533 lines
16 KiB
Bash
533 lines
16 KiB
Bash
#!/bin/zsh -f
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emulate -L zsh
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local RUNNING_AS_COMMAND=
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local EXIT=return
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if [[ $(whence -w $0) == *:' 'command ]]; then
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RUNNING_AS_COMMAND=1
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EXIT=exit
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fi
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local DOC='scd -- smart change to a recently used directory
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usage: scd [options] [pattern1 pattern2 ...]
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Go to a directory path that matches all patterns. Prefer recent or
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frequently visited directories as found in the directory index.
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Display a selection menu in case of multiple matches.
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Special patterns:
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^PAT match at the path root, "^/home"
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PAT$ match paths ending with PAT, "man$"
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./ match paths under the current directory
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:PAT require PAT to span the tail, ":doc", ":re/doc"
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Options:
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-a, --add add current or specified directories to the index.
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--unindex remove current or specified directories from the index.
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-r, --recursive apply options --add or --unindex recursively.
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--alias=ALIAS create alias for the current or specified directory and
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store it in ~/.scdalias.zsh.
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--unalias remove ALIAS definition for the current or specified
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directory from ~/.scdalias.zsh.
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Use "OLD" to purge aliases to non-existent directories.
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-A, --all display all directories even those excluded by patterns
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in ~/.scdignore. Disregard unique match for a directory
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alias and filtering of less likely paths.
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-p, --push use "pushd" to change to the target directory.
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--list show matching directories and exit.
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-v, --verbose display directory rank in the selection menu.
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-h, --help display this message and exit.
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'
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local SCD_HISTFILE=${SCD_HISTFILE:-${HOME}/.scdhistory}
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local SCD_HISTSIZE=${SCD_HISTSIZE:-5000}
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local SCD_MENUSIZE=${SCD_MENUSIZE:-20}
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local SCD_MEANLIFE=${SCD_MEANLIFE:-86400}
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local SCD_THRESHOLD=${SCD_THRESHOLD:-0.005}
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local SCD_SCRIPT=${RUNNING_AS_COMMAND:+$SCD_SCRIPT}
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local SCD_ALIAS=~/.scdalias.zsh
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local SCD_IGNORE=~/.scdignore
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# Minimum logarithm of probability. Avoids out of range warning in exp().
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local -r MINLOGPROB=-15
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# When false, use case-insensitive globbing to fix PWD capitalization.
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local PWDCASECORRECT=true
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if [[ ${OSTYPE} == darwin* ]]; then
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PWDCASECORRECT=false
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fi
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local a d m p i maxrank threshold
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local opt_help opt_add opt_unindex opt_recursive opt_verbose
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local opt_alias opt_unalias opt_all opt_push opt_list
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local -A drank dalias scdignore
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local dmatching
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local last_directory
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setopt extendedglob noautonamedirs brace_ccl
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# If SCD_SCRIPT is defined make sure that that file exists and is empty.
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# This removes any old previous commands from the SCD_SCRIPT file.
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[[ -n "$SCD_SCRIPT" ]] && [[ -s $SCD_SCRIPT || ! -f $SCD_SCRIPT ]] && (
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umask 077
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: >| $SCD_SCRIPT
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)
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# process command line options
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zmodload -i zsh/zutil
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zmodload -i zsh/datetime
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zmodload -i zsh/parameter
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zparseopts -D -E -- a=opt_add -add=opt_add -unindex=opt_unindex \
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r=opt_recursive -recursive=opt_recursive \
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-alias:=opt_alias -unalias=opt_unalias \
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A=opt_all -all=opt_all p=opt_push -push=opt_push -list=opt_list \
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v=opt_verbose -verbose=opt_verbose h=opt_help -help=opt_help \
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|| $EXIT $?
