[ITP] chere

[Dave <d_inabox at yahoo dot com>]

Recent traffic in the main mailing list indicated a package to manage Cygwin
Prompt Here functionality would be appreciated.

I propose contributing (and maintaining) a shell script to do this. See the
attached script for my initial version. It works as advertised on my W2K box,
installing and uninstalling a Bash/Rxvt context menu.

It needs some work, and input from term/shell maintainers on appropriate startup
incantations. I'd welcome any comments and feedback.

Is this going in the right direction? Has someone got a more appropriate
solution in the wings (I'm aware of Gerrits and a few other implementations)? Am
I wasting my time?


Dave.

Hints:
./chere -h
to get some help.

./chere -p -t rxvt -s bash
to print the commands to install Bash/Rxvt on stdout

./chere -t rxvt -s bash
to install Bash/Rxvt context menu

./chere -u -t rxvt
to uninstall Bash/Rxvt context menu



		
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#!/bin/bash
#
# This shell script (un)installs Cygwin Prompt Here functionality.
# Requires: regtool
#
# TODO
# ----
# 1. Transform to ash syntax, so bash isn't required
#       Problem with ash builtin getopts? I have an old ash...
# 2. Fix quoting
# 3. Can we pick the shell from /etc/passwd at runtime?
#
# Dave Kilroy
# Oct 2004
#
VERSION=0.1
#	Initial implementation.
#	Bash required.
#	Possible quoting problems.
#	Windows uninstall only posible if script present
#	Xterm command not known
#	Only Bash startup command verified

# Need to use eval to force correct quote evaluation
REGTOOL="eval regtool"
REGTOOL_=regtool

KNOWN_TERMS="cmd rxvt xterm"
KNOWN_SHELLS="ash bash cmd pdksh tcsh zsh"

ACTION=i
DO_WIN_UINST=t
FORCE=f

####################### Parse command line #######################
while getopts aciunmpfht:s: ARG ; do
  case $ARG in
    ( a ) USERS=a;;
    ( c ) USERS=c;;
    ( i ) ACTION=i;;
    ( u ) ACTION=u;;
    ( n ) DO_WIN_UINST=t;;
    ( m ) DO_WIN_UINST=f;;
    ( p ) REGTOOL="echo regtool";;
    ( t ) this_term=$OPTARG;;
    ( s ) this_shell=$OPTARG;;
    ( f ) FORCE=t;;
    ( h ) cat <<-EOF
	$0 version $VERSION

	Usage:
	$0 [-aciunmfph] -t <term> -s <shell>

	Adds the stated terminal/shell combination to the folder context menu.
	This allows you to right click a folder in Windows Explorer and open a
	Cygwin shell in that folder.

	You will require appropriate access rights for this to work. i.e. you
	probably need to have Administrator rights.

	Options:
	  a - All Users (Default)
	  c - Current User [Not Implemented. Is it possible?]
	  i - Install (Default)
	  u - Uninstall
	  n - Be Nice and provide Control Panel uninstall option (Default)
	  m - Minimal, no Control Panel uninstall
	  f - Force write
	  p - Print regtool commands to stdout rather than running them
	  h - Help

	Supported terminals:
	$KNOWN_TERMS

	Supported shells:
	$KNOWN_SHELLS

	Example:
	  $0 -t rxvt -s tcsh
	EOF
	exit;;
  esac
done

# Check windows version and cygwin install directory
VER=`uname -s`
CYG_DIR=`cygpath -m /`

#################### Define terminals ########################
# For each terminal, indicate how to start it in TERM_CMD,
# with the last option set for the following text to be the initial
# command to start the shell.
if [ $ACTION = i ]; then
 case $this_term in
  ( cmd )
	if [ VER = "CYGWIN_NT*" ]; then
	 TERM_CMD="cmd /k";
	else
	 TERM_CMD="command /k";
	fi;;
  ( rxvt )
	TERM_CMD="$CYG_DIR/bin/rxvt.exe -e";;
  ( xterm )
	TERM_CMD="$CYG_DIR/bin/xterm.exe";;
  ( * )
	echo $0 Error: Unknown terminal $this_term
	echo Supported terminals:
	echo $KNOWN_TERMS
	exit;;
 esac
fi

