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${MDW_BUILDENV+/$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
 137 ###--------------------------------------------------------------------------
 138 ### Colour output.
 139
 140 ## Arrange for `ls' output to be in colour.
 141 if __mdw_programp dircolors; then eval $(dircolors -b "$HOME/.dircolors")
 142 else unset LS_COLORS; fi
 143
 144 unalias ls 2>/dev/null || :
 145 ls () {
 146   if [ -t 1 ]; then command ls $LS_OPTIONS ${LS_COLORS+--color=auto} "$@"
 147   else command ls "$@"; fi
 148 }
 149
 150 ## Arrange for `grep' output to be in colour.
 151 export GREP_COLORS="mt=01;31:ms=01;31:mc=031;31:fn=36:ln=36:bn=36:se=34"
 152
 153 greplike () {
 154   local grep=$1; shift
 155   if [ -t 1 ]; then
 156     command $grep ${GREP_COLORS+--color=always} "$@" | mdw-pager
 157   else
 158     command $grep "$@"
 159   fi
 160 }
 161 alias grep="greplike grep"
 162 alias egrep="greplike egrep"
 163 alias fgrep="greplike fgrep"
 164 alias zgrep="greplike zgrep"
 165
 166 ###--------------------------------------------------------------------------
 167 ### Other hacks.
 168
 169 ## Turn off pagers inside Emacs shell buffers.
 170 case "$INSIDE_EMACS" in
 171   2[2-9].*,comint | [3-9][0-9].*,comint) export PAGER=cat ;;
 172 esac
 173
 174 ###--------------------------------------------------------------------------
 175 ### More complicated shell functions.
 176
 177 ## xt [@HOST] XTERM-ARGS
 178 ##
 179 ## Open a terminal, maybe on a remote host.
 180 xt () {
 181   case "$1" in
 182     @*)
 183       local remote=${1#@} title
 184       shift
 185       if [ $# -gt 0 ]; then
 186         title="xterm [$remote] $1"
 187       else
 188         title="xterm [$remote]"
 189       fi
 190       (xterm -title "$title" -e ssh $remote "$@" &)
 191       ;;
 192     *)
 193       (xterm "$@" &)
 194       ;;
 195   esac
 196 }
 197
 198 ## core [y|n]
 199 ##
 200 ## Tweak core dumps on and off, or show the current status.
 201 core () {
 202   case "x$1" in
 203     xon|xy|xyes) ulimit -Sc $(ulimit -Hc) ;;
 204     xoff|xn|xno) ulimit -Sc 0 ;;
 205     x)
 206       local l=$(ulimit -Sc)
 207       case $l in
 208         0) echo "Core dumps disabled" ;;
 209         unlimited) echo "Core dumps enabled" ;;
 210         *) echo "Core dump limit is $l blocks" ;;
 211       esac
 212       ;;
 213     *)
 214       echo >&2 "usage: core [y|n]"
 215       return 1
 216       ;;
 217   esac
 218 }
 219
 220 ## world [NAME]
 221 ##
 222 ## Set current security world to NAME.  With no NAME, print the currently
 223 ## selected world.
 224 world () {
 225   local nfast=${NFAST_HOME-/opt/nfast}
 226   local kmdata
 227   case "$#" in
 228     0)
 229       echo "${NFAST_KMDATA#$nfast/kmdata-}"
 230       ;;
 231     *)
 232       if [ -d "$1" ]; then
 233         kmdata=$1
 234       elif [ -d "$nfast/kmdata-$1" ]; then
 235         kmdata=$nfast/kmdata-$1
 236       else
 237         echo >&2 "world: can't find world $1"
 238         return 1
 239       fi
 240       shift
 241       case "$#" in
 242         0) export NFAST_KMDATA=$kmdata ;;
 243         *) "$@" ;;
 244       esac
 245       ;;
 246   esac
 247 }
 248
 249 ## path-add [VAR] DIR
 250 ##
 251 ## Add DIR to the beginning of PATH-like variable VAR (defaults to PATH) if
 252 ## it's not there already.
