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    diff

    diff command for MoonX.

    command-line
    moonx
    wasm
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    Version
    0.2.1
    License
    Apache-2.0
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    Last updated
    3 hours ago
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    56

    #diff

    Version 0.2.1 behavior is documented here. The support record separates local verification from published MoonX behavior; moonx examples use registry releases.

    Compare two files or directories, using - for stdin. Normal output identifies inserted, deleted and changed lines; -u/-U selects unified output and -c/-C selects context output, with three context lines by default.

    moonx cli/diff old.txt new.txt
moonx cli/diff -u --label old --label new old.txt new.txt

    -q/--brief reports differences without a patch. -s/--report-identical-files reports equal files. -a/--text treats NUL-containing inputs as text, preserving NUL and malformed UTF-8 bytes. Repeated --label options set the displayed left and right names, including brief, identical and binary reports.

    -i/--ignore-case compares ASCII letters without case. -w/--ignore-all-space ignores C whitespace within each line; -b/--ignore-space-change collapses whitespace runs and ignores trailing whitespace. -Z/--ignore-trailing-space ignores trailing whitespace only. Those whitespace modes also ignore the missing final line-feed distinction. -B/--ignore-blank-lines suppresses a change group only when every changed line is blank under the selected comparison rules; it does not remove blank lines before comparison. Unified/context hunks containing another substantive change retain the blank changes.

    --strip-trailing-cr removes one CR immediately before each LF, including displayed lines; a CR in an unterminated final line remains. Other comparison transformations preserve the original displayed bytes. Input records are byte views into the two buffered files. Comparison classes reuse those views when possible; only transformed keys allocate additional bytes. Rendering converts displayed records to text without converting either complete input file.

    Directory entries are processed in C byte order. Without -r/--recursive, common subdirectories are reported without descent. -N/--new-file compares missing sides as empty; --unidirectional-new-file does so only for a missing left side. A file paired with a directory selects the corresponding basename in that directory. Recursive traversal uses public path resolution to detect ancestor loops. Directory/file type differences and directory FIFO/socket pairs are reported like the fixed GNU profile. Top-level readable special files are compared as input streams. Directory character/block device pairs require device-number metadata; the same resolved path is equal, while other pairs remain an explicit device-number capability boundary. Symlinks follow their public filesystem targets; comparing link-target text itself remains outside this profile. Path messages use C-locale shell escaping, while automatic unified/context header names use C quoting. Explicit --label text remains unchanged.

    Exit status is 0 for identical files, 1 for a difference, and 2 for an input or option error. Directory errors retain earlier output and do not hide errors behind later successful entries. Non-C locale collation is outside this release. Timestamp headers honor TZ, TZDIR, 64-bit TZif transitions and explicit POSIX DST rules, including dates after 2038. With no TZ, the host's /etc/localtime is used. Missing timezone data is an error. Unified output uses ISO timestamps and context output uses the traditional weekday/month/day format. Use --label for stdin or hosts without a timezone database. --help and --version are available. Both files, record indexes, distinct comparison keys and patch output remain buffered. Unchanged keys share input bytes. Edit reconstruction uses bidirectional Myers frontiers and an explicit partition stack with O(N+M) auxiliary space, excluding input/key bytes and the produced edit/output records. Records without a possible counterpart bypass the edit search. Equivalent-line change alignment joins neighboring changes and exercises the registered GNU repeated-line cases. This is neither constant-memory diff nor a linear-time guarantee for high edit density.

    #Standalone metadata

    Standalone --version prints exactly diff 0.2.1 followed by one newline. Standalone --help starts with Usage: diff, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

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