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_set_prompt_hacks () { host=$__mdw_host; dir=""; }
  66
  67 __mdw_set_prompt_pieces () {
  68   local hqual
  69   hqual=""
  70
  71   ## Fancy highlighting in some terminals.
  72   local bold unbold nl gitcolour rccolour uncolour
  73   local host dir more
  74   bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
  75   __mdw_set_prompt_hacks
  76
  77   ## Choose the right delimiters.  Highlight root prompts specially;
  78   ## highlight when I'm running as some other user.  Highlight when this
  79   ## isn't the outermost shell on the terminal.
  80   local left right user u tty
  81   user=${USER-${LOGNAME-$(id -un)}}
  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
 109   ## If this is an schroot environment or some other interesting augmented
 110   ## environment then point this out.
 111   hqual="$hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}"
 112   hqual="$hqual${CROSS_BUILDENV+/$CROSS_BUILDENV}"
 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"
 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_precmd () { printf "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$__mdw_shell"; }
 150 __mdw_xterm_preexec () { printf "\e]2;%s@%s:%s – %s\e\\" "$USER" "$__mdw_host" "$PWD" "$1"; }
 151
 152 __mdw_screen_precmd () { printf "\ek%s\e\\" "$__mdw_shell"; }
 153 __mdw_screen_preexec () { printf "\ek%s\e\\" "$1"; }
 154
 155 if [ -t 0 ]; then
 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,*)
 162       __mdw_addhook __mdw_precmd_hook __mdw_screen_precmd
 163       __mdw_addhook __mdw_preexec_hook __mdw_screen_preexec
 164       ;;
 165   esac
 166   case ${__mdw_precmd_hook+t} in
 167     t) __mdw_addhook __mdw_precmd_hook __mdw_set_prompt ;;
 168   esac
 169 fi
 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"
 189 alias make="nice make"
 190 alias gdb="gdb -q"
 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
 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
 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
 409 ## Make sure `$HOME/bin' is on the path.
 410 path_add "$HOME/bin"
 411
 412 ## Set the temporary directory again.  (A setuid or setgid program may have
 413 ## unhelpfully forgotten this for us.)
 414 case ${TMPDIR+t} in
 415   t) ;;
 416   *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
 417 esac
 418
 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 --------------------------------------------------