tests/pdiff
author Simon Sapin <simon.sapin@octobus.net>
Fri, 30 Apr 2021 19:57:46 +0200
changeset 47124 cd8ca38fccff
parent 33611 a2b55ee62803
permissions -rwxr-xr-x
rust: Use `&HgPath` instead of `&HgPathBuf` in may APIs Getting the former (through `Deref`) is almost the only useful thing one can do with the latter anyway. With this changes, API become more flexible for the "provider" of these paths which may store something else that Deref’s to HgPath, such as `std::borrow::Cow<HgPath>`. Using `Cow` can help reduce memory alloactions and copying. Differential Revision: https://phab.mercurial-scm.org/D10558
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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