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# Copyright (c) 2009 rupa deadwyler under the WTFPL license
# maintains a jump-list of the directories you actually use
#
# INSTALL:
# * optionally:
# set $_Z_CMD in .bashrc/.zshrc to change the command (default z).
# set $_Z_DATA in .bashrc/.zshrc to change the datafile (default ~/.z).
# * put something like this in your .bashrc:
# . /path/to/z.sh
# * put something like this in your .zshrc:
# . /path/to/z.sh
# function precmd () {
# _z --add "$(pwd -P)"
# }
# * cd around for a while to build up the db
# * PROFIT!!
#
# USE:
# * z foo # cd to most frecent dir matching foo
# * z foo bar # cd to most frecent dir matching foo and bar
# * z -r foo # cd to highest ranked dir matching foo
# * z -t foo # cd to most recently accessed dir matching foo
# * z -l foo # list all dirs matching foo (by frecency)
_z() {
local datafile="${_Z_DATA:-$HOME/.z}"
# bail out if we don't own ~/.z (we're another user but our ENV is still set)
[ -f "$datafile" -a ! -O "$datafile" ] && return
# add entries
if [ "$1" = "--add" ]; then
shift
# $HOME isn't worth matching
[ "$*" = "$HOME" ] && return
# maintain the file
local tempfile
tempfile="$(mktemp $datafile.XXXXXX)" || return
awk -v path="$*" -v now="$(date +%s)" -v datafile="$datafile" -F"|" '
function notdir(path, tmp) {
# faster than system()
n = gsub("/+", "/", path)
for( i = 0; i < n; i++ ) path = path "/.."
path = path datafile
if( ( getline tmp < path ) >= 0 ) {
close(path)
return 0
}
return 1
}
BEGIN {
rank[path] = 1
time[path] = now
}
$2 >= 1 {
if( notdir($1) ) next
if( $1 == path ) {
rank[$1] = $2 + 1
time[$1] = now
} else {
rank[$1] = $2
time[$1] = $3
}
count += $2
}
END {
if( count > 1000 ) {
for( i in rank ) print i "|" 0.9*rank[i] "|" time[i] # aging
} else for( i in rank ) print i "|" rank[i] "|" time[i]
}
' "$datafile" 2>/dev/null >| "$tempfile"
if [ $? -ne 0 -a -f "$datafile" ]; then
env rm -f "$tempfile"
else
env mv -f "$tempfile" "$datafile"
fi
# tab completion
elif [ "$1" = "--complete" ]; then
awk -v q="$2" -v datafile="$datafile" -F"|" '
function notdir(path, tmp) {
# faster than system()
n = gsub("/+", "/", path)
for( i = 0; i < n; i++ ) path = path "/.."
path = path datafile
if( ( getline tmp < path ) >= 0 ) {
close(path)
return 0
}
return 1
}
BEGIN {
if( q == tolower(q) ) nocase = 1
split(substr(q,3),fnd," ")
}
{
if( notdir($1) ) next
if( nocase ) {
for( i in fnd ) tolower($1) !~ tolower(fnd[i]) && $1 = ""
} else {
for( i in fnd ) $1 !~ fnd[i] && $1 = ""
}
if( $1 ) print $1
}
' "$datafile" 2>/dev/null
else
# list/go
while [ "$1" ]; do case "$1" in
-h) echo "z [-h][-l][-r][-t] args" >&2; return;;
-l) local list=1;;
-r) local typ="rank";;
-t) local typ="recent";;
--) while [ "$1" ]; do shift; local fnd="$fnd $1";done;;
*) local fnd="$fnd $1";;
esac; local last=$1; shift; done
[ "$fnd" ] || local list=1
# if we hit enter on a completion just go there
case "$last" in
# completions will always start with /
/*) [ -z "$list" -a -d "$last" ] && cd "$last" && return;;
esac
# no file yet
[ -f "$datafile" ] || return
local cd
cd="$(awk -v t="$(date +%s)" -v list="$list" -v typ="$typ" -v q="$fnd" -v datafile="$datafile" -F"|" '
function notdir(path, tmp) {
n = gsub("/+", "/", path)
for( i = 0; i < n; i++ ) path = path "/.."
path = path datafile
if( ( getline tmp < path ) >= 0 ) {
close(path)
return 0
}
return 1
}
function frecent(rank, time) {
dx = t-time
if( dx < 3600 ) return rank*4
if( dx < 86400 ) return rank*2
if( dx < 604800 ) return rank/2
return rank/4
}
function output(files, toopen, override) {
if( list ) {
if( typ == "recent" ) {
cmd = "sort -nr >&2"
} else cmd = "sort -n >&2"
for( i in files ) if( files[i] ) printf "%-10s %s\n", files[i], i | cmd
if( override ) printf "%-10s %s\n", "common:", override > "/dev/stderr"
} else {
if( override ) toopen = override
print toopen
}
}
function common(matches) {
# shortest match
for( i in matches ) {
if( matches[i] && (!short || length(i) < length(short)) ) short = i
}
if( short == "/" ) return
# escape regex chars in right hand side
#gsub(/[\(\[\|]/, "\\\&", short)
# shortest match must be common to each match
for( i in matches ) if( matches[i] && i !~ short ) return
return short
}
BEGIN { split(q, a, " ") }
{
if( notdir($1) ) next
if( typ == "rank" ) {
f = $2
} else if( typ == "recent" ) {
f = t-$3
} else f = frecent($2, $3)
wcase[$1] = nocase[$1] = f
for( i in a ) {
if( $1 !~ a[i] ) delete wcase[$1]
if( tolower($1) !~ tolower(a[i]) ) delete nocase[$1]
}
if( wcase[$1] > oldf ) {
cx = $1
oldf = wcase[$1]
} else if( nocase[$1] > noldf ) {
ncx = $1
noldf = nocase[$1]
}
}
END {
if( cx ) {
output(wcase, cx, common(wcase))
} else if( ncx ) output(nocase, ncx, common(nocase))
}
' "$datafile")"
[ $? -gt 0 ] && return
[ "$cd" ] && cd "$cd"
fi
}
alias ${_Z_CMD:-z}='_z 2>&1'
if complete &> /dev/null; then
# bash tab completion
complete -C '_z --complete "$COMP_LINE"' ${_Z_CMD:-z}
# populate directory list. avoid clobbering other PROMPT_COMMANDs.
echo $PROMPT_COMMAND | grep -q "_z --add"
[ $? -gt 0 ] && PROMPT_COMMAND='_z --add "$(pwd -P 2>/dev/null)" 2>/dev/null;'"$PROMPT_COMMAND"
elif compctl &> /dev/null; then
# zsh tab completion
_z_zsh_tab_completion() {
local compl
read -l compl
reply=(${(f)"$(_z --complete "$compl")"})
}
compctl -U -K _z_zsh_tab_completion _z
fi
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