[profile] / dot / shell-rc

### -*-sh-*-
###
### Common per-shell configuration.

###--------------------------------------------------------------------------
### Utilities.

__mdw_programp () { type >/dev/null 2>&1 "$1"; }

__mdw_source_if_exists () {
  local i
  for i in "$@"; do
    if [ -r "$i" ]; then . "$i"; fi
  done
}

###--------------------------------------------------------------------------
### Hooks.

__mdw_addhook () {
  local hk=$1 fn=$2 t

  eval t=\${$hk+t}
  case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac

  eval t=\$$hk
  case " $t " in
    *" $fn "*) ;;
    *) eval "$hk=\${$hk:+\$$hk }\$fn" ;;
  esac
}

__mdw_delhook () {
  local hk=$1 fn=$2 t l r

  eval t=\${$hk+t}
  case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac

  eval t=\" \$$hk \"
  case $t in
    *" $fn "*)
      l=${t%% $fn*} r=${t##*$fn }
      l=${l# } r=${r% }
      eval "$hk=\$l\${l:+ }\$r"
      ;;
  esac
}

__mdw_setrc () { return $1; }

__mdw_runhook () {
  local hk=$1 saverc=$? t i; shift

  eval t=\${$hk+t}
  case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac

  eval t=\$$hk
  for i in $t; do __mdw_setrc $saverc; "$i" "$@"; done
}

###--------------------------------------------------------------------------
### Prompt machinery.

__mdw_host=$(hostname)
__mdw_hqual=
__mdw_hqual=$__mdw_hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}
__mdw_hqual=$__mdw_hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}
__mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }

: ${USER-${LOGNAME-$(id -un)}}
__mdw_user=$USER

__mdw_set_prompt_pieces () {

  ## Fancy highlighting in some terminals.
  local bold unbold nl gitcolour rccolour uncolour
  local host dir more
  bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
  __mdw_set_prompt_hacks

  ## Choose the right delimiters.  Highlight root prompts specially;
  ## highlight when I'm running as some other user.  Highlight when this
  ## isn't the outermost shell on the terminal.
  local left right u tty
  case $(id -u) in
    0)
      left=$(echo « | iconv -f UTF-8 -t //translit)
      right=$(echo » | iconv -f UTF-8 -t //translit)
      ;;
    *)
      case $USER in
	mdw | mwooding | nemo) u="" left="[" right="]" ;;
	*) u="$__mdw_user@" left="{" right="}" ;;
      esac
      tty=$(tty)
      case "$__mdw_tty" in
	"$tty") left="<" right=">" ;;
	*) __mdw_tty=$tty; export __mdw_tty ;;
      esac
      ;;
  esac

  ## If this session is insecure then highlight that.
  local sec_l sec_r h
  h=$(hostname)
  case ${SSH_CLIENT-nil},${SCHROOT_CHROOT_NAME-nil},$__mdw_sechost in
    nil,nil,"$h") sec_l="" sec_r="" ;;
    nil,nil,*) sec_l="(" sec_r=")" ;;
    *) sec_l="" sec_r=""
  esac

  ## If this is an schroot environment or some other interesting augmented
  ## environment then point this out.

  ## Put together the main pieces.
  __mdw_prompt_left="$nl$bold$left$sec_l$u$host$__mdw_hqual$sec_r$dir"
  __mdw_prompt_git_left="$unbold$gitcolour"
  __mdw_prompt_git_right="$uncolour$bold"
  __mdw_prompt_rc_left="$unbold$rccolour"
  __mdw_prompt_rc_right="$uncolour$bold"
  __mdw_prompt_right="$right$unbold"
  __mdw_prompt_more=" $more$bold>$unbold "
}

__mdw_set_prompt () {
  case "${TERM-dumb}:${INSIDE_EMACS+$INSIDE_EMACS}" in
    dumb:)
      case $(id -u) in 0) PS1='# ' ;; *) PS1='$ ' ;; esac
      PS2='> '
      ;;
    *)
      __mdw_last_rc=$?
      local git rc
      if type __git_ps1 >/dev/null 2>&1; then
	git="$__mdw_prompt_git_left$(__git_ps1)$__mdw_prompt_git_right"
      else
	git=""
      fi
      case $__mdw_last_rc in
	0) rc="" ;;
	*) rc="$__mdw_prompt_rc_left rc=$__mdw_last_rc$__mdw_prompt_rc_right" ;;
      esac
      PS1="$__mdw_prompt_left$git$rc$__mdw_prompt_right"
      PS2="$PS1$__mdw_prompt_more"
      unset __mdw_last_rc
      ;;
  esac
}