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# remove the first instance of "--" from positional arguments
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argv[(i)--]=( )
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if [[ -n $opt_help ]]; then
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print $DOC
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$EXIT
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fi
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# load directory aliases if they exist
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[[ -r $SCD_ALIAS ]] && source $SCD_ALIAS
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# load scd-ignore patterns if available
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if [[ -s $SCD_IGNORE ]]; then
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setopt noglob
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<$SCD_IGNORE \
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while read p; do
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[[ $p != [\#]* ]] || continue
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[[ -n $p ]] || continue
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# expand leading tilde if it has valid expansion
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if [[ $p == [~]* ]] && ( : ${~p} ) 2>/dev/null; then
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p=${~p}
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fi
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scdignore[$p]=1
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done
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setopt glob
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fi
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# Private internal functions are prefixed with _scd_Y19oug_.
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# Clean them up when the scd function returns.
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setopt localtraps
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trap 'unfunction -m "_scd_Y19oug_*"' EXIT
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# works faster than the (:a) modifier and is compatible with zsh 4.2.6
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_scd_Y19oug_abspath() {
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set -A $1 ${(ps:\0:)"$(
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setopt pushdsilent
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unfunction -m "*"
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unalias -m "*"
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unset CDPATH
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shift
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for d; do
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pushd $d || continue
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$PWDCASECORRECT &&
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print -Nr -- $PWD ||
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print -Nr -- (#i)$PWD
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popd 2>/dev/null
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done
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)"}
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}
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# define directory alias
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if [[ -n $opt_alias ]]; then
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if [[ -n $1 && ! -d $1 ]]; then
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print -u2 "'$1' is not a directory."
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$EXIT 1
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fi
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a=${opt_alias[-1]#=}
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_scd_Y19oug_abspath d ${1:-$PWD}
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# alias in the current shell, update alias file if successful
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hash -d -- $a=$d &&
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(
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umask 077
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hash -dr
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[[ -r $SCD_ALIAS ]] && source $SCD_ALIAS
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hash -d -- $a=$d
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hash -dL >| $SCD_ALIAS
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)
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$EXIT $?
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fi
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# undefine one or more directory aliases
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if [[ -n $opt_unalias ]]; then
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local -U uu
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local ec=0
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uu=( ${*:-${PWD}} )
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if (( ${uu[(I)OLD]} && ${+nameddirs[OLD]} == 0 )); then
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uu=( ${uu:#OLD} ${(ps:\0:)"$(
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hash -dr
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if [[ -r $SCD_ALIAS ]]; then
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source $SCD_ALIAS
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fi
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for a d in ${(kv)nameddirs}; do
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[[ -d $d ]] || print -Nr -- $a
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done
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)"}
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)
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fi
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m=( )
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for p in $uu; do
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d=$p
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if [[ ${+nameddirs[$d]} == 0 && -d $d ]]; then
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_scd_Y19oug_abspath d $d
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fi
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a=${(k)nameddirs[$d]:-${(k)nameddirs[(r)$d]}}
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if [[ -z $a ]]; then
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ec=1
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print -u2 "'$p' is neither a directory alias nor an aliased path."
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continue
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fi
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# unalias in the current shell and remember to update the alias file
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if unhash -d -- $a 2>/dev/null; then
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m+=( $a )
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fi
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done
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if [[ $#m != 0 && -r $SCD_ALIAS ]]; then
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(
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umask 077
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hash -dr
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source $SCD_ALIAS
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for a in $m; do
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unhash -d -- $a 2>/dev/null
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done
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hash -dL >| $SCD_ALIAS
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) || ec=$?
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fi
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$EXIT $ec
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fi
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# The "compress" function collapses repeated directories into
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# a single entry with a time-stamp yielding an equivalent probability.