 253 path_add () {
 254   local pathvar export dir val
 255   case $# in
 256     1) pathvar=PATH dir=$1 export="export PATH" ;;
 257     2) pathvar=$1 dir=$2 export=: ;;
 258     *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
 259   esac
 260   eval val=\$$pathvar
 261   case ":$val:" in
 262     *:"$dir":*) ;;
 263     *) val=$dir:$val ;;
 264   esac
 265   eval $pathvar=\$val
 266   eval $export
 267 }
 268
 269 ## path-remove [VAR] DIR
 270 ##
 271 ## Remove DIR from PATH-like variable VAR (defaults to PATH); it's not an
 272 ## error if DIR isn't in VAR.
 273 path_remove () {
 274   local pathvar export dir val
 275   case $# in
 276     1) pathvar=PATH dir=$1 export="export PATH" ;;
 277     2) pathvar=$1 dir=$2 export=: ;;
 278     *) echo >&2 "Usage: $0 [VAR] DIR"; return 1 ;;
 279   esac
 280   eval val=\$$pathvar
 281   case ":$val:" in
 282     :"$dir":) val= ;;
 283     :"$dir":*) val=${val#$dir:} ;;
 284     *:"$dir":) val=${val%:$dir} ;;
 285     *:"$dir":*) val=${val%%:$dir:*}:${val#*:$dir:} ;;
 286   esac
 287   eval $pathvar=\$val
 288   eval $export
 289 }
 290
 291 ## pathhack [-f] +HACK|-HACK...
 292 ##
 293 ## Each HACK refers to a subdirectory of `~/bin/hacks'.  A hack name preceded
 294 ## by `+' adds the directory to the PATH; a `-' removes.  Adding a hack
 295 ## that's already on the PATH doesn't do anything unless `-f' is set, in
 296 ## which case it gets moved to the beginning.  With no arguments, print the
 297 ## currently installed hacks.
 298 pathhack () {
 299   local p e force arg hack dir
 300   p=$PATH
 301   if [ $# -eq 0 ]; then
 302     while :; do
 303       e=${p%%:*}
 304       case "$e" in "$HOME/bin/hacks/"*) echo ${e#$HOME/bin/hacks/} ;; esac
 305       case "$p" in *:*) p=${p#*:} ;; *) break ;; esac
 306     done
 307     return
 308   fi
 309   force=nil
 310   while [ $# -gt 0 ]; do
 311     arg=$1
 312     case "$arg" in
 313       -f | --force) force=t; shift; continue ;;
 314       --) shift; break ;;
 315       [-+]*) ;;
 316       *) break; ;;
 317     esac
 318     hack=${arg#[+-]}
 319     dir=$HOME/bin/hacks/$hack
 320     if ! [ -d "$dir" ]; then
 321       echo "$0: path hack $hack not found"
 322       return 1
 323     fi
 324     case "$arg,$force,:$PATH:" in
 325       -*,*,*:"$dir":*) path_remove p "$dir" ;;
 326       +*,t,*:"$dir":*) path_remove p "$dir"; path_add p "$dir" ;;
 327       +*,nil,*:"$dir":*) ;;
 328       +*,*) path_add p "$dir" ;;
 329     esac
 330     shift
 331   done
 332   if [ $# -eq 0 ]; then PATH=$p; export PATH
 333   else PATH=$p "$@"; fi
 334 }
 335
 336 ###--------------------------------------------------------------------------
 337 ### Finishing touches.
 338
 339 ## Make sure `$HOME/bin' is on the path.
 340 path_add "$HOME/bin"
 341
 342 ## Set the temporary directory again.  (A setuid or setgid program may have
 343 ## unhelpfully forgotten this for us.)
 344 case ${TMPDIR+t} in
 345   t) ;;
 346   *) if __mdw_programp tmpdir; then eval $(tmpdir -b); fi ;;
 347 esac
 348
 349 ## For `root' use -- some simple molly-guards.
 350 case $(id -u) in
 351   0)
 352     alias rm="rm -i" cp="cp -i" mv="mv -i"
 353     set -o noclobber
 354     ;;
 355 esac
 356
 357 ## Run any local hooks.
 358 __mdw_source_if_exists "$HOME/.shell-local"
 359
 360 ###----- That's all, folks --------------------------------------------------