perf(coverage): collapse is_executable_line grep calls

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.

[Chemaclass]

🤔 Background

Related #636

Coverage report generation runs bashunit::coverage::is_executable_line on every line of every tracked source file. The previous implementation issued up to seven grep subshells per line, which dominates runtime on slow shells (e.g. Cygwin on legacy hardware where users observed multi-hour runs).

💡 Changes

• Combine the seven non-executable line patterns into a single pre-compiled alternation regex matched in one grep invocation.
• Keep each alternation self-anchored so all existing semantics (comments, function decls, brace-only, control flow keywords, done with redirection/pipe/fd, case patterns, standalone )) are preserved.
• Retain the empty/whitespace-only fast path as a built-in parameter expansion check (no subshell).
• Reporter measured ~3.8x faster coverage generation; existing coverage_executable_test.sh suite passes unchanged.