tests/pdiff
author Kyle Lippincott <spectral@google.com>
Mon, 08 Jul 2019 13:06:46 -0700
changeset 42572 cd4f1b7c3192
parent 33611 a2b55ee62803
permissions -rwxr-xr-x
crecord: make KEY_ENTER usable in tests (by not updating UI) Differential Revision: https://phab.mercurial-scm.org/D6620
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#!/bin/sh
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# Script to get stable diff output on any platform.
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#
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# Output of this script is almost equivalent to GNU diff with "-Nru".
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#
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# Use this script as "hg pdiff" via extdiff extension with preparation
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# below in test scripts:
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#
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#   $ cat >> $HGRCPATH <<EOF
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#   > [extdiff]
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#   > pdiff = sh "$RUNTESTDIR/pdiff"
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#   > EOF
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filediff(){
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    # USAGE: filediff file1 file2 [header]
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    # compare with /dev/null if file doesn't exist (as "-N" option)
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    file1="$1"
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    if test ! -f "$file1"; then
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        file1=/dev/null
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    fi
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    file2="$2"
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    if test ! -f "$file2"; then
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        file2=/dev/null
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    fi
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    if cmp -s "$file1" "$file2" 2> /dev/null; then
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        # Return immediately, because comparison isn't needed. This
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        # also avoids redundant message of diff like "No differences
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        # encountered" (on Solaris)
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        return
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    fi
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    if test -n "$3"; then
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        # show header only in recursive case
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        echo "$3"
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    fi
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    # replace "/dev/null" by corresponded filename (as "-N" option)
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    diff -u "$file1" "$file2" |
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    sed "s@^--- /dev/null\(.*\)\$@--- $1\1@" |
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    sed "s@^\+\+\+ /dev/null\(.*\)\$@+++ $2\1@"
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    # in this case, files differ from each other
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    return 1
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}
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if test -d "$1" -o -d "$2"; then
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    # ensure comparison in dictionary order
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    (
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    if test -d "$1"; then (cd "$1" && find . -type f); fi
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    if test -d "$2"; then (cd "$2" && find . -type f); fi
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    ) |
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    sed 's@^\./@@g' | sort | uniq |
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    while read file; do
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        filediff "$1/$file" "$2/$file" "diff -Nru $1/$file $2/$file"
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    done
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    # TODO: there is no portable way for current while-read based
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    # implementation to return 1 at detecting changes.
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    #
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    # On bash and dash, assignment to variable inside while-block
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    # doesn't affect outside, because inside while-block is executed
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    # in sub-shell. BTW, it affects outside while-block on ksh (as sh
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    # on Solaris).
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else
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    filediff "$1" "$2"
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fi