__mdw_xterm_settitle () {
  printf >/dev/tty \
    "\e]2;%s@%s:%s – %s\e\\" \
    "$__mdw_user" "$__mdw_host$__mdw_hqual" "$PWD" \
    "$1"
}
__mdw_xterm_precmd () { __mdw_xterm_settitle "$__mdw_shell"; }
__mdw_xterm_preexec () { __mdw_xterm_settitle "$1"; }

__mdw_screen_settitle () {
  printf >/dev/tty \
    "\ek%s\e\\" \
    "$1"
}
__mdw_screen_precmd () { __mdw_screen_settitle "$__mdw_shell"; }
__mdw_screen_preexec () { __mdw_screen_settitle "$1"; }

if [ -t 0 ]; then
  case ${STY+t},${__mdw_precmd_hook+t},${__mdw_preexec_hook+t},${TERM} in
    ,t,t,xterm*)
      __mdw_addhook __mdw_precmd_hook __mdw_xterm_precmd
      __mdw_addhook __mdw_preexec_hook __mdw_xterm_preexec
      ;;
    t,t,t,*)
      __mdw_addhook __mdw_precmd_hook __mdw_screen_precmd
      __mdw_addhook __mdw_preexec_hook __mdw_screen_preexec
      ;;
  esac
  case ${__mdw_precmd_hook+t} in
    t) __mdw_addhook __mdw_precmd_hook __mdw_set_prompt ;;
  esac
fi

###--------------------------------------------------------------------------
### Some handy aliases.

alias cx='chmod +x'
alias which="command -v"
alias rc="rc -l"
rootly () {
  case $# in 0) set -- "${SHELL-/bin/sh}" ;; esac
  $__MDW_ROOTLY "$@"
}
alias r=rootly
alias re="rootly $EDITOR"
alias pstree="pstree -hl"
alias cdtmp='cd ${TMPDIR-/tmp}'
alias pushtmp='pushd ${TMPDIR-/tmp}'
alias e="$EDITOR"
alias svn="svnwrap svn"
alias @="ssh"
alias make="nice make"
alias cross-run="nice cross-run"
alias gdb="gdb -q"

###--------------------------------------------------------------------------
### Colour output.

## Arrange for `ls' output to be in colour.
if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
else unset LS_COLORS; fi

unalias ls 2>/dev/null || :
ls () {
  if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
  else command ls "$@"; fi
}

## Arrange for `grep' output to be in colour.
export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"

greplike () {
  local grep=$1; shift
  if [ -t 1 ]; then
    command $grep ${GREP_COLORS+--color=always} "$@" | mdw-pager
  else
    command $grep "$@"
  fi
}
alias grep="greplike grep"
alias egrep="greplike egrep"
alias fgrep="greplike fgrep"
alias zgrep="greplike zgrep"

## Arrange for `diff' output to be in colour.
export DIFF_COLORS="hd=1:ln=36:ad=32:de=31"
difflike () {
  local diff=$1; shift
  if [ -t 1 ]; then
    command $diff \
	    ${DIFF_COLORS+--color=always} \
	    ${DIFF_COLORS+--palette="$DIFF_COLORS"} \
	    "$@" | mdw-pager
  else
    command $diff "$@" | cat
  fi
}
alias diff="difflike diff"

###--------------------------------------------------------------------------
### Other hacks.

## Turn off pagers inside Emacs shell buffers.
case "$INSIDE_EMACS" in
  2[2-9].*,comint | [3-9][0-9].*,comint) export PAGER=cat ;;
esac

###--------------------------------------------------------------------------
### More complicated shell functions.