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_scd_Y19oug_compress() {
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awk -v epochseconds=$EPOCHSECONDS \
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-v meanlife=$SCD_MEANLIFE \
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-v minlogprob=$MINLOGPROB \
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'
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BEGIN {
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FS = "[:;]";
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pmin = exp(minlogprob);
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}
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/^: deleted:0;/ { next; }
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length($0) < 4096 && $2 > 1000 {
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df = $0;
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sub("^[^;]*;", "", df);
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if (!df) next;
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tau = 1.0 * ($2 - epochseconds) / meanlife;
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prob = (tau < minlogprob) ? pmin : exp(tau);
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dlist[last[df]] = "";
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dlist[NR] = df;
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last[df] = NR;
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ptot[df] += prob;
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}
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END {
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for (i = 1; i <= NR; ++i) {
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d = dlist[i];
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if (d) {
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ts = log(ptot[d]) * meanlife + epochseconds;
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printf(": %.0f:0;%s\n", ts, d);
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}
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}
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}
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' $*
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}
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# Rewrite directory index if it is at least 20% oversized.
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local curhistsize
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if [[ -z $opt_unindex && -s $SCD_HISTFILE ]] && \
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curhistsize=$(wc -l <$SCD_HISTFILE) && \
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(( $curhistsize > 1.2 * $SCD_HISTSIZE )); then
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# Compress repeated entries in a background process.
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(
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m=( ${(f)"$(_scd_Y19oug_compress $SCD_HISTFILE)"} )
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# purge non-existent and ignored directories
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m=( ${(f)"$(
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for a in $m; do
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d=${a#*;}
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[[ -z ${scdignore[(k)$d]} ]] || continue
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[[ -d $d ]] || continue
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$PWDCASECORRECT || d=( (#i)${d} )
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t=${a%%;*}
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print -r -- "${t};${d}"
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done
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)"}
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)
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# cut old entries if still oversized
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if [[ $#m -gt $SCD_HISTSIZE ]]; then
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m=( ${m[-$SCD_HISTSIZE,-1]} )
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fi
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# Checking existence of many directories could have taken a while.
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# Append any index entries added in meantime.
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m+=( ${(f)"$(sed "1,${curhistsize}d" $SCD_HISTFILE)"} )
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print -lr -- $m >| ${SCD_HISTFILE}
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) &|
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fi
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# Determine the last recorded directory
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if [[ -s ${SCD_HISTFILE} ]]; then
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last_directory=${"$(tail -n 1 ${SCD_HISTFILE})"#*;}
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fi
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# The "record" function adds its arguments to the directory index.
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_scd_Y19oug_record() {
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while [[ -n $last_directory && $1 == $last_directory ]]; do
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shift
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done
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if [[ $# -gt 0 ]]; then
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( umask 077
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p=": ${EPOCHSECONDS}:0;"
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print -lr -- ${p}${^*} >>| $SCD_HISTFILE )
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fi
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}
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if [[ -n $opt_add ]]; then
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m=( ${^${argv:-$PWD}}(N-/) )
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_scd_Y19oug_abspath m ${m}
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_scd_Y19oug_record $m
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if [[ -n $opt_recursive ]]; then
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for d in $m; do
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print -n "scanning ${d} ... "
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_scd_Y19oug_record ${d}/**/*(-/N)
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print "[done]"
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done
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fi
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$EXIT
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fi
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# take care of removing entries from the directory index
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if [[ -n $opt_unindex ]]; then
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if [[ ! -s $SCD_HISTFILE ]]; then
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$EXIT
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fi
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argv=( ${argv:-$PWD} )
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# expand existing directories in the argument list
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for i in {1..$#}; do
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if [[ -d ${argv[i]} ]]; then
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_scd_Y19oug_abspath d ${argv[i]}
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argv[i]=${d}
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fi
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done
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# strip trailing slashes, but preserve the root path
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argv=( ${argv/(#m)?\/##(#e)/${MATCH[1]}} )
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m="$(awk -v recursive=${opt_recursive} '
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BEGIN {
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for (i = 2; i < ARGC; ++i) {
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argset[ARGV[i]] = 1;
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delete ARGV[i];
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}
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unindex_root = ("/" in argset);
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}
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1 {
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d = $0; sub(/^[^;]*;/, "", d);
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if (d in argset) next;
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}
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recursive {
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if (unindex_root) exit;
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for (a in argset) {
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if (substr(d, 1, length(a) + 1) == a"/") next;
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}
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}
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{ print $0 }
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' $SCD_HISTFILE $* )" || $EXIT $?
