[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=$(hostname)
__mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }

__mdw_set_prompt_pieces () {
  local hqual
  hqual=""

  ## 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 user u tty
  user=${USER-${LOGNAME-$(id -un)}}
  case $(id -u) in
    0)
      left=$(echo « | iconv -f UTF-8 -t //translit)
      right=$(echo » | iconv -f UTF-8 -t //translit)
      ;;
    *)
      case $user in
	mdw | mwooding | nemo) u="" left="[" right="]" ;;
	*) u="$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.
  hqual="$hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}"
  hqual="$hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}"

  ## Put together the main pieces.
  __mdw_prompt_left="$nl$bold$left$sec_l$u$host$hqual$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_precmd () { printf >/dev/tty "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$__mdw_shell"; }
__mdw_xterm_preexec () { printf >/dev/tty "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$1"; }

__mdw_screen_precmd () { printf >/dev/tty "\ek%s\e\\" "$__mdw_shell"; }
__mdw_screen_preexec () { printf >/dev/tty "\ek%s\e\\" "$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 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" "$@"; done
	59	}
	60
	61	###--------------------------------------------------------------------------
74a53e28 MW	62	### Prompt machinery.
74a53e28 MW	63
2bbac58c MW	64	__mdw_host=$(hostname)
2bbac58c MW	65	__mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }
74a53e28 MW	66
	67	__mdw_set_prompt_pieces () {
	68	local hqual
	69	hqual=""
	70
	71	## Fancy highlighting in some terminals.
	72	local bold unbold nl gitcolour rccolour uncolour
55360ba3 MW	73	local host dir more
55360ba3 MW	74	bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
74a53e28 MW	75	__mdw_set_prompt_hacks
	76
	77	## Choose the right delimiters. Highlight root prompts specially;
	78	## highlight when I'm running as some other user. Highlight when this
	79	## isn't the outermost shell on the terminal.
	80	local left right user u tty
2ab43296	81	user=${USER-${LOGNAME-$(id -un)}}
74a53e28 MW	82	case $(id -u) in
	83	0)
	84	left=$(echo « \| iconv -f UTF-8 -t //translit)
	85	right=$(echo » \| iconv -f UTF-8 -t //translit)
	86	;;
	87	*)
	88	case $user in
	89	mdw \| mwooding \| nemo) u="" left="[" right="]" ;;
	90	*) u="$user@" left="{" right="}" ;;
	91	esac
	92	tty=$(tty)
	93	case "$__mdw_tty" in
	94	"$tty") left="<" right=">" ;;
	95	*) __mdw_tty=$tty; export __mdw_tty ;;
	96	esac
	97	;;
	98	esac
	99
	100	## If this session is insecure then highlight that.
	101	local sec_l sec_r h
	102	h=$(hostname)
	103	case ${SSH_CLIENT-nil},${SCHROOT_CHROOT_NAME-nil},$__mdw_sechost in
	104	nil,nil,"$h") sec_l="" sec_r="" ;;
	105	nil,nil,*) sec_l="(" sec_r=")" ;;
	106	*) sec_l="" sec_r=""
	107	esac
	108
1a1af55e MW	109	## If this is an schroot environment or some other interesting augmented
1a1af55e MW	110	## environment then point this out.
74a53e28	111	hqual="$hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}"
1e0b3449	112	hqual="$hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}"
74a53e28 MW	113
	114	## Put together the main pieces.
	115	__mdw_prompt_left="$nl$bold$left$sec_l$u$host$hqual$sec_r$dir"
	116	__mdw_prompt_git_left="$unbold$gitcolour"
	117	__mdw_prompt_git_right="$uncolour$bold"
	118	__mdw_prompt_rc_left="$unbold$rccolour"
	119	__mdw_prompt_rc_right="$uncolour$bold"
	120	__mdw_prompt_right="$right$unbold"
55360ba3	121	__mdw_prompt_more=" $more$bold>$unbold "
74a53e28 MW	122	}
	123
	124	__mdw_set_prompt () {
062b450d	125	case "${TERM-dumb}:${INSIDE_EMACS+$INSIDE_EMACS}" in
d281a650	126	dumb:)
55bd0261 MW	127	case $(id -u) in 0) PS1='# ' ;; *) PS1='$ ' ;; esac
	128	PS2='> '
	129	;;
	130	*)
	131	__mdw_last_rc=$?
