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# maintains a jump-list of the directories you actually use
# old directories eventually fall off the list
# inspired by Joel Schaerer's http://wiki.github.com/joelthelion/autojump
# and something similar i had - but i could never get the dir list right.
#
# INSTALL:
# source into .bashrc under your '[-z "$PS1" ] || return' line
# cd around for a while
#
# USE:
# j [--h[elp]] [--l] [--r] [--s] [regex1 ... regexn]
# with no args, returns full list (same as j --l)
# regex1 ... regexn jump to the the weighted directory matching all masks
# --l show the list instead of jumping
# --r order by recently used instead of most used.
# --s shortest matching path
#
# TIPS:
# Some handy aliases:
# alias jl='j --l'
# alias jr='j --r'
# alias js='j --s'
#
# CREDITS:
# Joel Schaerer aka joelthelion for autojump
# Daniel Drucker aka dmd for finding bugs and making me late for lunch
j() {
 # change jfile if you already have a .j file for something else
 local jfile=$HOME/.j
 [ "$1" = "--add" ] && {
  shift
  # we're in $HOME all the time, let something else get all the good letters
  [ "$*" = "$HOME" ] && return
  awk -v q="$*" -v t="$(date +%s)" -F"|" '
$2 >= 1 {
if( $1 == q ) {
l[$1] = $2 + 1
d[$1] = t
found = 1
} else {
l[$1] = $2
d[$1] = $3
count += $2
}
}
END {
if( !found ) l[q] = 1 && d[q] = t
if( count > 1000 ) {
for( i in l ) print i "|" 0.9*l[i] "|" d[i] # aging
} else for( i in l ) print i "|" l[i] "|" d[i]
}
' $jfile 2>/dev/null > $jfile.tmp
  mv -f $jfile.tmp $jfile
  return
 }
 # for tab completion
 [ "$1" = "--complete" ] && {
  awk -v q="$2" -F"|" '
BEGIN { split(substr(q,3),a," ") }
{
if( system("test -d \"" $1 "\"") ) next
for( i in a ) $1 !~ a[i] && $1 = ""; if( $1 ) print $1
}
' $jfile 2>/dev/null
  return
 }
 if [ $1 ]; then
  local x; local out
  for x do case $x in
   --h*) echo "j [--h[elp]] [--l] [--r] [--s] [regex1 ... regexn]"; return;;
   --l)local list=1;;
   --r)local recent=r;;
   --s)local short=1;;
     *)local out="$out $x";;
  esac; shift; done
  set -- $out
 else
  local list=1
 fi
 # remove directories that no longer exist
 awk -F"|" '
{ if( system("test -d \"" $1 "\"") ) next; print $0 }
' $jfile 2>/dev/null > $jfile.tmp
 mv -f $jfile.tmp $jfile
 if [ $list ]; then
  [ "$short" ] && return
  awk -v q="$*" -v t="$(date +%s)" -v r="$recent" -F"|" '
BEGIN { f = 2; split(q,a," "); if( r ) f = 3 }
{
if( system("test -d \"" $1 "\"") ) next
for( i in a ) $1 !~ a[i] && $1 = ""
if( $1 ) if( f == 3 ) { print t - $f "\t" $1 } else print $f "\t" $1
}
' $jfile 2>/dev/null | sort -n$recent
 # if we hit enter on a completion just go there
 elif [ -d "/${out#*/}" ]; then
  cd "/${out#*/}"
 # prefer case sensitive
 else
  out=$(awk -v q="$*" -v s="$short" -v r="$recent" -F"|" '
BEGIN { split(q,a," "); if( r ) { f = 3 } else f = 2 }
{
if( system("test -d \"" $1 "\"") ) next
for( i in a ) $1 !~ a[i] && $1 = ""
if( $1 ) {
if( s ) {
if( length($1) <= length(x) ) {
x = $1
} else if( ! x ) x = $1
} else if( $f >= dx ) { x = $1; dx = $f }
}
}
END {
if( ! x ) {
close(FILENAME)
while( getline < FILENAME ) {
if( system("test -d \"" $1 "\"") ) continue
for( i in a ) tolower($1) !~ tolower(a[i]) && $1 = ""
if( $1 ) {
if( s ) {
if( length($1) <= length(x) ) {
x = $1
} else if( ! x ) x = $1
} else if( $f >= dx ) { x = $1; dx = $f }
}
}
}
if( x ) print x
}
' $jfile)
  [ "$out" ] && cd "$out"
 fi
}
# tab completion for j
complete -C 'j --complete "$COMP_LINE"' j
# populate directory list. avoid clobbering other PROMPT_COMMANDs.
PROMPT_COMMAND='j --add "$(pwd -P)";'"$PROMPT_COMMAND"
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