mdw@git.distorted.org.uk Git - profile/blob - dot/shell-rc

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