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ohmyzsh plugin of the z project: https://github.com/rupa/z

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Marko Bauhardt 2013-04-03 20:20:57 +02:00
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readme:
@groff -man -Tascii z.1 | col -bx
.PHONY: readme

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Z(1) User Commands Z(1)
NAME
z - jump around
SYNOPSIS
z [-chlrt] [regex1 regex2 ... regexn]
AVAILABILITY
bash, zsh
DESCRIPTION
Tracks your most used directories, based on 'frecency'.
After a short learning phase, z will take you to the most 'frecent'
directory that matches ALL of the regexes given on the command line.
OPTIONS
-c restrict matches to subdirectories of the current directory.
-h show a brief help message
-l list only
-r match by rank only
-t match by recent access only
EXAMPLES
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)
NOTES
Installation:
Put something like this in your $HOME/.bashrc or $HOME/.zshrc:
. /path/to/z.sh
cd around for a while to build up the db.
PROFIT!!
Optionally:
Set $_Z_CMD to change the command name (default z).
Set $_Z_DATA to change the datafile (default $HOME/.z).
Set $_Z_NO_RESOLVE_SYMLINKS to prevent symlink resolution.
Set $_Z_NO_PROMPT_COMMAND to handle PROMPT_COMMAND/precmd your-
self.
Set $_Z_EXCLUDE_DIRS to an array of directories to exclude.
(These settings should go in .bashrc/.zshrc before the lines
added above.)
Install the provided man page z.1 somewhere like
/usr/local/man/man1.
Aging:
The rank of directories maintained by z undergoes aging based on a sim-
ple formula. The rank of each entry is incremented every time it is
accessed. When the sum of ranks is greater than 6000, all ranks are
multiplied by 0.99. Entries with a rank lower than 1 are forgotten.
Frecency:
Frecency is a portmantaeu of 'recent' and 'frequency'. It is a weighted
rank that depends on how often and how recently something occured. As
far as I know, Mozilla came up with the term.
To z, a directory that has low ranking but has been accessed recently
will quickly have higher rank than a directory accessed frequently a
long time ago.
Frecency is determined at runtime.
Common:
When multiple directories match all queries, and they all have a common
prefix, z will cd to the shortest matching directory, without regard to
priority. This has been in effect, if undocumented, for quite some
time, but should probably be configurable or reconsidered.
Tab Completion:
z supports tab completion. After any number of arguments, press TAB to
complete on directories that match each argument. Due to limitations of
the completion implementations, only the last argument will be com-
pleted in the shell.
Internally, z decides you've requested a completion if the last argu-
ment passed is an absolute path to an existing directory. This may
cause unexpected behavior if the last argument to z begins with /.
ENVIRONMENT
A function _z() is defined.
The contents of the variable $_Z_CMD is aliased to _z 2>&1. If not set,
$_Z_CMD defaults to z.
The environment variable $_Z_DATA can be used to control the datafile
location. If it is not defined, the location defaults to $HOME/.z.
The environment variable $_Z_NO_RESOLVE_SYMLINKS can be set to prevent
resolving of symlinks. If it is not set, symbolic links will be
resolved when added to the datafile.
In bash, z prepends a command to the PROMPT_COMMAND environment vari-
able to maintain its database. In zsh, z appends a function _z_precmd
to the precmd_functions array.
The environment variable $_Z_NO_PROMPT_COMMAND can be set if you want
to handle PROMPT_COMMAND or precmd yourself.
The environment variable $_Z_EXCLUDE_DIRS can be set to an array of
directories to exclude from tracking. $HOME is always excluded. Direc-
tories must be full paths without trailing slashes.
FILES
Data is stored in $HOME/.z. This can be overridden by setting the
$_Z_DATA environment variable. When initialized, z will raise an error
if this path is a directory, and not function correctly.
A man page (z.1) is provided.
SEE ALSO
regex(7), pushd, popd, autojump, cdargs
Please file bugs at https://github.com/rupa/z/
z January 2013 Z(1)

