[ILUG] patchfs (was Opposite of Cat)

[Padraig Brady]

Stephen_Reilly at dell.com wrote:
> Come to think of it...
> sed /begin/,/end/d filename will do just that...
> 
> steve

This reminds me that I used this when I was messing
with patchfs for midnight commander. For those who
don't know it's REALLY easy to create virtual filesystems
for midnight commander. Ones that exist already are
ftp/tar/rpm/deb/.. and I created this one for browsing
into patch files (in unified format):

####### snip ########
#! /bin/sh

export LC_ALL=C

patchfs_list ()
{
     date=`date +"%b %d %H:%M"`
     perm="-r--r--r--"
     uid=00000000
     gid=00000000
     size=00000000
     nlink="  1"

     echo "$perm $nlink $uid $gid $size $date SUMMARY"
     $cat $1 |
     sed -n "s/^+++ \([^ 	]*\).*/$perm $nlink $uid $gid $size $date \1/gp"
}

patchfs_copyout ()
{
     if [ "$2" = SUMMARY ]; then  # list of all affected files
	if diffstat -V >/dev/null 2>&1; then
             $cat $1 | diffstat 2>/dev/null > $3
         else
             sed -n "s/^+++ \([^ 	]*\).*/\1/gp" > $3
         fi
	exit 0
     fi

     fn=`echo $2 | sed 's|/|\\\/|g'`   # escape '/' in filename
     $cat $1 |
     sed -e '/^diff /d' |
     sed -ne "/^+++ .*$fn/,/^--- /{
                   /^--- /d
                   p
               }" > $3
}

type=`file $2`
case $type in
     *bzip*) cat="bzip2 -dc" ;;
     *gzip*) cat="gzip -dc" ;;
     *text*) cat="cat" ;;
     *) exit 1
esac

umask 077
case "$1" in
     list) patchfs_list $2; exit 0;;
     copyout) patchfs_copyout $2 $3 $4; exit 0;;
     run) exit 0;;
esac

exit 1
####### snip ########

You need to copy this to or overwrite /usr/lib/mc/extfs/patchfs,
and for all users to be able to use this automatically you
will need to edit /usr/lib/mc/mc.ext and before ### Archives ### add:

# Patches
regex/\.(patch|diff)\.*(gz|bz2)*$
        Open=%cd %p#patchfs

you will also need to do the same in your ~/.mc/ini file if it exits.

In summary all you need to do when this is set up is to browse to
a directory containing (compressed) patch files (*.diff or *.patch),
and hit return on the file, and you can view bits/stats of the patch
with F3.

It really is worth investing the 15 minutes required to learn mc.
It is so powerful, and nicely integrates with the unix environment
as illustrated above.

Padraig.