## xt [@HOST] XTERM-ARGS
##
## Open a terminal, maybe on a remote host.
xt () {
  case "$1" in
    @*)
      local remote=${1#@} title
      shift
      if [ $# -gt 0 ]; then
	title="xterm [$remote] $1"
      else
	title="xterm [$remote]"
      fi
      (xterm -title "$title" -e ssh $remote "$@" &)
      ;;
    *)
      (xterm "$@" &)
      ;;
  esac
}

## core [y|n]
##
## Tweak core dumps on and off, or show the current status.
core () {
  case "x$1" in
    xon|xy|xyes) ulimit -Sc $(ulimit -Hc) ;;
    xoff|xn|xno) ulimit -Sc 0 ;;
    x)
      local l=$(ulimit -Sc)
      case $l in
	0) echo "Core dumps disabled" ;;
	unlimited) echo "Core dumps enabled" ;;
	*) echo "Core dump limit is $l blocks" ;;
      esac
      ;;
    *)
      echo >&2 "usage: core [y|n]"
      return 1
      ;;
  esac
}

## world [NAME]
##
## Set current security world to NAME.  With no NAME, print the currently
## selected world.
world () {
  local nfast=${NFAST_HOME-/opt/nfast}
  local kmdata
  case "$#" in
    0)
      echo "${NFAST_KMDATA#$nfast/kmdata-}"
      ;;
    *)
      if [ -d "$1" ]; then
	kmdata=$1
      elif [ -d "$nfast/kmdata-$1" ]; then
	kmdata=$nfast/kmdata-$1
      else
	echo >&2 "world: can't find world $1"
	return 1
      fi
      shift
      case "$#" in
	0) export NFAST_KMDATA=$kmdata ;;
	*) "$@" ;;
      esac
      ;;
  esac
}

## path-add [VAR] DIR
##
## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
## it's not there already.
path_add () {
  local pathvar export dir val
  case $# in
    1) pathvar=PATH dir=$1 export="export PATH" ;;
    2) pathvar=$1 dir=$2 export=: ;;
    *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
  esac
  eval val=\$$pathvar
  case ":$val:" in
    *:"$dir":*) ;;
    *) val=$dir:$val ;;
  esac
  eval $pathvar=\$val
  eval $export
}

## path-remove [VAR] DIR
##
## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
## error if DIR isn't in VAR.
path_remove () {
  local pathvar export dir val
  case $# in
    1) pathvar=PATH dir=$1 export="export PATH" ;;
    2) pathvar=$1 dir=$2 export=: ;;
    *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
  esac
  eval val=\$$pathvar
  case ":$val:" in
    :"$dir":) val= ;;
    :"$dir":*) val=${val#$dir:} ;;
    *:"$dir":) val=${val%:$dir} ;;
    *:"$dir":*) val=${val%%:$dir:*}:${val#*:$dir:} ;;
  esac
  eval $pathvar=\$val
  eval $export
}

## pathhack [-f] +HACK|-HACK...
##
## Each HACK refers to a subdirectory of `~/bin/hacks'.  A hack name preceded
## by `+' adds the directory to the PATH; a `-' removes.  Adding a hack
## that's already on the PATH doesn't do anything unless `-f' is set, in
## which case it gets moved to the beginning.  With no arguments, print the
## currently installed hacks.
pathhack () {
  local p e force arg hack dir
  p=$PATH
  if [ $# -eq 0 ]; then
    while :; do
      e=${p%%:*}
      case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
      case "$p" in *:*) p=${p#*:} ;; *) break ;; esac
    done
    return
  fi
  force=nil
  while [ $# -gt 0 ]; do
    arg=$1
    case "$arg" in
      -f | --force) force=t; shift; continue ;;
      --) shift; break ;;
      [-+]*) ;;
      *) break; ;;
    esac
    hack=${arg#[+-]}
    dir=$HOME/bin/hacks/$hack
    if ! [ -d "$dir" ]; then
      echo "$0: path hack $hack not found"
      return 1
    fi
    case "$arg,$force,:$PATH:" in
      -*,*,*:"$dir":*) path_remove p "$dir" ;;
      +*,t,*:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
      +*,nil,*:"$dir":*) ;;
      +*,*) path_add p "$dir" ;;
    esac
    shift
  done
  if [ $# -eq 0 ]; then PATH=$p; export PATH
  else PATH=$p "$@"; fi
}

###--------------------------------------------------------------------------
### Finishing touches.