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.TH "Z" "1" "January 2013" "z" "User Commands"
.SH
NAME
z \- jump around
.SH
SYNOPSIS
z [\-chlrt] [regex1 regex2 ... regexn]
.SH
AVAILABILITY
bash, zsh
.SH
DESCRIPTION
Tracks your most used directories, based on 'frecency'.
.P
After a short learning phase, \fBz\fR will take you to the most 'frecent'
directory that matches ALL of the regexes given on the command line.
.SH
OPTIONS
.TP
\fB\-c\fR
restrict matches to subdirectories of the current directory.
.TP
\fB\-h\fR
show a brief help message
.TP
\fB\-l\fR
list only
.TP
\fB\-r\fR
match by rank only
.TP
\fB\-t\fR
match by recent access only
.SH EXAMPLES
.TP 14
\fBz foo\fR
cd to most frecent dir matching foo
.TP 14
\fBz foo bar\fR
cd to most frecent dir matching foo and bar
.TP 14
\fBz -r foo\fR
cd to highest ranked dir matching foo
.TP 14
\fBz -t foo\fR
cd to most recently accessed dir matching foo
.TP 14
\fBz -l foo\fR
list all dirs matching foo (by frecency)
.SH
NOTES
.SS
Installation:
.P
Put something like this in your \fB$HOME/.bashrc\fR or \fB$HOME/.zshrc\fR:
.RS
.P
\fB. /path/to/z.sh\fR
.RE
.P
\fBcd\fR around for a while to build up the db.
.P
PROFIT!!
.P
Optionally:
.RS
Set \fB$_Z_CMD\fR to change the command name (default \fBz\fR).
.RE
.RS
Set \fB$_Z_DATA\fR to change the datafile (default \fB$HOME/.z\fR).
.RE
.RS
Set \fB$_Z_NO_RESOLVE_SYMLINKS\fR to prevent symlink resolution.
.RE
.RS
Set \fB$_Z_NO_PROMPT_COMMAND\fR to handle \fBPROMPT_COMMAND/precmd\fR yourself.
.RE
.RS
Set \fB$_Z_EXCLUDE_DIRS\fR to an array of directories to exclude.
.RE
.RS
(These settings should go in .bashrc/.zshrc before the lines added above.)
.RE
.RS
Install the provided man page \fBz.1\fR somewhere like \fB/usr/local/man/man1\fR.
.RE
.SS
Aging:
The rank of directories maintained by \fBz\fR undergoes aging based on a simple
formula. The rank of each entry is incremented every time it is accessed. When
the sum of ranks is greater than 6000, all ranks are multiplied by 0.99. Entries
with a rank lower than 1 are forgotten.
.SS
Frecency:
Frecency is a portmantaeu of 'recent' and 'frequency'. It is a weighted rank
that depends on how often and how recently something occured. As far as I
know, Mozilla came up with the term.
.P
To \fBz\fR, a directory that has low ranking but has been accessed recently
will quickly have higher rank than a directory accessed frequently a long time
ago.
.P
Frecency is determined at runtime.
.SS
Common:
When multiple directories match all queries, and they all have a common prefix,
\fBz\fR will cd to the shortest matching directory, without regard to priority.
This has been in effect, if undocumented, for quite some time, but should
probably be configurable or reconsidered.
.SS
Tab Completion:
\fBz\fR supports tab completion. After any number of arguments, press TAB to
complete on directories that match each argument. Due to limitations of the
completion implementations, only the last argument will be completed in the
shell.
.P
Internally, \fBz\fR decides you've requested a completion if the last argument
passed is an absolute path to an existing directory. This may cause unexpected
behavior if the last argument to \fBz\fR begins with \fB/\fR.
.SH
ENVIRONMENT
A function \fB_z()\fR is defined.
.P
The contents of the variable \fB$_Z_CMD\fR is aliased to \fB_z 2>&1\fR. If not
set, \fB$_Z_CMD\fR defaults to \fBz\fR.
.P
The environment variable \fB$_Z_DATA\fR can be used to control the datafile
location. If it is not defined, the location defaults to \fB$HOME/.z\fR.
.P
The environment variable \fB$_Z_NO_RESOLVE_SYMLINKS\fR can be set to prevent
resolving of symlinks. If it is not set, symbolic links will be resolved when
added to the datafile.
.P
In bash, \fBz\fR prepends a command to the \fBPROMPT_COMMAND\fR environment
variable to maintain its database. In zsh, \fBz\fR appends a function
\fB_z_precmd\fR to the \fBprecmd_functions\fR array.
.P
The environment variable \fB$_Z_NO_PROMPT_COMMAND\fR can be set if you want to
handle \fBPROMPT_COMMAND\fR or \fBprecmd\fR yourself.
.P
The environment variable \fB$_Z_EXCLUDE_DIRS\fR can be set to an array of
directories to exclude from tracking. \fB$HOME\fR is always excluded.
Directories must be full paths without trailing slashes.
.SH
FILES
Data is stored in \fB$HOME/.z\fR. This can be overridden by setting the
\fB$_Z_DATA\fR environment variable. When initialized, \fBz\fR will raise an
error if this path is a directory, and not function correctly.
.P
A man page (\fBz.1\fR) is provided.
.SH
SEE ALSO
regex(7), pushd, popd, autojump, cdargs
.P
Please file bugs at https://github.com/rupa/z/

