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#! /bin/sh
# Copyright (C) 2004-2014 Free Software Foundation, Inc.
# Written by Mike Bianchi <MBianchi@Foveal.com <mailto:MBianchi@Foveal.com>>
# This file is part of the gdiffmk utility, which is part of groff.
# groff is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# groff is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
# License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This file is part of GNU gdiffmk.
cmd=$( basename $0 )
Usage () {
if test "$#" -gt 0
then
echo >&2 "${cmd}: $@"
fi
echo >&2 "\
Usage: ${cmd} [ OPTIONS ] FILE1 FILE2 [ OUTPUT ]
Place difference marks into the new version of a groff/nroff/troff document.
FILE1 and FILE2 are compared, using \`diff', and FILE2 is output with
groff \`.mc' requests added to indicate how it is different from FILE1.
FILE1 Previous version of the groff file. \`-' means standard input.
FILE2 Current version of the groff file. \`-' means standard input.
Either FILE1 or FILE2 can be standard input, but not both.
OUTPUT Copy of FILE2 with \`.mc' commands added.
\`-' means standard output (the default).
OPTIONS:
-a ADDMARK Mark for added groff source lines. Default: \`+'.
-c CHANGEMARK Mark for changed groff source lines. Default: \`|'.
-d DELETEMARK Mark for deleted groff source lines. Default: \`*'.
-D Show the deleted portions from changed and deleted text.
Default delimiting marks: \`[[' .... \`]]'.
-B By default, the deleted texts marked by the \`-D' option end
with an added troff \`.br' command. This option prevents
the added \`.br'.
-M MARK1 MARK2 Change the delimiting marks for the \`-D' option.
-x DIFFCMD Use a different diff(1) command;
one that accepts the \`-Dname' option, such as GNU diff.
--version Print version information on the standard output and exit.
--help Print this message on the standard error.
"
exit 255
}
Exit () {
exitcode=$1
shift
for arg
do
echo >&2 "${cmd}: $1"
shift
done
exit ${exitcode}
}
# Usage: FileRead exit_code filename
#
# Check for existence and readability of given file name.
# If not found or not readable, print message and exit with EXIT_CODE.
FileRead () {
case "$2" in
-)
return
;;
esac
if test ! -e "$2"
then
Exit $1 "File \`$2' not found."
fi
if test ! -r "$2"
then
Exit $1 "File \`$2' not readable."
fi
}
# Usage: FileCreate exit_code filename
#
# Create the given filename if it doesn't exist.
# If unable to create or write, print message and exit with EXIT_CODE.
FileCreate () {
case "$2" in
-)
return
;;
esac
if ! touch "$2" 2>/dev/null
then
if test ! -e "$2"
then
Exit $1 "File \`$2' not created; " \
"Cannot write directory \`$( dirname "$2" )'."
fi
Exit $1 "File \`$2' not writeable."
fi
}
WouldClobber () {
case "$2" in
-)
return
;;
esac
if test "$1" -ef "$3"
then
Exit 3 \
"The $2 and OUTPUT arguments both point to the same file," \
"\`$1', and it would be overwritten."
fi
}
ADDMARK='+'
CHANGEMARK='|'
DELETEMARK='*'
MARK1='[['
MARK2=']]'
RequiresArgument () {
# Process flags that take either concatenated or
# separated values.
case "$1" in
-??*)
expr "$1" : '-.\(.*\)'
return 1
;;
esac
if test "$#" -lt 2
then
Exit 255 "Option \`$1' requires a value."
fi
echo "$2"
return 0
}
badoption=
DIFFCMD=diff
D_option=
br=.br
for OPTION
do
case "${OPTION}" in
-a*)
ADDMARK=$( RequiresArgument "${OPTION}" $2 ) &&
shift
;;
-c*)
CHANGEMARK=$( RequiresArgument "${OPTION}" $2 ) &&
shift
;;
-d*)
DELETEMARK=$( RequiresArgument "${OPTION}" $2 ) &&
shift
;;
-D )
D_option=D_option
;;
-M* )
MARK1=$( RequiresArgument "${OPTION}" $2 ) &&
shift
if [ $# -lt 2 ]
then
Usage "Option \`-M' is missing the MARK2 value."
fi
MARK2=$2
shift
;;
-B )
br=.
