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