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perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762

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perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
Labels
enhancementNew feature or request

Description

@Chemaclass
Chemaclass
opened on Jul 11, 2026

Part of #761.

Problem

Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.

Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.

Task

  1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
  2. In decode_base64, add an early return for empty input so "" never forks.
  3. Audit callers of decode_base64 for other per-test empty decodes.

Tests first (TDD)

  • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
  • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.

Constraints

  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
  • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
  • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).

Acceptance criteria

  • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
  • make sa, make lint pass; shfmt -w . produces no diff.
  • Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
  • Before/after timing of the 100-noop benchmark reported in the PR.

Line references valid at commit 4d80e7c.

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perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
    Skip to content
    perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
    Closed
    Closed
    perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
    Labels
    enhancementNew feature or request
    Description
    @Chemaclass
    Chemaclass
    opened on Jul 11, 2026
    Part of #761.
    Problem
    Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
    Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
    Task
    1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
    2. In decode_base64, add an early return for empty input so "" never forks.
    3. Audit callers of decode_base64 for other per-test empty decodes.
    Tests first (TDD)
    • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
    • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
    Constraints
    • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
    • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
    • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
    Acceptance criteria
    • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
    • make sa, make lint pass; shfmt -w . produces no diff.
    •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
    •  Before/after timing of the 100-noop benchmark reported in the PR.
    Line references valid at commit 4d80e7c.
    Metadata
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    Assignees
    No one assigned
      Labels
      enhancementNew feature or request
      Type
      No type
      Projects
      • bashunit
        Status
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      No branches or pull requests
      Issue actions
      
, 'i');
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perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
      Skip to content
      perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
      Closed
      Closed
      perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
      Labels
      enhancementNew feature or request
      Description
      @Chemaclass
      Chemaclass
      opened on Jul 11, 2026
      Part of #761.
      Problem
      Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
      Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
      Task
      1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
      2. In decode_base64, add an early return for empty input so "" never forks.
      3. Audit callers of decode_base64 for other per-test empty decodes.
      Tests first (TDD)
      • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
      • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
      Constraints
      • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
      • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
      • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
      Acceptance criteria
      • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
      • make sa, make lint pass; shfmt -w . produces no diff.
      •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
      •  Before/after timing of the 100-noop benchmark reported in the PR.
      Line references valid at commit 4d80e7c.
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        enhancementNew feature or request
        Type
        No type
        Projects
        • bashunit
          Status
          Done
        Milestone
        No milestone
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        None yet
        Development
        No branches or pull requests
        Issue actions
        
