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=$(hostname); dir=""; }
  21
  22 __mdw_set_prompt_pieces () {
  23   local hqual
  24   hqual=""
  25
  26   ## Fancy highlighting in some terminals.
  27   local bold unbold nl gitcolour rccolour uncolour
  28   local host dir more
  29   bold="" unbold="" nl="" gitcolour="" rccolour="" uncolour="" more=""
  30   __mdw_set_prompt_hacks
  31
  32   ## Choose the right delimiters.  Highlight root prompts specially;
  33   ## highlight when I'm running as some other user.  Highlight when this
  34   ## isn't the outermost shell on the terminal.
  35   local left right user u tty
  36   user=${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 or some other interesting augmented
  65   ## environment then point this out.
  66   hqual="$hqual${SCHROOT_CHROOT_NAME+/$SCHROOT_CHROOT_NAME}"
  67   hqual="$hqual${MDW_BUILDENV+/$MDW_BUILDENV}"
  68
  69   ## Put together the main pieces.
  70   __mdw_prompt_left="$nl$bold$left$sec_l$u$host$hqual$sec_r$dir"
  71   __mdw_prompt_git_left="$unbold$gitcolour"
  72   __mdw_prompt_git_right="$uncolour$bold"
  73   __mdw_prompt_rc_left="$unbold$rccolour"
  74   __mdw_prompt_rc_right="$uncolour$bold"
  75   __mdw_prompt_right="$right$unbold"
  76   __mdw_prompt_more=" $more$bold>$unbold "
  77 }
  78
  79 __mdw_set_prompt () {
  80   case "${TERM-dumb}:${INSIDE_EMACS+$INSIDE_EMACS}" in
  81     dumb:)
  82       case $(id -u) in 0) PS1='# ' ;; *) PS1='$ ' ;; esac
  83       PS2='> '
  84       ;;
  85     *)
  86       __mdw_last_rc=$?
  87       local git rc
  88       if type __git_ps1 >/dev/null 2>&1; then
  89         git="$__mdw_prompt_git_left$(__git_ps1)$__mdw_prompt_git_right"
  90       else
  91         git=""
  92       fi
  93       case $__mdw_last_rc in
  94         0) rc="" ;;
  95         *) rc="$__mdw_prompt_rc_left rc=$__mdw_last_rc$__mdw_prompt_rc_right" ;;
  96       esac
  97       PS1="$__mdw_prompt_left$git$rc$__mdw_prompt_right"
  98       PS2="$PS1$__mdw_prompt_more"
  99       unset __mdw_last_rc
 100       ;;
 101   esac
 102 }
 103
 104 __mdw_precmd () {
 105   __mdw_set_prompt
 106   case ${STY+t} in
 107     t) printf "\ek%s\e\\" "$__mdw_shell" ;;
 108   esac
 109 }
 110
 111 __mdw_preexec () {
 112   case ${STY+t} in
 113     t) printf "\ek%s\e\\" "$1" ;;
 114   esac
 115 }
 116
 117 ###--------------------------------------------------------------------------
 118 ### Some handy aliases.
 119
 120 alias cx='chmod +x'
 121 alias which="command -v"
 122 alias rc="rc -l"
 123 rootly () {
 124   case $# in 0) set -- "${SHELL-/bin/sh}" ;; esac
 125   $__MDW_ROOTLY "$@"
 126 }
 127 alias r=rootly
 128 alias re="rootly $EDITOR"
 129 alias pstree="pstree -hl"
 130 alias cdtmp='cd ${TMPDIR-/tmp}'
 131 alias pushtmp='pushd ${TMPDIR-/tmp}'
 132 alias e="$EDITOR"
 133 alias svn="svnwrap svn"
 134 alias @="ssh"
 135 alias make="nice make"
 136 alias gdb="gdb -q"
 137
 138 ###--------------------------------------------------------------------------
 139 ### Colour output.
 140
 141 ## Arrange for `ls' output to be in colour.
 142 if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
 143 else unset LS_COLORS; fi
 144
 145 unalias ls 2>/dev/null || :
 146 ls () {
 147   if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
 148   else command ls "$@"; fi
 149 }
 150
 151 ## Arrange for `grep' output to be in colour.
 152 export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"
 153
 154 greplike () {
 155   local grep=$1; shift
 156   if [ -t 1 ]; then
 157     command $grep ${GREP_COLORS+--color=always} "$@" | mdw-pager
 158   else
 159     command $grep "$@"
 160   fi
 161 }
 162 alias grep="greplike grep"
 163 alias egrep="greplike egrep"
 164 alias fgrep="greplike fgrep"
 165 alias zgrep="greplike zgrep"
 166
 167 ## Arrange for `diff' output to be in colour.
 168 export DIFF_COLORS="hd=1:ln=36:ad=32:de=31"
 169 difflike () {
 170   local diff=$1; shift
 171   if [ -t 1 ]; then
 172     command $diff \
 173             ${DIFF_COLORS+--color=always} \
 174             ${DIFF_COLORS+--palette="$DIFF_COLORS"} \
 175             "$@" | mdw-pager
 176   else
 177     command $diff "$@" | cat
 178   fi
 179 }
 180 alias diff="difflike diff"
 181
 182 ###--------------------------------------------------------------------------
 183 ### Other hacks.
 184
 185 ## Turn off pagers inside Emacs shell buffers.
 186 case "$INSIDE_EMACS" in
 187   2[2-9].*,comint | [3-9][0-9].*,comint) export PAGER=cat ;;
 188 esac
 189
 190 ###--------------------------------------------------------------------------
 191 ### More complicated shell functions.
 192
 193 ## xt [@HOST] XTERM-ARGS
 194 ##
 195 ## Open a terminal, maybe on a remote host.