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_load_z() {
source $1/z.sh
}
[[ -f $ZSH_CUSTOM/plugins/z/z.plugin.zsh ]] && _load_z $ZSH_CUSTOM/plugins/z
[[ -f $ZSH/plugins/z/z.plugin.zsh ]] && _load_z $ZSH/plugins/z

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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.
# set $_Z_EXCLUDE_DIRS to an array of directories to exclude.
#
# 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 matches instead of cd
# * z -c foo # restrict matches to subdirs of $PWD
case $- in
*i*) ;;
*) echo 'ERROR: z.sh is meant to be sourced, not directly executed.'
esac
[ -d "${_Z_DATA:-$HOME/.z}" ] && {
echo "ERROR: z.sh's datafile (${_Z_DATA:-$HOME/.z}) is a directory."
}
_z() {
local datafile="${_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
# $HOME isn't worth matching
[ "$*" = "$HOME" ] && return
# don't track excluded dirs
local exclude
for exclude in "${_Z_EXCLUDE_DIRS[@]}"; do
[ "$*" = "$exclude" ] && return
done
# 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 += $2
}
END {
if( count > 6000 ) {
for( i in rank ) print i "|" 0.99*rank[i] "|" time[i] # aging
} else for( i in rank ) print i "|" rank[i] "|" time[i]
}
' 2>/dev/null >| "$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
--) while [ "$1" ]; do shift; local fnd="$fnd $1";done;;
-*) local opt=${1:1}; while [ "$opt" ]; do case ${opt:0:1} in
c) local fnd="^$PWD $fnd";;
h) echo "${_Z_CMD:-z} [-chlrt] args" >&2; return;;
l) local list=1;;
r) local typ="rank";;
t) local typ="recent";;
esac; opt=${opt:1}; done;;
*) local fnd="$fnd $1";;
esac; local last=$1; shift; done
[ "$fnd" -a "$fnd" != "^$PWD " ] || 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 ) {
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, " "); oldf = noldf = -9999999999 }
{
if( typ == "rank" ) {
f = $2
} else if( typ == "recent" ) {
f = $3-t
} 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] && wcase[$1] > oldf ) {
cx = $1
oldf = wcase[$1]
} else if( nocase[$1] && 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 compctl &> /dev/null; then
[ "$_Z_NO_PROMPT_COMMAND" ] || {
# zsh populate directory list, avoid clobbering any other precmds
if [ "$_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 "$compl")"})
}
compctl -U -K _z_zsh_tab_completion _z
elif complete &> /dev/null; then
# bash tab completion
complete -o filenames -C '_z --complete "$COMP_LINE"' ${_Z_CMD:-z}
[ "$_Z_NO_PROMPT_COMMAND" ] || {
# bash populate directory list. avoid clobbering other PROMPT_COMMANDs.
echo $PROMPT_COMMAND | grep -q "_z --add" || {
PROMPT_COMMAND='_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'"$PROMPT_COMMAND"
}
}
fi