	132	local git rc
	133	if type __git_ps1 >/dev/null 2>&1; then
	134	git="$__mdw_prompt_git_left$(__git_ps1)$__mdw_prompt_git_right"
	135	else
	136	git=""
	137	fi
	138	case $__mdw_last_rc in
	139	0) rc="" ;;
	140	*) rc="$__mdw_prompt_rc_left rc=$__mdw_last_rc$__mdw_prompt_rc_right" ;;
	141	esac
	142	PS1="$__mdw_prompt_left$git$rc$__mdw_prompt_right"
55360ba3	143	PS2="$PS1$__mdw_prompt_more"
55bd0261 MW	144	unset __mdw_last_rc
55bd0261 MW	145	;;
74a53e28	146	esac
74a53e28 MW	147	}
74a53e28 MW	148
83aea396 MW	149	__mdw_xterm_precmd () { printf >/dev/tty "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$__mdw_shell"; }
83aea396 MW	150	__mdw_xterm_preexec () { printf >/dev/tty "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$1"; }
05f8a57d	151
83aea396 MW	152	__mdw_screen_precmd () { printf >/dev/tty "\ek%s\e\\" "$__mdw_shell"; }
83aea396 MW	153	__mdw_screen_preexec () { printf >/dev/tty "\ek%s\e\\" "$1"; }
74a53e28	154
4877b8d8	155	if [ -t 0 ]; then
05f8a57d MW	156	case ${STY+t},${__mdw_precmd_hook+t},${__mdw_preexec_hook+t},${TERM} in
	157	,t,t,xterm*)
	158	__mdw_addhook __mdw_precmd_hook __mdw_xterm_precmd
	159	__mdw_addhook __mdw_preexec_hook __mdw_xterm_preexec
	160	;;
	161	t,t,t,*)
4877b8d8 MW	162	__mdw_addhook __mdw_precmd_hook __mdw_screen_precmd
	163	__mdw_addhook __mdw_preexec_hook __mdw_screen_preexec
	164	;;
74a53e28	165	esac
4877b8d8 MW	166	case ${__mdw_precmd_hook+t} in
	167	t) __mdw_addhook __mdw_precmd_hook __mdw_set_prompt ;;
	168	esac
	169	fi
74a53e28 MW	170
	171	###--------------------------------------------------------------------------
	172	### Some handy aliases.
	173
	174	alias cx='chmod +x'
	175	alias which="command -v"
	176	alias rc="rc -l"
	177	rootly () {
	178	case $# in 0) set -- "${SHELL-/bin/sh}" ;; esac
	179	$__MDW_ROOTLY "$@"
	180	}
	181	alias r=rootly
	182	alias re="rootly $EDITOR"
	183	alias pstree="pstree -hl"
	184	alias cdtmp='cd ${TMPDIR-/tmp}'
	185	alias pushtmp='pushd ${TMPDIR-/tmp}'
	186	alias e="$EDITOR"
	187	alias svn="svnwrap svn"
	188	alias @="ssh"
daeece4b	189	alias make="nice make"
8712436f	190	alias gdb="gdb -q"
74a53e28 MW	191
	192	###--------------------------------------------------------------------------
	193	### Colour output.
	194
	195	## Arrange for `ls' output to be in colour.
	196	if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
	197	else unset LS_COLORS; fi
	198
	199	unalias ls 2>/dev/null \|\| :
	200	ls () {
	201	if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
	202	else command ls "$@"; fi
	203	}
	204
	205	## Arrange for `grep' output to be in colour.
	206	export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"
	207
	208	greplike () {
	209	local grep=$1; shift
	210	if [ -t 1 ]; then
	211	command $grep ${GREP_COLORS+--color=always} "$@" \| mdw-pager
	212	else
	213	command $grep "$@"
	214	fi
	215	}
	216	alias grep="greplike grep"
	217	alias egrep="greplike egrep"
	218	alias fgrep="greplike fgrep"
	219	alias zgrep="greplike zgrep"
	220
049cd015 MW	221	## Arrange for `diff' output to be in colour.
	222	export DIFF_COLORS="hd=1:ln=36:ad=32:de=31"
	223	difflike () {
	224	local diff=$1; shift
	225	if [ -t 1 ]; then
	226	command $diff \
	227	${DIFF_COLORS+--color=always} \
	228	${DIFF_COLORS+--palette="$DIFF_COLORS"} \
	229	"$@" \| mdw-pager
	230	else
	231	command $diff "$@" \| cat
	232	fi
	233	}
	234	alias diff="difflike diff"
	235
74a53e28 MW	236	###--------------------------------------------------------------------------
	237	### Other hacks.
	238
	239	## Turn off pagers inside Emacs shell buffers.
	240	case "$INSIDE_EMACS" in
	241	2[2-9].,comint \| [3-9][0-9].,comint) export PAGER=cat ;;
	242	esac
	243
	244	###--------------------------------------------------------------------------
	245	### More complicated shell functions.
	246
	247	## xt [@HOST] XTERM-ARGS
	248	##
	249	## Open a terminal, maybe on a remote host.
	250	xt () {
	251	case "$1" in
	252	@*)
	253	local remote=${1#@} title
	254	shift
	255	if [ $# -gt 0 ]; then
	256	title="xterm [$remote] $1"
	257	else
	258	title="xterm [$remote]"
	259	fi
	260	(xterm -title "$title" -e ssh $remote "$@" &)
	261	;;
	262	*)
	263	(xterm "$@" &)
	264	;;
	265	esac
	266	}
	267
	268	## core [y\|n]
	269	##
	270	## Tweak core dumps on and off, or show the current status.
