1#! /bin/bash
2#
3# cshtobash - convert csh aliases, environment variables, and variables to
4#	      bash equivalents
5#
6# usage: cshtobash [filename]
7#
8# If filename is given, that file is sourced.  Note that csh always
9# sources .cshrc.  To recreate your csh login environment, run
10# `cshtobash ~/.login'.
11#
12# Inspired by (and some borrowed from) a similar program distributed with
13# zsh-3.0.
14#
15# Chet Ramey
16# chet@po.cwru.edu
17#
18trap 'rm -f /tmp/cb$$.? cshout cshin' 0 1 2 3 6 15
19
20T=$'\t'
21
22SOURCE="${1:+source $1}"
23
24cat << EOF >cshin
25$SOURCE
26alias >! /tmp/cb$$.a
27setenv >! /tmp/cb$$.e
28set >! /tmp/cb$$.v
29EOF
30
31# give csh a minimal environment, similar to what login would provide
32/usr/bin/env - USER=$USER HOME=$HOME PATH=/usr/bin:/bin:/usr/ucb:. TERM=$TERM SHELL=$SHELL /bin/csh -i < ./cshin > cshout 2>&1
33
34# First convert aliases
35
36cat << \EOF >/tmp/cb$$.1
37mkalias ()
38{
39	case $2 in
40	'')	echo alias ${1}="''" ;;
41	*[#\!]*)
42		comm=$(echo $2 | sed  's/\!\*/"$\@"/g
43				       s/\!:\([1-9]\)/"$\1"/g
44			               s/#/\#/g')
45		echo $1 \(\) "{" command "$comm"  "; }"
46		;;
47	*)	echo alias ${1}=\'$(echo "${2}" | sed "s:':'\\\\'':")\' ;;
48	esac
49}
50EOF
51
52sed "s/^\([a-zA-Z0-9_]*\)$T\(.*\)$/mkalias \1 '\2'/" < /tmp/cb$$.a >>/tmp/cb$$.1
53
54echo '# csh aliases'
55echo
56
57$BASH /tmp/cb$$.1 | sed -e 's/\$cwd/\$PWD/g' \
58		   -e 's/\$term/\$TERM/g' \
59		   -e 's/\$home/\$HOME/g' \
60		   -e 's/\$user/\$USER/g' \
61		   -e 's/\$prompt/\$PS1/g'
62
63# Next, convert environment variables
64echo
65echo '# csh environment variables'
66echo
67
68# Would be nice to deal with embedded newlines, e.g. in TERMCAP, but ...
69sed -e '/^SHLVL/d' \
70    -e '/^PWD/d' \
71    -e "s/'/'"\\\\"''"/g \
72    -e "s/^\([A-Za-z0-9_]*=\)/export \1'/" \
73    -e "s/$/'/" < /tmp/cb$$.e
74
75# Finally, convert local variables
76echo
77echo '# csh variables'
78echo
79
80sed -e 's/'"$T"'/=/' \
81    -e "s/'/'"\\\\"''"/g \
82    -e '/^[A-Za-z0-9_]*=[^(]/{
83	s/=/='"'/"'
84	s/$/'"'/"'
85	}' < /tmp/cb$$.v |
86sed -e '/^argv=/d' -e '/^cwd=/d' -e '/^filec=/d' -e '/^status=/d' \
87	 -e '/^verbose=/d' \
88	 -e '/^term=/d' \
89	 -e '/^home=/d' \
90	 -e '/^path=/d' \
91	 -e '/^user=/d' \
92	 -e '/^shell=/d' \
93	 -e '/^cdpath=/d' \
94	 -e '/^mail=/d' \
95	 -e '/^home=/s//HOME=/' \
96	 -e '/^prompt=/s//PS1=/' \
97	 -e '/^histfile=/s//HISTFILE=/' \
98	 -e '/^history=/s//HISTSIZE=/' \
99	 -e '/^savehist=$/s//HISTFILESIZE=${HISTSIZE-500}/' \
100	 -e '/^savehist=/s//HISTFILESIZE=/' \
101	 -e '/^ignoreeof=$/s/^.*$/set -o ignoreeof # ignoreeof/' \
102	 -e '/^ignoreeof=/s//IGNOREEOF=/' \
103	 -e '/^noclobber=/s/^.*$/set -C # noclobber/' \
104	 -e '/^notify=/s/^.*$/set -b # notify/' \
105	 -e '/^noglob=/s/^.*$/set -f # noglob/' \
106
107
108# now some special csh variables converted to bash equivalents
109echo
110echo '# special csh variables converted to bash equivalents'
111echo
112
113sed -e 's/'"$T"'/=/' < /tmp/cb$$.v |
114grep "^cdpath=" |
115sed 's/(//
116     s/ /:/g
117     s/)//
118     s/cdpath=/CDPATH=/'
119
120
121sed -e 's/'"$T"'/=/' < /tmp/cb$$.v |
122grep "^mail=" |
123sed 's/(//
124     s/ /:/g
125     s/)//
126     s/mail=/MAILPATH=/' |
127sed -e 's/MAILPATH=\([0-9][0-9][^:]*\)$/MAILCHECK=\1/' \
128    -e 's/MAILPATH=\([0-9][0-9][^:]*\):\(.*\)/MAILCHECK=\1 MAILPATH=\2/'
129
130exit 0
131