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 ### 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" "$@"; done
  59 }
  60
  61 ###--------------------------------------------------------------------------
  62 ### Prompt machinery.
  63
  64 __mdw_host=$(hostname)
  65 __mdw_hqual=
  66 __mdw_hqual=$__mdw_hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}
  67 __mdw_hqual=$__mdw_hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}
  68 __mdw_set_prompt_hacks () { host=$__mdw_host; dir=""; }
  69
  70 __mdw_system=$(uname -s)
  71 : ${USER-${LOGNAME-$(id -un)}}
  72 __mdw_user=$USER
  73
  74 case $(id -u) in
  75   0)
  76     __mdw_rootp=t
  77     ;;
  78   *)
  79     case $__mdw_system in
  80       CYGWIN_*)
  81         case " $(id -G) " in
  82           *" 544 "*) __mdw_rootp=t __mdw_user="$__mdw_user%admin" ;;
  83           *) __mdw_rootp=nil ;;
  84         esac
  85         ;;
  86       *)
  87         __mdw_rootp=nil
  88         ;;
  89     esac
  90 esac
  91
  92 __mdw_set_prompt_pieces () {
  93
  94   ## Fancy highlighting in some terminals.
  95   local bold unbold nl gitcolour rccolour uncolour
  96   local host dir more
  97   bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
  98   __mdw_set_prompt_hacks
  99
 100   ## Choose the right delimiters.  Highlight root prompts specially;
 101   ## highlight when I'm running as some other user.  Highlight when this
 102   ## isn't the outermost shell on the terminal.
 103   local left right u tty
 104   case $__mdw_rootp in
 105     t)
 106       left=$(echo « | iconv -f UTF-8 -t //translit)
 107       right=$(echo » | iconv -f UTF-8 -t //translit)
 108       ;;
 109     nil)
 110       case $USER in
 111         mdw | mwooding | nemo) u="" left="[" right="]" ;;
 112         *) u="$__mdw_user@" left="{" right="}" ;;
 113       esac
 114       tty=$(tty)
 115       case "$__mdw_tty" in
 116         "$tty") left="<" right=">" ;;
 117         *) __mdw_tty=$tty; export __mdw_tty ;;
 118       esac
 119       ;;
 120   esac
 121
 122   ## If this session is insecure then highlight that.
 123   local sec_l sec_r h
 124   h=$(hostname)
 125   case ${SSH_CLIENT-nil},${SCHROOT_CHROOT_NAME-nil},$__mdw_sechost in
 126     nil,nil,"$h") sec_l="" sec_r="" ;;
 127     nil,nil,*) sec_l="(" sec_r=")" ;;
 128     *) sec_l="" sec_r=""
 129   esac
 130
 131   ## If this is an schroot environment or some other interesting augmented
 132   ## environment then point this out.
 133
 134   ## Put together the main pieces.
 135   __mdw_prompt_left="$nl$bold$left$sec_l$u$host$__mdw_hqual$sec_r$dir"
 136   __mdw_prompt_git_left="$unbold$gitcolour"
 137   __mdw_prompt_git_right="$uncolour$bold"
 138   __mdw_prompt_rc_left="$unbold$rccolour"
 139   __mdw_prompt_rc_right="$uncolour$bold"
 140   __mdw_prompt_right="$right$unbold"
 141   __mdw_prompt_more=" $more$bold>$unbold "
 142 }
 143
 144 __mdw_set_prompt () {
 145   case "${TERM-dumb}:${INSIDE_EMACS+$INSIDE_EMACS}" in
 146     dumb:)
 147       case $(id -u) in 0) PS1='# ' ;; *) PS1='$ ' ;; esac
 148       PS2='> '
 149       ;;
 150     *)
 151       __mdw_last_rc=$?
 152       local git rc
 153       if type __git_ps1 >/dev/null 2>&1; then
 154         git="$__mdw_prompt_git_left$(__git_ps1)$__mdw_prompt_git_right"
 155       else
 156         git=""
 157       fi
 158       case $__mdw_last_rc in
 159         0) rc="" ;;
 160         *) rc="$__mdw_prompt_rc_left rc=$__mdw_last_rc$__mdw_prompt_rc_right" ;;
 161       esac
 162       PS1="$__mdw_prompt_left$git$rc$__mdw_prompt_right"
 163       PS2="$PS1$__mdw_prompt_more"
 164       unset __mdw_last_rc
 165       ;;
 166   esac
 167 }
 168
 169 __mdw_xterm_settitle () {
 170   printf >/dev/tty \
 171     "\e]2;%s@%s:%s – %s\e\\" \
 172     "$__mdw_user" "$__mdw_host$__mdw_hqual" "$PWD" \
 173     "$1"
 174 }
 175 __mdw_xterm_precmd () { __mdw_xterm_settitle "$__mdw_shell"; }
 176 __mdw_xterm_preexec () { __mdw_xterm_settitle "$1"; }
 177
 178 __mdw_screen_settitle () {
 179   printf >/dev/tty \
 180     "\ek%s\e\\" \
 181     "$1"
 182 }
 183 __mdw_screen_precmd () { __mdw_screen_settitle "$__mdw_shell"; }
 184 __mdw_screen_preexec () { __mdw_screen_settitle "$1"; }
 185
 186 if [ -t 0 ]; then
 187   case ${STY+t},${__mdw_precmd_hook+t},${__mdw_preexec_hook+t},${TERM} in
 188     ,t,t,xterm*)
 189       __mdw_addhook __mdw_precmd_hook __mdw_xterm_precmd
 190       __mdw_addhook __mdw_preexec_hook __mdw_xterm_preexec
 191       ;;
 192     t,t,t,*)
 193       __mdw_addhook __mdw_precmd_hook __mdw_screen_precmd
 194       __mdw_addhook __mdw_preexec_hook __mdw_screen_preexec
 195       ;;
 196   esac
 197   case ${__mdw_precmd_hook+t} in
 198     t) __mdw_addhook __mdw_precmd_hook __mdw_set_prompt ;;
 199   esac
 200 fi
 201
 202 ###--------------------------------------------------------------------------
 203 ### Some handy aliases.