## Make sure `$HOME/bin' is on the path.
path_add "$HOME/bin"

## Set the temporary directory again.  (A setuid or setgid program may have
## unhelpfully forgotten this for us.)
case ${TMPDIR+t} in
  t) ;;
  *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
esac

## For `root' use -- some simple molly-guards.
case $(id -u) in
  0)
    alias rm="rm -i" cp="cp -i" mv="mv -i"
    set -o noclobber
    ;;
esac

## Run any local hooks.
__mdw_source_if_exists "$HOME/.shell-local"

###----- That's all, folks --------------------------------------------------
Commit	Line	Data
74a53e28 MW	1	### --sh--
	2	###
	3	### Common per-shell configuration.
	4
	5	###--------------------------------------------------------------------------
	6	### Utilities.
	7
	8	__mdw_programp () { type >/dev/null 2>&1 "$1"; }
	9
	10	__mdw_source_if_exists () {
	11	local i
	12	for i in "$@"; do
	13	if [ -r "$i" ]; then . "$i"; fi
	14	done
	15	}
	16
	17	###--------------------------------------------------------------------------
4877b8d8 MW	18	### Hooks.
	19
	20	__mdw_addhook () {
	21	local hk=$1 fn=$2 t
	22
	23	eval t=\${$hk+t}
	24	case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac
	25
	26	eval t=\$$hk
	27	case " $t " in
	28	" $fn ") ;;
	29	*) eval "$hk=\${$hk:+\$$hk }\$fn" ;;
	30	esac
	31	}
	32
	33	__mdw_delhook () {
	34	local hk=$1 fn=$2 t l r
	35
	36	eval t=\${$hk+t}
	37	case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac
	38
	39	eval t=\" \$$hk \"
	40	case $t in
	41	" $fn ")
	42	l=${t%% $fn} r=${t##$fn }
	43	l=${l# } r=${r% }
	44	eval "$hk=\$l\${l:+ }\$r"
	45	;;
	46	esac
	47	}
	48
	49	__mdw_setrc () { return $1; }
	50
	51	__mdw_runhook () {
	52	local hk=$1 saverc=$? t i; shift
	53
	54	eval t=\${$hk+t}
	55	case $t in t) ;; *) echo >&2 "unknown hook \`$hk'"; return 2; esac
	56
	57	eval t=\$$hk
	58	for i in $t; do __mdw_setrc $saverc; "$i" "$@"; done
	59	}
	60
	61	###--------------------------------------------------------------------------
74a53e28 MW	62	### Prompt machinery.
74a53e28 MW	63
2bbac58c	64	__mdw_host=$(hostname)
d4bbc0c0 MW	65	__mdw_hqual=
	66	__mdw_hqual=$__mdw_hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}
	67	__mdw_hqual=$__mdw_hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}
2bbac58c	68	__mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }
74a53e28	69
c35d2efc	70	: ${USER-${LOGNAME-$(id -un)}}
85e5c878	71	__mdw_user=$USER
c35d2efc	72
74a53e28	73	__mdw_set_prompt_pieces () {
74a53e28 MW	74
	75	## Fancy highlighting in some terminals.
	76	local bold unbold nl gitcolour rccolour uncolour
55360ba3 MW	77	local host dir more
55360ba3 MW	78	bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
74a53e28 MW	79	__mdw_set_prompt_hacks
	80
	81	## Choose the right delimiters. Highlight root prompts specially;
	82	## highlight when I'm running as some other user. Highlight when this
	83	## isn't the outermost shell on the terminal.
81ba988c	84	local left right u tty
74a53e28 MW	85	case $(id -u) in
	86	0)
	87	left=$(echo « \| iconv -f UTF-8 -t //translit)
	88	right=$(echo » \| iconv -f UTF-8 -t //translit)
	89	;;
	90	*)
81ba988c	91	case $USER in
74a53e28	92	mdw \| mwooding \| nemo) u="" left="[" right="]" ;;
85e5c878	93	*) u="$__mdw_user@" left="{" right="}" ;;
74a53e28 MW	94	esac
	95	tty=$(tty)
	96	case "$__mdw_tty" in
