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