 204
 205 alias cx='chmod +x'
 206 alias which="command -v"
 207 alias rc="rc -l"
 208 rootly () {
 209   case $# in 0) set -- "${SHELL-/bin/sh}" ;; esac
 210   $__MDW_ROOTLY "$@"
 211 }
 212 alias r=rootly
 213 alias re="rootly $EDITOR"
 214 alias pstree="pstree -hl"
 215 alias cdtmp='cd ${TMPDIR-/tmp}'
 216 alias pushtmp='pushd ${TMPDIR-/tmp}'
 217 alias e="$EDITOR"
 218 alias svn="svnwrap svn"
 219 alias @="ssh"
 220 alias make="nice make"
 221 alias cross-run="nice cross-run"
 222 alias gdb="gdb -q"
 223
 224 ###--------------------------------------------------------------------------
 225 ### Colour output.
 226
 227 ## Arrange for `ls' output to be in colour.
 228 if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
 229 else unset LS_COLORS; fi
 230
 231 unalias ls 2>/dev/null || :
 232 ls () {
 233   if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
 234   else command ls "$@"; fi
 235 }
 236
 237 ## Arrange for `grep' output to be in colour.
 238 export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"
 239
 240 greplike () {
 241   local grep=$1; shift
 242   if [ -t 1 ]; then
 243     command $grep ${GREP_COLORS+--color=always} "$@" | mdw-pager
 244   else
 245     command $grep "$@"
 246   fi
 247 }
 248 alias grep="greplike grep"
 249 alias egrep="greplike egrep"
 250 alias fgrep="greplike fgrep"
 251 alias zgrep="greplike zgrep"
 252
 253 ## Arrange for `diff' output to be in colour.
 254 export DIFF_COLORS="hd=1:ln=36:ad=32:de=31"
 255 difflike () {
 256   local diff=$1; shift
 257   if [ -t 1 ]; then
 258     command $diff \
 259             ${DIFF_COLORS+--color=always} \
 260             ${DIFF_COLORS+--palette="$DIFF_COLORS"} \
 261             "$@" | mdw-pager
 262   else
 263     command $diff "$@" | cat
 264   fi
 265 }
 266 alias diff="difflike diff"
 267
 268 ###--------------------------------------------------------------------------
 269 ### Other hacks.
 270
 271 ## Turn off pagers inside Emacs shell buffers.
 272 case "$INSIDE_EMACS" in
 273   2[2-9].*,comint | [3-9][0-9].*,comint) export PAGER=cat ;;
 274 esac
 275
 276 ###--------------------------------------------------------------------------
 277 ### More complicated shell functions.
 278
 279 ## xt [@HOST] XTERM-ARGS
 280 ##
 281 ## Open a terminal, maybe on a remote host.
 282 xt () {
 283   case "$1" in
 284     @*)
 285       local remote=${1#@} title
 286       shift
 287       if [ $# -gt 0 ]; then
 288         title="xterm [$remote] $1"
 289       else
 290         title="xterm [$remote]"
 291       fi
 292       (xterm -title "$title" -e ssh $remote "$@" &)
 293       ;;
 294     *)
 295       (xterm "$@" &)
 296       ;;
 297   esac
 298 }
 299
 300 ## core [y|n]
 301 ##
 302 ## Tweak core dumps on and off, or show the current status.
 303 core () {
 304   case "x$1" in
 305     xon|xy|xyes) ulimit -Sc $(ulimit -Hc) ;;
 306     xoff|xn|xno) ulimit -Sc 0 ;;
 307     x)
 308       local l=$(ulimit -Sc)
 309       case $l in
 310         0) echo "Core dumps disabled" ;;
 311         unlimited) echo "Core dumps enabled" ;;
 312         *) echo "Core dump limit is $l blocks" ;;
 313       esac
 314       ;;
 315     *)
 316       echo >&2 "usage: core [y|n]"
 317       return 1
 318       ;;
 319   esac
 320 }
 321
 322 ## world [NAME]
 323 ##
 324 ## Set current security world to NAME.  With no NAME, print the currently
 325 ## selected world.