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
        Skip to content
        perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
        Closed
        Closed
        perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
        Labels
        enhancementNew feature or request
        Description
        @Chemaclass
        Chemaclass
        opened on Jul 11, 2026
        Part of #761.
        Problem
        Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
        Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
        Task
        1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
        2. In decode_base64, add an early return for empty input so "" never forks.
        3. Audit callers of decode_base64 for other per-test empty decodes.
        Tests first (TDD)
        • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
        • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
        Constraints
        • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
        • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
        • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
        Acceptance criteria
        • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
        • make sa, make lint pass; shfmt -w . produces no diff.
        •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
        •  Before/after timing of the 100-noop benchmark reported in the PR.
        Line references valid at commit 4d80e7c.
        Metadata
        Metadata
        Assignees
        No one assigned
          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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try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
          Skip to content
          perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
          Closed
          Closed
          perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
          Labels
          enhancementNew feature or request
          Description
          @Chemaclass
          Chemaclass
          opened on Jul 11, 2026
          Part of #761.
          Problem
          Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
          Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
          Task
          1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
          2. In decode_base64, add an early return for empty input so "" never forks.
          3. Audit callers of decode_base64 for other per-test empty decodes.
          Tests first (TDD)
          • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
          • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
          Constraints
          • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
          • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
          • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
          Acceptance criteria
          • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
          • make sa, make lint pass; shfmt -w . produces no diff.
          •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
          •  Before/after timing of the 100-noop benchmark reported in the PR.
          Line references valid at commit 4d80e7c.
          Metadata
          Metadata
          Assignees
          No one assigned
            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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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
            Skip to content
            perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
            Closed
            Closed
            perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
            Labels
            enhancementNew feature or request
            Description
            @Chemaclass
            Chemaclass
            opened on Jul 11, 2026
            Part of #761.
            Problem
            Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
            Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
            Task
            1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
            2. In decode_base64, add an early return for empty input so "" never forks.
            3. Audit callers of decode_base64 for other per-test empty decodes.
            Tests first (TDD)
            • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
            • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
            Constraints
            • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
            • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
            • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
            Acceptance criteria
            • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
            • make sa, make lint pass; shfmt -w . produces no diff.
            •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
            •  Before/after timing of the 100-noop benchmark reported in the PR.
            Line references valid at commit 4d80e7c.
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
              Skip to content
              perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
              Closed
              Closed
              perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
              Labels
              enhancementNew feature or request
              Description
              @Chemaclass
              Chemaclass
              opened on Jul 11, 2026
              Part of #761.
              Problem
              Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
              Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
              Task
              1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
              2. In decode_base64, add an early return for empty input so "" never forks.
              3. Audit callers of decode_base64 for other per-test empty decodes.
              Tests first (TDD)
              • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
              • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
              Constraints
              • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
              • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
              • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
              Acceptance criteria
              • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
              • make sa, make lint pass; shfmt -w . produces no diff.
              •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
              •  Before/after timing of the 100-noop benchmark reported in the PR.
              Line references valid at commit 4d80e7c.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                enhancementNew feature or request
                Type
                No type
                Projects
                • bashunit
                  Status
                  Done
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                No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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var enabled = true;
function applyDarkMode() {
if (!enabled) return;
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style = document.createElement('style');
style.id = 'universal-dark-mode-style';
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filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
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filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
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[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
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if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
perf(state): avoid base64 forks for empty title and hook message in export_subshell_context · Issue #762 · TypedDevs/bashunit · GitHub
                Skip to content
                perf(state): avoid base64 forks for empty title and hook message in export_subshell_context #762
                Closed
                Closed
                perf(state): avoid base64 forks for empty title and hook message in export_subshell_context#762
                Labels
                enhancementNew feature or request
                Description
                @Chemaclass
                Chemaclass
                opened on Jul 11, 2026
                Part of #761.
                Problem
                Every test run encodes its subshell context once per test in bashunit::state::export_subshell_context (src/state.sh:231-259). It always forks threeecho -n ... | base64 pipelines (src/state.sh:239-246) for _BASHUNIT_TEST_OUTPUT, _BASHUNIT_TEST_TITLE, and _BASHUNIT_TEST_HOOK_MESSAGE, even though title and hook message are empty for almost every test. On the decode side, bashunit::helper::decode_base64 (src/helpers.sh:149) already has a fast path for the _BASHUNIT_EMPTY_ marker, but a plain empty string still forks printf | base64 -d, and bashunit::runner::decode_subshell_output (src/runner.sh:1110) runs once per test.
                Measured cost: each pipeline is ~1.6ms (2 forks) on macOS bash 3.2. That is ~4-5ms per test, ~5s across the ~1160-test suite, and it compounds inside the 258 nested ./bashunit runs in the acceptance suite.
                Task
                1. In export_subshell_context, only fork base64 when the source variable is non-empty; emit an empty string (or the existing _BASHUNIT_EMPTY_ marker, whichever keeps the wire format consistent — check how ##TEST_TITLE=/##TEST_HOOK_MESSAGE= are parsed downstream in src/runner.sh and src/parallel.sh) for empty values. Note echo -n "" | base64 already produces an empty string, so guarding with [ -n "$var" ] should be wire-compatible; verify against the parallel .result file path too (bashunit::runner::parse_result_parallel, src/runner.sh:1441).
                2. In decode_base64, add an early return for empty input so "" never forks.
                3. Audit callers of decode_base64 for other per-test empty decodes.
                Tests first (TDD)
                • Unit tests for encode/decode round-trip: empty string, plain string, multiline string, string with ANSI codes, UTF-8. Follow patterns in tests/unit/helpers_test.sh / existing state tests.
                • Regression: a test with a # @test_title annotation and a hook message still renders correctly (sequential AND --parallel), since those exercise the non-empty paths.
                Constraints
                • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no negative array indexing, no &>>.
                • Wire format of ##ASSERTIONS_*##TEST_* context string must remain parseable by the existing extractors; do not change field order.
                • Keep the Alpine base64 -w 0 branch behavior (src/state.sh:237-241).
                Acceptance criteria
                • ./bashunit tests/ and ./bashunit --parallel tests/ pass.
                • make sa, make lint pass; shfmt -w . produces no diff.
                •  Fork census (see tracking issue) shows base64 count drops from ~4/test to ~2/test for tests without title/hook message.
                •  Before/after timing of the 100-noop benchmark reported in the PR.
                Line references valid at commit 4d80e7c.
                Metadata
                Metadata
                Assignees
                No one assigned
                  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