 196 xt () {
 197   case "$1" in
 198     @*)
 199       local remote=${1#@} title
 200       shift
 201       if [ $# -gt 0 ]; then
 202         title="xterm [$remote] $1"
 203       else
 204         title="xterm [$remote]"
 205       fi
 206       (xterm -title "$title" -e ssh $remote "$@" &)
 207       ;;
 208     *)
 209       (xterm "$@" &)
 210       ;;
 211   esac
 212 }
 213
 214 ## core [y|n]
 215 ##
 216 ## Tweak core dumps on and off, or show the current status.
 217 core () {
 218   case "x$1" in
 219     xon|xy|xyes) ulimit -Sc $(ulimit -Hc) ;;
 220     xoff|xn|xno) ulimit -Sc 0 ;;
 221     x)
 222       local l=$(ulimit -Sc)
 223       case $l in
 224         0) echo "Core dumps disabled" ;;
 225         unlimited) echo "Core dumps enabled" ;;
 226         *) echo "Core dump limit is $l blocks" ;;
 227       esac
 228       ;;
 229     *)
 230       echo >&2 "usage: core [y|n]"
 231       return 1
 232       ;;
 233   esac
 234 }
 235
 236 ## world [NAME]
 237 ##
 238 ## Set current security world to NAME.  With no NAME, print the currently
 239 ## selected world.
 240 world () {
 241   local nfast=${NFAST_HOME-/opt/nfast}
 242   local kmdata
 243   case "$#" in
 244     0)
 245       echo "${NFAST_KMDATA#$nfast/kmdata-}"
 246       ;;
 247     *)
 248       if [ -d "$1" ]; then
 249         kmdata=$1
 250       elif [ -d "$nfast/kmdata-$1" ]; then
 251         kmdata=$nfast/kmdata-$1
 252       else
 253         echo >&2 "world: can't find world $1"
 254         return 1
 255       fi
 256       shift
 257       case "$#" in
 258         0) export NFAST_KMDATA=$kmdata ;;
 259         *) "$@" ;;
 260       esac
 261       ;;
 262   esac
 263 }
 264
 265 ## path-add [VAR] DIR
 266 ##
 267 ## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
 268 ## it's not there already.
 269 path_add () {
 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":*) ;;
 279     *) val=$dir:$val ;;
 280   esac
 281   eval $pathvar=\$val
 282   eval $export
 283 }
 284
 285 ## path-remove [VAR] DIR
 286 ##
 287 ## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
 288 ## error if DIR isn't in VAR.
 289 path_remove () {
 290   local pathvar export dir val
 291   case $# in
 292     1) pathvar=PATH dir=$1 export="export PATH" ;;
 293     2) pathvar=$1 dir=$2 export=: ;;
 294     *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
 295   esac
 296   eval val=\$$pathvar
 297   case ":$val:" in
 298     :"$dir":) val= ;;
 299     :"$dir":*) val=${val#$dir:} ;;
 300     *:"$dir":) val=${val%:$dir} ;;
 301     *:"$dir":*) val=${val%%:$dir:*}:${val#*:$dir:} ;;
 302   esac
 303   eval $pathvar=\$val
 304   eval $export
 305 }
 306
 307 ## pathhack [-f] +HACK|-HACK...
 308 ##
 309 ## Each HACK refers to a subdirectory of `~/bin/hacks'.  A hack name preceded
 310 ## by `+' adds the directory to the PATH; a `-' removes.  Adding a hack
 311 ## that's already on the PATH doesn't do anything unless `-f' is set, in
 312 ## which case it gets moved to the beginning.  With no arguments, print the
 313 ## currently installed hacks.
 314 pathhack () {
 315   local p e force arg hack dir
 316   p=$PATH
 317   if [ $# -eq 0 ]; then
 318     while :; do
 319       e=${p%%:*}
 320       case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
 321       case "$p" in *:*) p=${p#*:} ;; *) break ;; esac
 322     done
 323     return
 324   fi
 325   force=nil
 326   while [ $# -gt 0 ]; do
 327     arg=$1
 328     case "$arg" in
 329       -f | --force) force=t; shift; continue ;;
 330       --) shift; break ;;
 331       [-+]*) ;;
 332       *) break; ;;
 333     esac
 334     hack=${arg#[+-]}
 335     dir=$HOME/bin/hacks/$hack
 336     if ! [ -d "$dir" ]; then
 337       echo "$0: path hack $hack not found"
 338       return 1
 339     fi
 340     case "$arg,$force,:$PATH:" in
 341       -*,*,*:"$dir":*) path_remove p "$dir" ;;
 342       +*,t,*:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
 343       +*,nil,*:"$dir":*) ;;
 344       +*,*) path_add p "$dir" ;;
 345     esac
 346     shift
 347   done
 348   if [ $# -eq 0 ]; then PATH=$p; export PATH
 349   else PATH=$p "$@"; fi
 350 }
 351
 352 ###--------------------------------------------------------------------------
 353 ### Finishing touches.
 354
 355 ## Make sure `$HOME/bin' is on the path.
 356 path_add "$HOME/bin"
 357
 358 ## Set the temporary directory again.  (A setuid or setgid program may have
 359 ## unhelpfully forgotten this for us.)
 360 case ${TMPDIR+t} in
 361   t) ;;
 362   *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
 363 esac
 364
 365 ## For `root' use -- some simple molly-guards.
 366 case $(id -u) in
 367   0)
 368     alias rm="rm -i" cp="cp -i" mv="mv -i"
 369     set -o noclobber
 370     ;;
 371 esac
 372
 373 ## Run any local hooks.
 374 __mdw_source_if_exists "$HOME/.shell-local"
 375
 376 ###----- That's all, folks --------------------------------------------------