	97	"$tty") left="<" right=">" ;;
	98	*) __mdw_tty=$tty; export __mdw_tty ;;
	99	esac
	100	;;
	101	esac
	102
	103	## If this session is insecure then highlight that.
	104	local sec_l sec_r h
	105	h=$(hostname)
	106	case ${SSH_CLIENT-nil},${SCHROOT_CHROOT_NAME-nil},$__mdw_sechost in
	107	nil,nil,"$h") sec_l="" sec_r="" ;;
	108	nil,nil,*) sec_l="(" sec_r=")" ;;
	109	*) sec_l="" sec_r=""
	110	esac
	111
1a1af55e MW	112	## If this is an schroot environment or some other interesting augmented
1a1af55e MW	113	## environment then point this out.
74a53e28 MW	114
74a53e28 MW	115	## Put together the main pieces.
d4bbc0c0	116	__mdw_prompt_left="$nl$bold$left$sec_l$u$host$__mdw_hqual$sec_r$dir"
74a53e28 MW	117	__mdw_prompt_git_left="$unbold$gitcolour"
	118	__mdw_prompt_git_right="$uncolour$bold"
	119	__mdw_prompt_rc_left="$unbold$rccolour"
	120	__mdw_prompt_rc_right="$uncolour$bold"
	121	__mdw_prompt_right="$right$unbold"
55360ba3	122	__mdw_prompt_more=" $more$bold>$unbold "
74a53e28 MW	123	}
	124
	125	__mdw_set_prompt () {
062b450d	126	case "${TERM-dumb}:${INSIDE_EMACS+$INSIDE_EMACS}" in
d281a650	127	dumb:)
55bd0261 MW	128	case $(id -u) in 0) PS1='# ' ;; *) PS1='$ ' ;; esac
	129	PS2='> '
	130	;;
	131	*)
	132	__mdw_last_rc=$?
	133	local git rc
	134	if type __git_ps1 >/dev/null 2>&1; then
	135	git="$__mdw_prompt_git_left$(__git_ps1)$__mdw_prompt_git_right"
	136	else
	137	git=""
	138	fi
	139	case $__mdw_last_rc in
	140	0) rc="" ;;
	141	*) rc="$__mdw_prompt_rc_left rc=$__mdw_last_rc$__mdw_prompt_rc_right" ;;
	142	esac
	143	PS1="$__mdw_prompt_left$git$rc$__mdw_prompt_right"
55360ba3	144	PS2="$PS1$__mdw_prompt_more"
55bd0261 MW	145	unset __mdw_last_rc
55bd0261 MW	146	;;
74a53e28	147	esac
74a53e28 MW	148	}
74a53e28 MW	149
1e8b505f MW	150	__mdw_xterm_settitle () {
	151	printf >/dev/tty \
	152	"\e]2;%s@%s:%s – %s\e\\" \
85e5c878	153	"$__mdw_user" "$__mdw_host$__mdw_hqual" "$PWD" \
1e8b505f MW	154	"$1"
	155	}
	156	__mdw_xterm_precmd () { __mdw_xterm_settitle "$__mdw_shell"; }
	157	__mdw_xterm_preexec () { __mdw_xterm_settitle "$1"; }
05f8a57d	158
1e8b505f MW	159	__mdw_screen_settitle () {
	160	printf >/dev/tty \
	161	"\ek%s\e\\" \
	162	"$1"
	163	}
	164	__mdw_screen_precmd () { __mdw_screen_settitle "$__mdw_shell"; }
	165	__mdw_screen_preexec () { __mdw_screen_settitle "$1"; }
74a53e28	166
4877b8d8	167	if [ -t 0 ]; then
05f8a57d MW	168	case ${STY+t},${__mdw_precmd_hook+t},${__mdw_preexec_hook+t},${TERM} in
	169	,t,t,xterm*)
	170	__mdw_addhook __mdw_precmd_hook __mdw_xterm_precmd
	171	__mdw_addhook __mdw_preexec_hook __mdw_xterm_preexec
	172	;;
	173	t,t,t,*)
4877b8d8 MW	174	__mdw_addhook __mdw_precmd_hook __mdw_screen_precmd
	175	__mdw_addhook __mdw_preexec_hook __mdw_screen_preexec
	176	;;
74a53e28	177	esac
4877b8d8 MW	178	case ${__mdw_precmd_hook+t} in
	179	t) __mdw_addhook __mdw_precmd_hook __mdw_set_prompt ;;
	180	esac
	181	fi
74a53e28 MW	182
	183	###--------------------------------------------------------------------------
	184	### Some handy aliases.
	185
	186	alias cx='chmod +x'
	187	alias which="command -v"
	188	alias rc="rc -l"
	189	rootly () {
	190	case $# in 0) set -- "${SHELL-/bin/sh}" ;; esac
	191	$__MDW_ROOTLY "$@"
	192	}
	193	alias r=rootly
	194	alias re="rootly $EDITOR"
	195	alias pstree="pstree -hl"
	196	alias cdtmp='cd ${TMPDIR-/tmp}'