	271	core () {
	272	case "x$1" in
	273	xon\|xy\|xyes) ulimit -Sc $(ulimit -Hc) ;;
	274	xoff\|xn\|xno) ulimit -Sc 0 ;;
	275	x)
	276	local l=$(ulimit -Sc)
	277	case $l in
	278	0) echo "Core dumps disabled" ;;
	279	unlimited) echo "Core dumps enabled" ;;
	280	*) echo "Core dump limit is $l blocks" ;;
	281	esac
	282	;;
	283	*)
	284	echo >&2 "usage: core [y\|n]"
	285	return 1
	286	;;
	287	esac
	288	}
	289
	290	## world [NAME]
	291	##
	292	## Set current security world to NAME. With no NAME, print the currently
	293	## selected world.
	294	world () {
	295	local nfast=${NFAST_HOME-/opt/nfast}
	296	local kmdata
	297	case "$#" in
	298	0)
	299	echo "${NFAST_KMDATA#$nfast/kmdata-}"
300	;;
301	*)
302	if [ -d "$1" ]; then
303	kmdata=$1
304	elif [ -d "$nfast/kmdata-$1" ]; then
305	kmdata=$nfast/kmdata-$1
306	else
307	echo >&2 "world: can't find world $1"
308	return 1
309	fi
310	shift
311	case "$#" in
312	0) export NFAST_KMDATA=$kmdata ;;
313	*) "$@" ;;
314	esac
315	;;
316	esac
317	}
318
319	## path-add [VAR] DIR
320	##
321	## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
322	## it's not there already.
323	path_add () {
324	local pathvar export dir val
325	case $# in
326	1) pathvar=PATH dir=$1 export="export PATH" ;;
327	2) pathvar=$1 dir=$2 export=: ;;
328	*) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
329	esac
330	eval val=\$$pathvar
331	case ":$val:" in
332	:"$dir":) ;;
333	*) val=$dir:$val ;;
334	esac
335	eval $pathvar=\$val
336	eval $export
337	}
338
339	## path-remove [VAR] DIR
340	##
341	## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
342	## error if DIR isn't in VAR.
343	path_remove () {
344	local pathvar export dir val
345	case $# in
346	1) pathvar=PATH dir=$1 export="export PATH" ;;
347	2) pathvar=$1 dir=$2 export=: ;;
348	*) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
349	esac
350	eval val=\$$pathvar
351	case ":$val:" in
352	:"$dir":) val= ;;
353	:"$dir":*) val=${val#$dir:} ;;
354	*:"$dir":) val=${val%:$dir} ;;
355	:"$dir":) val=${val%%:$dir:}:${val#:$dir:} ;;
356	esac
357	eval $pathvar=\$val
358	eval $export
359	}
360
361	## pathhack [-f] +HACK\|-HACK...
362	##
363	## Each HACK refers to a subdirectory of `~/bin/hacks'. A hack name preceded
364	## by `+' adds the directory to the PATH; a `-' removes. Adding a hack
365	## that's already on the PATH doesn't do anything unless `-f' is set, in
366	## which case it gets moved to the beginning. With no arguments, print the
367	## currently installed hacks.
368	pathhack () {
369	local p e force arg hack dir
370	p=$PATH
371	if [ $# -eq 0 ]; then
372	while :; do
373	e=${p%%:*}
374	case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
375	case "$p" in :) p=${p#:} ;; ) break ;; esac
376	done
377	return
378	fi
379	force=nil
380	while [ $# -gt 0 ]; do
381	arg=$1
382	case "$arg" in
383	-f \| --force) force=t; shift; continue ;;
384	--) shift; break ;;
385	[-+]*) ;;
386	*) break; ;;
387	esac
388	hack=${arg#[+-]}
389	dir=$HOME/bin/hacks/$hack
390	if ! [ -d "$dir" ]; then
391	echo "$0: path hack $hack not found"
392	return 1
393	fi
394	case "$arg,$force,:$PATH:" in
395	-,,:"$dir":) path_remove p "$dir" ;;
396	+,t,:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
397	+,nil,:"$dir":*) ;;
398	+,) path_add p "$dir" ;;
399	esac
400	shift
401	done
402	if [ $# -eq 0 ]; then PATH=$p; export PATH
403	else PATH=$p "$@"; fi
404	}
405
406	###--------------------------------------------------------------------------
407	### Finishing touches.
408
4cb8b8da MW	409	## Make sure `$HOME/bin' is on the path.
	410	path_add "$HOME/bin"
	411
6054bdb6 MW	412	## Set the temporary directory again. (A setuid or setgid program may have
6054bdb6 MW	413	## unhelpfully forgotten this for us.)
0a030a39 MW	414	case ${TMPDIR+t} in
	415	t) ;;
	416	*) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
	417	esac
6054bdb6	418
74a53e28 MW	419	## For `root' use -- some simple molly-guards.
	420	case $(id -u) in
	421	0)
	422	alias rm="rm -i" cp="cp -i" mv="mv -i"
	423	set -o noclobber
	424	;;
	425	esac
	426
	427	## Run any local hooks.
	428	__mdw_source_if_exists "$HOME/.shell-local"
	429
	430	###----- That's all, folks --------------------------------------------------