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: >| ${SCD_HISTFILE}
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[[ ${#m} == 0 ]] || print -r -- $m >> ${SCD_HISTFILE}
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$EXIT
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fi
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# The "action" function is called when there is just one target directory.
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_scd_Y19oug_action() {
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local cdcmd=cd
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[[ -z ${opt_push} ]] || cdcmd=pushd
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builtin $cdcmd $1 || return $?
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if [[ -z $SCD_SCRIPT && -n $RUNNING_AS_COMMAND ]]; then
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print -u2 "Warning: running as command with SCD_SCRIPT undefined."
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fi
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if [[ -n $SCD_SCRIPT ]]; then
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local d=$1
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if [[ $OSTYPE == cygwin && ${(L)SCD_SCRIPT} == *.bat ]]; then
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d=$(cygpath -aw .)
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fi
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print -r "${cdcmd} ${(qqq)d}" >| $SCD_SCRIPT
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fi
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}
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# Select and order indexed directories by matching command-line patterns.
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# Set global arrays dmatching and drank.
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_scd_Y19oug_match() {
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## single argument that is an existing directory or directory alias
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if [[ -z $opt_all && $# == 1 ]] && \
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[[ -d ${d::=${nameddirs[$1]}} || -d ${d::=$1} ]] && [[ -x $d ]];
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then
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_scd_Y19oug_abspath dmatching $d
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drank[${dmatching[1]}]=1
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return
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fi
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# quote brackets when PWD is /Volumes/[C]/
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local qpwd=${PWD//(#m)[][]/\\${MATCH}}
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# support "./" as an alias for $PWD to match only subdirectories.
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argv=( ${argv/(#s).\/(#e)/(#s)${qpwd}(|/*)(#e)} )
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# support "./pat" as an alias for $PWD/pat.
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argv=( ${argv/(#m)(#s).\/?*/(#s)${qpwd}${MATCH#.}} )
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# support "^" as an anchor for the root directory, e.g., "^$HOME".
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argv=( ${argv/(#m)(#s)\^?*/(#s)${${~MATCH[2,-1]}}} )
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# support "$" as an anchor at the end of directory name.
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argv=( ${argv/(#m)?[$](#e)/${MATCH[1]}(#e)} )
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# support prefix ":" to match over the tail component.
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argv=( ${argv/(#m)(#s):?*/${MATCH[2,-1]}[^/]#(#e)} )
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# calculate rank of all directories in SCD_HISTFILE and store it in drank.
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# include a dummy entry to avoid issues with splitting an empty string.
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[[ -s $SCD_HISTFILE ]] && drank=( ${(f)"$(
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print -l /dev/null -10
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<$SCD_HISTFILE \
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awk -v epochseconds=$EPOCHSECONDS \
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-v meanlife=$SCD_MEANLIFE \
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-v minlogprob=$MINLOGPROB \
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'
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BEGIN {
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FS = "[:;]";
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pmin = exp(minlogprob);
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}
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/^: deleted:0;/ {
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df = $0;
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sub("^[^;]*;", "", df);
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delete ptot[df];
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next;
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}
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length($0) < 4096 && $2 > 0 {
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df = $0;
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sub("^[^;]*;", "", df);
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if (!df) next;
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dp = df;
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while (!(dp in ptot)) {
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ptot[dp] = pmin;
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sub("//*[^/]*$", "", dp);
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if (!dp) break;
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}
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if ($2 <= 1000) next;
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tau = 1.0 * ($2 - epochseconds) / meanlife;
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prob = (tau < minlogprob) ? pmin : exp(tau);
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ptot[df] += prob;
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}
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END { for (di in ptot) { print di; print ptot[di]; } }
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'
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)"}
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)
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unset "drank[/dev/null]"
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# filter drank to the entries that match all arguments
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for a; do
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p="(#l)*(${a})*"
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drank=( ${(kv)drank[(I)${~p}]} )
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done
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# require that at least one argument matches in directory tail name.