	197	alias pushtmp='pushd ${TMPDIR-/tmp}'
	198	alias e="$EDITOR"
	199	alias svn="svnwrap svn"
	200	alias @="ssh"
daeece4b	201	alias make="nice make"
ee747cc6	202	alias cross-run="nice cross-run"
8712436f	203	alias gdb="gdb -q"
74a53e28 MW	204
	205	###--------------------------------------------------------------------------
	206	### Colour output.
	207
	208	## Arrange for `ls' output to be in colour.
	209	if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
	210	else unset LS_COLORS; fi
	211
	212	unalias ls 2>/dev/null \|\| :
	213	ls () {
	214	if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
	215	else command ls "$@"; fi
	216	}
	217
	218	## Arrange for `grep' output to be in colour.
	219	export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"
	220
	221	greplike () {
	222	local grep=$1; shift
	223	if [ -t 1 ]; then
	224	command $grep ${GREP_COLORS+--color=always} "$@" \| mdw-pager
	225	else
	226	command $grep "$@"
	227	fi
	228	}
	229	alias grep="greplike grep"
	230	alias egrep="greplike egrep"
	231	alias fgrep="greplike fgrep"
	232	alias zgrep="greplike zgrep"
	233
049cd015 MW	234	## Arrange for `diff' output to be in colour.
	235	export DIFF_COLORS="hd=1:ln=36:ad=32:de=31"
	236	difflike () {
	237	local diff=$1; shift
	238	if [ -t 1 ]; then
	239	command $diff \
	240	${DIFF_COLORS+--color=always} \
	241	${DIFF_COLORS+--palette="$DIFF_COLORS"} \
	242	"$@" \| mdw-pager
	243	else
	244	command $diff "$@" \| cat
	245	fi
	246	}
	247	alias diff="difflike diff"
	248
74a53e28 MW	249	###--------------------------------------------------------------------------
	250	### Other hacks.
	251
	252	## Turn off pagers inside Emacs shell buffers.
	253	case "$INSIDE_EMACS" in
	254	2[2-9].,comint \| [3-9][0-9].,comint) export PAGER=cat ;;
	255	esac
	256
	257	###--------------------------------------------------------------------------
	258	### More complicated shell functions.
	259
	260	## xt [@HOST] XTERM-ARGS
	261	##
	262	## Open a terminal, maybe on a remote host.
	263	xt () {
	264	case "$1" in
	265	@*)
	266	local remote=${1#@} title
	267	shift
	268	if [ $# -gt 0 ]; then
	269	title="xterm [$remote] $1"
	270	else
	271	title="xterm [$remote]"
	272	fi
	273	(xterm -title "$title" -e ssh $remote "$@" &)
	274	;;
	275	*)
	276	(xterm "$@" &)
	277	;;
	278	esac
	279	}
	280
	281	## core [y\|n]
	282	##
	283	## Tweak core dumps on and off, or show the current status.
	284	core () {
	285	case "x$1" in
	286	xon\|xy\|xyes) ulimit -Sc $(ulimit -Hc) ;;
	287	xoff\|xn\|xno) ulimit -Sc 0 ;;
	288	x)
	289	local l=$(ulimit -Sc)
	290	case $l in
	291	0) echo "Core dumps disabled" ;;
	292	unlimited) echo "Core dumps enabled" ;;
	293	*) echo "Core dump limit is $l blocks" ;;
	294	esac
	295	;;
	296	*)
	297	echo >&2 "usage: core [y\|n]"
	298	return 1
	299	;;
	300	esac
	301	}
	302
	303	## world [NAME]
	304	##
	305	## Set current security world to NAME. With no NAME, print the currently
	306	## selected world.
	307	world () {
	308	local nfast=${NFAST_HOME-/opt/nfast}
	309	local kmdata
	310	case "$#" in
	311	0)
	312	echo "${NFAST_KMDATA#$nfast/kmdata-}"
313	;;
314	*)
315	if [ -d "$1" ]; then
316	kmdata=$1
317	elif [ -d "$nfast/kmdata-$1" ]; then
318	kmdata=$nfast/kmdata-$1
319	else
320	echo >&2 "world: can't find world $1"
321	return 1
322	fi
323	shift
324	case "$#" in
