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Add Z, a cd tracker

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1 parent b3cb228 commit 46e9425e49e49fa6bd05dfebb055ca20abd3da64 @robmiller committed Sep 1, 2012
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209 z.sh
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+# Copyright (c) 2009 rupa deadwyler under the WTFPL license
+
+# maintains a jump-list of the directories you actually use
+#
+# INSTALL:
+# * put something like this in your .bashrc/.zshrc:
+# . /path/to/z.sh
+# * cd around for a while to build up the db
+# * PROFIT!!
+# * 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).
+# set $_Z_NO_RESOLVE_SYMLINKS to prevent symlink resolution.
+# set $_Z_NO_PROMPT_COMMAND if you're handling PROMPT_COMMAND yourself.
+#
+# USE:
+# * z foo # cd to most frecent dir matching foo
+# * z foo bar # cd to most frecent dir matching foo and bar
+# * z -r foo # cd to highest ranked dir matching foo
+# * z -t foo # cd to most recently accessed dir matching foo
+# * z -l foo # list all dirs matching foo (by frecency)
+
+_z() {
+
+ local datafile="${_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 $datafile.XXXXXX)" || return
+ while read line; do
+ [ -d "${line%%\|*}" ] && echo $line
+ done < "$datafile" | awk -v path="$*" -v now="$(date +%s)" -F"|" '
+ BEGIN {
+ rank[path] = 1
+ time[path] = now
+ }
+ $2 >= 1 {
+ if( $1 == path ) {
+ rank[$1] = $2 + 1
+ time[$1] = now
+ } else {
+ rank[$1] = $2
+ time[$1] = $3
+ }
+ count += $2
+ }
+ END {
+ if( count > 1000 ) {
+ for( i in rank ) print i "|" 0.9*rank[i] "|" time[i] # aging
+ } else for( i in rank ) print i "|" rank[i] "|" time[i]
+ }
+ ' 2>/dev/null >| "$tempfile"
+ if [ $? -ne 0 -a -f "$datafile" ]; then
+ env rm -f "$tempfile"
+ else
+ env mv -f "$tempfile" "$datafile"
+ fi
+
+ # tab completion
+ elif [ "$1" = "--complete" ]; then
+ while read line; do
+ [ -d "${line%%\|*}" ] && echo $line
+ done < "$datafile" | awk -v q="$2" -F"|" '
+ BEGIN {
+ if( q == tolower(q) ) nocase = 1
+ split(substr(q,3),fnd," ")
+ }
+ {
+ 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
+ }
+ ' 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 "$datafile" ] || return
+
+ local cd
+ cd="$(while read line; do
+ [ -d "${line%%\|*}" ] && echo $line
+ done < "$datafile" | awk -v t="$(date +%s)" -v list="$list" -v typ="$typ" -v q="$fnd" -F"|" '
+ 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
+ # shortest match must be common to each match. escape special characters in
+ # a copy when testing, so we can return the original.
+ clean_short = short
+ gsub(/[\(\)\[\]\|]/, "\\\\&", clean_short)
+ for( i in matches ) if( matches[i] && i !~ clean_short ) return
+ return short
+ }
+ BEGIN { split(q, a, " ") }
+ {
+ 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))
+ }
+ ')"
+ [ $? -gt 0 ] && return
+ [ "$cd" ] && cd "$cd"
+ fi
+}
+
+alias ${_Z_CMD:-z}='_z 2>&1'
+
+[ "$_Z_NO_RESOLVE_SYMLINKS" ] || _Z_RESOLVE_SYMLINKS="-P"
+
+if complete &> /dev/null; then
+ # bash tab completion
+ complete -o filenames -C '_z --complete "$COMP_LINE"' ${_Z_CMD:-z}
+ [ "$_Z_NO_PROMPT_COMMAND" ] || {
+ # populate directory list. avoid clobbering other PROMPT_COMMANDs.
+ echo $PROMPT_COMMAND | grep -q "_z --add"
+ [ $? -gt 0 ] && PROMPT_COMMAND='_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'"$PROMPT_COMMAND"
+ }
+elif compctl &> /dev/null; then
+ [ "$_Z_NO_PROMPT_COMMAND" ] || {
+ # populate directory list, avoid clobbering any other precmds
+ if [ "$_Z_NO_RESOLVE_SYMLINKS" ]; then
+ _z_precmd() {
+ _z --add "${PWD:a}"
+ }
+ else
+ _z_precmd() {
+ _z --add "${PWD:A}"
+ }
+ fi
+ precmd_functions+=(_z_precmd)
+ }
+ # 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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