;;
-x* )
DIFFCMD=$( RequiresArgument "${OPTION}" $2 ) &&
shift
;;
--version)
echo "GNU ${cmd} (groff) version 1.22.3"
exit 0
;;
--help)
Usage
;;
--)
# What follows -- are file arguments
shift
break
;;
-)
break
;;
-*)
badoption="${cmd}: invalid option \`$1'"
;;
*)
break
;;
esac
shift
done
${DIFFCMD} -Dx /dev/null /dev/null >/dev/null 2>&1 ||
Usage "The \`${DIFFCMD}' program does not accept" \
"the required \`-Dname' option.
Use GNU diff instead. See the \`-x DIFFCMD' option."
if test -n "${badoption}"
then
Usage "${badoption}"
fi
if test "$#" -lt 2 -o "$#" -gt 3
then
Usage "Incorrect number of arguments."
fi
if test "1$1" = 1- -a "2$2" = 2-
then
Usage "Both FILE1 and FILE2 are \`-'."
fi
FILE1=$1
FILE2=$2
FileRead 1 "${FILE1}"
FileRead 2 "${FILE2}"
if test "$#" = 3
then
case "$3" in
-)
# output goes to standard output
;;
*)
# output goes to a file
WouldClobber "${FILE1}" FILE1 "$3"
WouldClobber "${FILE2}" FILE2 "$3"
FileCreate 3 "$3"
exec >$3
;;
esac
fi
# To make a very unlikely label even more unlikely ...
label=__diffmk_$$__
sed_script='
/^#ifdef '"${label}"'/,/^#endif \/\* '"${label}"'/ {
/^#ifdef '"${label}"'/ s/.*/.mc '"${ADDMARK}"'/
/^#endif \/\* '"${label}"'/ s/.*/.mc/
p
d
}
/^#ifndef '"${label}"'/,/^#endif \/\* [!not ]*'"${label}"'/ {
/^#else \/\* '"${label}"'/,/^#endif \/\* '"${label}"'/ {
/^#else \/\* '"${label}"'/ s/.*/.mc '"${CHANGEMARK}"'/
/^#endif \/\* '"${label}"'/ s/.*/.mc/
p
d
}
/^#endif \/\* \(not\|!\) '"${label}"'/ {
s/.*/.mc '"${DELETEMARK}"'/p
a\
.mc
}
d
}
p
'
if [ ${D_option} ]
then
sed_script='
/^#ifdef '"${label}"'/,/^#endif \/\* '"${label}"'/ {
/^#ifdef '"${label}"'/ s/.*/.mc '"${ADDMARK}"'/
/^#endif \/\* '"${label}"'/ s/.*/.mc/
p
d
}
/^#ifndef '"${label}"'/,/^#endif \/\* [!not ]*'"${label}"'/ {
/^#ifndef '"${label}"'/ {
i\
'"${MARK1}"'
d
}
/^#else \/\* '"${label}"'/ ! {
/^#endif \/\* [!not ]*'"${label}"'/ ! {
p
d
}
}
/^#else \/\* '"${label}"'/,/^#endif \/\* '"${label}"'/ {
/^#else \/\* '"${label}"'/ {
i\
'"${MARK2}"'\
'"${br}"'
s/.*/.mc '"${CHANGEMARK}"'/
a\
.mc '"${CHANGEMARK}"'
d
}
/^#endif \/\* '"${label}"'/ s/.*/.mc/
p
d
}
/^#endif \/\* \(not\|!\) '"${label}"'/ {
i\
'"${MARK2}"'\
'"${br}"'
s/.*/.mc '"${DELETEMARK}"'/p
a\
.mc
}
d
}
p
'
fi
diff -D"${label}" -- ${FILE1} ${FILE2} |
sed -n "${sed_script}"
# EOF
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