128 files2238 ms399 ms
report_lcov, 128 files5052 ms2638 ms
--coverage --coverage-paths src, 1-test file9.23 s6.81 s
Verified byte-identical against the Bash implementation over all 463
git ls-files '*.sh' in the repo, with the differential mutation-checked.
Metadata
Metadata
Assignees
Labels
enhancementNew feature or request
Type
No type
Projects
bashunit
Status
Done
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions