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Date:      Thu, 21 Jul 2011 05:07:51 -0700
From:      perryh@pluto.rain.com
To:        kline@thought.org
Cc:        freebsd-questions@freebsd.org
Subject:   Re: scrpt help neded...
Message-ID:  <4e281697.2F3Hm7eEgDK4U/K6%perryh@pluto.rain.com>
In-Reply-To: <20110721004208.GA32046@thought.org>
References:  <20110721004208.GA32046@thought.org>

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Gary Kline <kline@thought.org> wrote:

> I'm looking for a script that takes on arg and lets   me vi/vim
> into the r esults.  Let's say that I'm looking for the string
> 201107 in a slew of files.  the script find it with grep---not
> grep -w, just grep.  collect es the filenames and lines (grep -n)
> and saves  then temporarily, then points vim or vi at each
> file+linenumbr and execs it for me.   the fewer keystrokes, the
> better.

To edit each file that contains 201107:

  $ vi ` grep -l 201107 {files to be searched} `

That won't pre-position within the files, but since it's a single
invocation of vi, with each subsequent file being loaded by :n, a
search pattern will persist (unless/until you replace it by entering
a different search pattern).  At the top of the first file, you enter

  /201107

to find the first instance, "n" to find the second, etc.  After :n
-- at the top of the second file -- "n" alone will find the first
instance.

OTOH if you want to bring up an xterm containing _the results of
the grep_ you can pipe it into the attached script.  There is no
manpage, but the comments and the (straightforward) parameter
decoding should provide a start.  (There are a few "magic numbers",
which ideally should be tweaked for your X11 installation's font
dimensions, but nothing horrible will happen if they are slightly
off.)

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#!/usr/local/bin/bash

# The maxl and maxw calculations involve "magic numbers," which ideally
# ought to be extracted from xterm and window-manager settings rather
# than being hard-coded.  Good luck figuring out a way to do that.
#
#   The xterm font is 6w x 13h
#
#   visible title bar height incl top frame = 29 pixels
#   + xterm margin inside frame = 1 pixel
#   + bottom frame & margin = 8 pixels (same as frame widths below)
#   + window-manager shadow = 1 pixel
#   => height available for text = screen height - 39 pixels
#
maxl=`(xwininfo -root | sed -n -e 's/  Height: //p' ; echo 39 - 13 / p) | dc`
#
#   visible frame width = 7 pixels
#   + xterm margin inside frame = 1 pixel
#   * 2 sides => total width of side frames = 16 pixels
#   + window-manager shadow = 1 pixel
#   => width available for text = screen width - 17 pixels
#
maxw=`(xwininfo -root | sed -n -e 's/  Width: //p' ; echo 17 - 6 / p) | dc`

# maxw "should" be used in conjunction with the max line length found in the
# file to automatically set the width (as is already being done for the length).

# Set defaults
w=80
l=0
n=stdin
flags=""
n_is_default=1
w_is_default=1

# Handle flag params
while [[ "$1" == -?* ]] ; do
   case "$1" in
      -w  )
	shift
	w="$1"
	w_is_default=0
	;;
      -w* )
	w="${1#-w}"
	w_is_default=0
	;;
      -l  )
	shift
	l="$1"
	;;
      -l* )
	l="${1#-l}"
	;;
      -n  )
	shift
	n="$1"
	n_is_default=0
	;;
      -n* )
	n="${1#-n}"
	n_is_default=0
	;;
      *   )
	flags="$flags $1"
   esac
   shift
done

# Check for no params => stdin, or 1st param of "-" (explicit stdin), and
# if so copy stdin to a file since there seems no way to get it passed to
# the "less" which will be running in the xterm.  Note that "-" will not
# work as any but the first non-flag parameter.
if [ "x$1" == "x" -o "$1" == "-" ] ; then
   cat > /tmp/xless$$
   shift
   if [ "$l" == "0" ] ; then
      l="`(head -$maxl /tmp/xless$$ | fold -w$w | wc -l ; echo \"1 + d [$maxl p q] sa $maxl <a p q\") | dc`"
   fi
   xterm -geometry "${w}x$l" +sb -sl 0 -title "$n - `pwd`" -n "$n" $flags -e sh -c "less /tmp/xless$$ $* ; rm /tmp/xless$$" &
else
   [ "$n_is_default" == "1" ] && n="`basename $1`"
   if [[ "$w_is_default" == "1" && "$1" == *.w=* ]] ; then
      w="`echo "$1" | sed -e 's/^.*\.w=//'`"
      [ "$n_is_default" == "1" ] && n="`echo "$n" | sed -e 's/\.w=.*$//'`"
   fi
   if [ "$l" == "0" ] ; then
      l="`(head -$maxl $1 | fold -w$w | wc -l ; echo \"1 + d [$maxl p q] sa $maxl <a p q\") | dc`"
   fi
   xterm -geometry "${w}x$l" +sb -sl 0 -title "$1 - `pwd`" -n "$n" $flags -e less $* &
fi

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