#################### Define shells #############################
# For each shell, indicate the command that should be used to 
# start it in the directory %1, and keep it open.
#
case $this_shell in
  ( bash )
	SHELL_CMD="$CYG_DIR/bin/bash --login -c \\\"cd '%1'; exec bash\\\""
	ACCEL="&Bash Here"
	CPH_DESC="Cygwin Bash Prompt Here";;
  ( ash )
	SHELL_CMD="$CYG_DIR/bin/sh -c \\\"cd '%1'; exec sh\\\"";
	ACCEL="&Ash Here"
	CPH_DESC="Cygwin Ash Prompt Here";;
  ( pdksh )
	SHELL_CMD="$CYG_DIR/bin/pdksh -c \\\"cd '%1'; exec pdksh\\\""
	ACCEL="&Pdksh Here"
	CPH_DESC="Cygwin Pdksh Prompt Here";;
  ( tcsh )
	SHELL_CMD="$CYG_DIR/bin/tcsh -c \\\"cd '%1'; exec tcsh\\\""
	ACCEL="&Tcsh Here"
	CPH_DESC="Cygwin Tcsh Prompt Here";;
  ( zsh )
	SHELL_CMD="$CYG_DIR/bin/zsh -c \\\"cd '%1'; exec zsh\\\""
	ACCEL="&Zsh Here"
	CPH_DESC="Cygwin Zsh Prompt Here";;
  ( cmd )
	# Note this doesn't work well if the folder is not on C:
	# You also need to switch directories
	SHELL_CMD="cd '%1'"
	ACCEL="&Command Prompt Here"
	CPH_DESC="Command Prompt Here (cygwin)";;
  ( * )
	echo $0 Error: Unknown shell $this_shell
	echo Supported shells:
	echo $KNOWN_SHELLS
	exit;;
esac

# Identify the registry keys for each OS
# Same for all?
DIR_KEY=/HKCR/Directory/Shell
DRIVE_KEY=/HKCR/Drive/Shell
UINST_KEY=/HKLM/Software/Microsoft/Windows/CurrentVersion/Uninstall

if [ $ACTION = i ]; then
####### Install ###########
 if [ $FORCE = t ] || ! $REGTOOL_ check $DRIVE_KEY/cygwin_$this_term 2> /dev/null ; then
  # Add Registry Key for Drives
  $REGTOOL add $DRIVE_KEY/cygwin_$this_term
  $REGTOOL -s set $DRIVE_KEY/cygwin_$this_term/ \"$ACCEL\"
  $REGTOOL add $DRIVE_KEY/cygwin_$this_term/command
  $REGTOOL -s set $DRIVE_KEY/cygwin_$this_term/command/ \"$TERM_CMD $SHELL_CMD\"
 fi

 if [ $FORCE = t ] || ! $REGTOOL_ check $DIR_KEY/cygwin_$this_term 2> /dev/null; then
  # Add Registry Key for Directories/Folders
  $REGTOOL add $DIR_KEY/cygwin_$this_term
  $REGTOOL -s set $DIR_KEY/cygwin_$this_term/ \"$ACCEL\"
  $REGTOOL add $DIR_KEY/cygwin_$this_term/command
  $REGTOOL -s set $DIR_KEY/cygwin_$this_term/command/ \"$TERM_CMD $SHELL_CMD\"
 fi

 if [ $DO_WIN_UINST = t ]; then
  # Add uninstall registry entry
  if [ $FORCE = t ] || ! $REGTOOL_ check $UINST_KEY/cygwin_$this_term 2> /dev/null ; then
   # Actually, should create an .inf so windows can get rid of the menu entries
   # even after the cygwin directory is wiped :(
   $REGTOOL add $UINST_KEY/cygwin_$this_term
   $REGTOOL -s set $UINST_KEY/cygwin_$this_term/DisplayName \"$CPH_DESC\"
   $REGTOOL -s set $UINST_KEY/cygwin_$this_term/UnInstallString \"$CYG_DIR/bin/bash -c \\\"$CYG_DIR/bin/chere -u -s $this_shell\\\"\"
  fi
 fi

elif [ $ACTION = u ]; then
###### UnInstall ##########
 # Assumed that regtool will remove subkeys recursively
 $REGTOOL remove $DRIVE_KEY/cygwin_$this_term/command
 $REGTOOL remove $DRIVE_KEY/cygwin_$this_term
 $REGTOOL remove $DIR_KEY/cygwin_$this_term/command
 $REGTOOL remove $DIR_KEY/cygwin_$this_term
 $REGTOOL remove $UINST_KEY/cygwin_$this_term
fi