 326 world () {
 327   local nfast=${NFAST_HOME-/opt/nfast}
 328   local kmdata
 329   case "$#" in
 330     0)
 331       echo "${NFAST_KMDATA#$nfast/kmdata-}"
 332       ;;
 333     *)
 334       if [ -d "$1" ]; then
 335         kmdata=$1
 336       elif [ -d "$nfast/kmdata-$1" ]; then
 337         kmdata=$nfast/kmdata-$1
 338       else
 339         echo >&2 "world: can't find world $1"
 340         return 1
 341       fi
 342       shift
 343       case "$#" in
 344         0) export NFAST_KMDATA=$kmdata ;;
 345         *) "$@" ;;
 346       esac
 347       ;;
 348   esac
 349 }
 350
 351 ## path-add [VAR] DIR
 352 ##
 353 ## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
 354 ## it's not there already.
 355 path_add () {
 356   local pathvar export dir val
 357   case $# in
 358     1) pathvar=PATH dir=$1 export="export PATH" ;;
 359     2) pathvar=$1 dir=$2 export=: ;;
 360     *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
 361   esac
 362   eval val=\$$pathvar
 363   case ":$val:" in
 364     *:"$dir":*) ;;
 365     *) val=$dir:$val ;;
 366   esac
 367   eval $pathvar=\$val
 368   eval $export
 369 }
 370
 371 ## path-remove [VAR] DIR
 372 ##
 373 ## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
 374 ## error if DIR isn't in VAR.
 375 path_remove () {
 376   local pathvar export dir val
 377   case $# in
 378     1) pathvar=PATH dir=$1 export="export PATH" ;;
 379     2) pathvar=$1 dir=$2 export=: ;;
 380     *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
 381   esac
 382   eval val=\$$pathvar
 383   case ":$val:" in
 384     :"$dir":) val= ;;
 385     :"$dir":*) val=${val#$dir:} ;;
 386     *:"$dir":) val=${val%:$dir} ;;
 387     *:"$dir":*) val=${val%%:$dir:*}:${val#*:$dir:} ;;
 388   esac
 389   eval $pathvar=\$val
 390   eval $export
 391 }
 392
 393 ## pathhack [-f] +HACK|-HACK...
 394 ##
 395 ## Each HACK refers to a subdirectory of `~/bin/hacks'.  A hack name preceded
 396 ## by `+' adds the directory to the PATH; a `-' removes.  Adding a hack
 397 ## that's already on the PATH doesn't do anything unless `-f' is set, in
 398 ## which case it gets moved to the beginning.  With no arguments, print the
 399 ## currently installed hacks.
 400 pathhack () {
 401   local p e force arg hack dir
 402   p=$PATH
 403   if [ $# -eq 0 ]; then
 404     while :; do
 405       e=${p%%:*}
 406       case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
 407       case "$p" in *:*) p=${p#*:} ;; *) break ;; esac
 408     done
 409     return
 410   fi
 411   force=nil
 412   while [ $# -gt 0 ]; do
 413     arg=$1
 414     case "$arg" in
 415       -f | --force) force=t; shift; continue ;;
 416       --) shift; break ;;
 417       [-+]*) ;;
 418       *) break; ;;
 419     esac
 420     hack=${arg#[+-]}
 421     dir=$HOME/bin/hacks/$hack
 422     if ! [ -d "$dir" ]; then
 423       echo "$0: path hack $hack not found"
 424       return 1
 425     fi
 426     case "$arg,$force,:$PATH:" in
 427       -*,*,*:"$dir":*) path_remove p "$dir" ;;
 428       +*,t,*:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
 429       +*,nil,*:"$dir":*) ;;
 430       +*,*) path_add p "$dir" ;;
 431     esac
 432     shift
 433   done
 434   if [ $# -eq 0 ]; then PATH=$p; export PATH
 435   else PATH=$p "$@"; fi
 436 }
 437
 438 ###--------------------------------------------------------------------------
 439 ### Finishing touches.
 440
 441 ## Make sure `$HOME/bin' is on the path.
 442 path_add "$HOME/bin"
 443
 444 ## Set the temporary directory again.  (A setuid or setgid program may have
 445 ## unhelpfully forgotten this for us.)
 446 case ${TMPDIR+t} in
 447   t) ;;
 448   *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
 449 esac
 450
 451 ## For `root' use -- some simple molly-guards.
 452 case $(id -u) in
 453   0)
 454     alias rm="rm -i" cp="cp -i" mv="mv -i"
 455     set -o noclobber
 456     ;;
 457 esac
 458
 459 ## Run any local hooks.
 460 __mdw_source_if_exists "$HOME/.shell-local"
 461
 462 ###----- That's all, folks --------------------------------------------------