author | Kyle Lippincott <spectral@google.com> |
Mon, 08 Jul 2019 13:06:46 -0700 | |
changeset 42572 | cd4f1b7c3192 |
parent 33611 | a2b55ee62803 |
permissions | -rwxr-xr-x |
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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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|
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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 |