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