325	0) export NFAST_KMDATA=$kmdata ;;
326	*) "$@" ;;
327	esac
328	;;
329	esac
330	}
331
332	## path-add [VAR] DIR
333	##
334	## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
335	## it's not there already.
336	path_add () {
337	local pathvar export dir val
338	case $# in
339	1) pathvar=PATH dir=$1 export="export PATH" ;;
340	2) pathvar=$1 dir=$2 export=: ;;
341	*) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
342	esac
343	eval val=\$$pathvar
344	case ":$val:" in
345	:"$dir":) ;;
346	*) val=$dir:$val ;;
347	esac
348	eval $pathvar=\$val
349	eval $export
350	}
351
352	## path-remove [VAR] DIR
353	##
354	## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
355	## error if DIR isn't in VAR.
356	path_remove () {
357	local pathvar export dir val
358	case $# in
359	1) pathvar=PATH dir=$1 export="export PATH" ;;
360	2) pathvar=$1 dir=$2 export=: ;;
361	*) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
362	esac
363	eval val=\$$pathvar
364	case ":$val:" in
365	:"$dir":) val= ;;
366	:"$dir":*) val=${val#$dir:} ;;
367	*:"$dir":) val=${val%:$dir} ;;
368	:"$dir":) val=${val%%:$dir:}:${val#:$dir:} ;;
369	esac
370	eval $pathvar=\$val
371	eval $export
372	}
373
374	## pathhack [-f] +HACK\|-HACK...
375	##
376	## Each HACK refers to a subdirectory of `~/bin/hacks'. A hack name preceded
377	## by `+' adds the directory to the PATH; a `-' removes. Adding a hack
378	## that's already on the PATH doesn't do anything unless `-f' is set, in
379	## which case it gets moved to the beginning. With no arguments, print the
380	## currently installed hacks.
381	pathhack () {
382	local p e force arg hack dir
383	p=$PATH
384	if [ $# -eq 0 ]; then
385	while :; do
386	e=${p%%:*}
387	case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
388	case "$p" in :) p=${p#:} ;; ) break ;; esac
389	done
390	return
391	fi
392	force=nil
393	while [ $# -gt 0 ]; do
394	arg=$1
395	case "$arg" in
396	-f \| --force) force=t; shift; continue ;;
397	--) shift; break ;;
398	[-+]*) ;;
399	*) break; ;;
400	esac
401	hack=${arg#[+-]}
402	dir=$HOME/bin/hacks/$hack
403	if ! [ -d "$dir" ]; then
404	echo "$0: path hack $hack not found"
405	return 1
406	fi
407	case "$arg,$force,:$PATH:" in
408	-,,:"$dir":) path_remove p "$dir" ;;
409	+,t,:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
410	+,nil,:"$dir":*) ;;
411	+,) path_add p "$dir" ;;
412	esac
413	shift
414	done
415	if [ $# -eq 0 ]; then PATH=$p; export PATH
416	else PATH=$p "$@"; fi
417	}
418
419	###--------------------------------------------------------------------------
420	### Finishing touches.
421
4cb8b8da MW	422	## Make sure `$HOME/bin' is on the path.
	423	path_add "$HOME/bin"
	424
6054bdb6 MW	425	## Set the temporary directory again. (A setuid or setgid program may have
6054bdb6 MW	426	## unhelpfully forgotten this for us.)
0a030a39 MW	427	case ${TMPDIR+t} in
	428	t) ;;
	429	*) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
	430	esac
6054bdb6	431
74a53e28 MW	432	## For `root' use -- some simple molly-guards.
	433	case $(id -u) in
	434	0)
	435	alias rm="rm -i" cp="cp -i" mv="mv -i"
	436	set -o noclobber
	437	;;
	438	esac
	439
	440	## Run any local hooks.
	441	__mdw_source_if_exists "$HOME/.shell-local"
	442
	443	###----- That's all, folks --------------------------------------------------