feat(cd): implement cd builtin with -L/-P, cd -, and $HOME support#214

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AlexandreYang wants to merge 18 commits intomainfrom

Commits on May 4, 2026

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AlexandreYang
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feat(cd): implement cd builtin with -L/-P, cd -, and $HOME support
AlexandreYang
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[iter 1] fix(cd): resolve intermediate symlinks under -P; preserve cd's PWD/OLDPWD
AlexandreYang
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[iter 1] test(cd): align scenario error assertions with bash's capitalised messages
AlexandreYang
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[iter 1] fix(cd): filter U+0080 in cd fuzz inputs
AlexandreYang
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[iter 2] fix(cd): cross-platform symlink-loop test, empty HOME/OLDPWD parity, fuzz comment
AlexandreYang
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[iter 2] test(cd): skip Windows tests that interpolate paths into shell scripts
AlexandreYang
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[iter 3] fix: address review comments — comment accuracy, weak assertion, code dedup
AlexandreYang
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[iter 3] test(cd): add stdout_contains_windows for tests asserting path separators
AlexandreYang
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[iter 3] fix(cd): cd "" is a no-op success matching bash
AlexandreYang
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[iter 3] fix(cd): update TestCdEmptyArg and relocate empty_arg scenario
AlexandreYang
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[iter 4] fix(cd): no-op cd cases now update OLDPWD to current directory
AlexandreYang
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[iter 5] fix(cd): cd - with empty OLDPWD prints bare newline; doc and comment fixes
AlexandreYang
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[iter 1] doc(cd): expand cd - description to cover empty-OLDPWD and print semantics
AlexandreYang
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[iter 2] fix(cd): update one-liner doc and add test for cd -P - raw-print invariant
AlexandreYang
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[iter 3] fix(cd): use display="-" for cd - errors; add cd -P - bash scenario
AlexandreYang
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[iter 4] test(cd): add sandbox and intermediate-symlink scenario tests
AlexandreYang
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[iter 5] doc(cd): fix sandbox error description; document CDPATH omission
AlexandreYang
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