feat(builtins): add clear, fold, expand/unexpand, envsubst commands#582
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feat(builtins): add clear, fold, expand/unexpand, envsubst commands#582
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- clear: output ANSI escape sequences to clear terminal (Closes #545) - fold: wrap lines at specified width with -w/-s options (Closes #546) - expand/unexpand: convert between tabs and spaces (Closes #548) - envsubst: substitute environment variables in text (Closes #551) Each builtin includes comprehensive unit tests.
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Summary
clear: Output ANSI escape sequences to clear terminal screenfold: Wrap lines at specified width (-w,-sfor word boundary)expand/unexpand: Convert between tabs and spaces (-t Nfor custom tab stops)envsubst: Substitute$VAR/${VAR}references from environment variables (-vto list vars, SHELL-FORMAT to restrict)Test plan
cargo clippy --all-targets --all-features -- -D warningspassesCloses #545, Closes #546, Closes #548, Closes #551