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p="(#l)*(${(j:|:)argv})[^/]#"
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drank=( ${(kv)drank[(I)${~p}]} )
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# discard ignored directories
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if [[ -z ${opt_all} ]]; then
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for d in ${(k)drank}; do
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[[ -z ${scdignore[(k)$d]} ]] || unset "drank[$d]"
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done
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fi
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# build a list of matching directories reverse-sorted by their probabilities
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dmatching=( ${(f)"$(
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builtin printf "%s %s\n" ${(Oakv)drank} |
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/usr/bin/sort -grk1 )"}
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)
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dmatching=( ${dmatching#*[[:blank:]]} )
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# do not match $HOME or $PWD when run without arguments
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if [[ $# == 0 ]]; then
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dmatching=( ${dmatching:#(${HOME}|${PWD})} )
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fi
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# keep at most SCD_MENUSIZE of matching and valid directories
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# mark up any deleted entries in the index
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local -A isdeleted
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m=( )
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isdeleted=( )
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for d in $dmatching; do
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[[ ${#m} == $SCD_MENUSIZE ]] && break
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(( ${+isdeleted[$d]} == 0 )) || continue
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[[ -d $d ]] || { isdeleted[$d]=1; continue }
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[[ -x $d ]] && m+=$d
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done
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dmatching=( $m )
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if [[ -n ${isdeleted} ]]; then
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print -lr -- ": deleted:0;"${^${(k)isdeleted}} >> $SCD_HISTFILE
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fi
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# find the maximum rank
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maxrank=0.0
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for d in $dmatching; do
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[[ ${drank[$d]} -lt maxrank ]] || maxrank=${drank[$d]}
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done
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# discard all directories below the rank threshold
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threshold=$(( maxrank * SCD_THRESHOLD ))
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if [[ -n ${opt_all} ]]; then
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threshold=0
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fi
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dmatching=( ${^dmatching}(Ne:'(( ${drank[$REPLY]} >= threshold ))':) )
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}
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_scd_Y19oug_match $*
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## process matching directories.
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if [[ ${#dmatching} == 0 ]]; then
|
|
print -u2 "No matching directory."
|
|
$EXIT 1
|
|
fi
|
|
|
|
## build formatted directory aliases for selection menu or list display
|
|
for d in $dmatching; do
|
|
if [[ -n ${opt_verbose} ]]; then
|
|
dalias[$d]=$(printf "%.3g %s" ${drank[$d]} $d)
|
|
else
|
|
dalias[$d]=$(print -Dr -- $d)
|
|
fi
|
|
done
|
|
|
|
## process the --list option
|
|
if [[ -n $opt_list ]]; then
|
|
for d in $dmatching; do
|
|
print -r -- "# ${dalias[$d]}"
|
|
print -r -- $d
|
|
done
|
|
$EXIT
|
|
fi
|
|
|
|
## handle a single matching directory here.
|
|
if [[ ${#dmatching} == 1 ]]; then
|
|
_scd_Y19oug_action $dmatching
|
|
$EXIT $?
|
|
fi
|
|
|
|
## Here we have multiple matches. Let's use the selection menu.
|
|
a=( {a-z} {A-Z} )
|
|
a=( ${a[1,${#dmatching}]} )
|
|
p=( )
|
|
for i in {1..${#dmatching}}; do
|
|
[[ -n ${a[i]} ]] || break
|
|
p+="${a[i]}) ${dalias[${dmatching[i]}]}"
|
|
done
|
|
|
|
print -c -r -- $p
|
|
|
|
if read -s -k 1 d && [[ ${i::=${a[(I)$d]}} -gt 0 ]]; then
|
|
_scd_Y19oug_action ${dmatching[i]}
|
|
$EXIT $?
|
|
fi
|