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# This set of functions implements a sort of magic history searching.
# After predict-on, typing characters causes the editor to look backward
# in the history for the first line beginning with what you have typed so
# far. After predict-off, editing returns to normal for the line found.
# In fact, you often don't even need to use predict-off, because if the
# line doesn't match something in the history, adding a key performs
# standard completion --- though editing in the middle is liable to delete
# the rest of the line.
#
# With the function based completion system (which is needed for this),
# you should be able to type TAB at almost any point to advance the cursor
# to the next "interesting" character position (usually the end of the
# current word, but sometimes somewhere in the middle of the word). And
# of course as soon as the entire line is what you want, you can accept
# with RETURN, without needing to move the cursor to the end first.
#
# To use it:
# autoload -U predict-on
# zle -N predict-on
# zle -N predict-off
# bindkey '...' predict-on
# bindkey '...' predict-off
# Note that all functions are defined when you first type the predict-on
# key, which means typing the predict-off key before that gives a harmless
# error message.
predict-on() {
zle -N self-insert insert-and-predict
zle -N magic-space insert-and-predict
zle -N backward-delete-char delete-backward-and-predict
zle -N delete-char-or-list delete-no-predict
zstyle -t :predict verbose && zle -M predict-on
return 0
}
predict-off() {
zle -A .self-insert self-insert
zle -A .magic-space magic-space
zle -A .backward-delete-char backward-delete-char
zstyle -t :predict verbose && zle -M predict-off
return 0
}
insert-and-predict () {
setopt localoptions noshwordsplit noksharrays
if [[ $LBUFFER == *$'\012'* ]] || (( PENDING ))
then
# Editing a multiline buffer or pasting in a chunk of text;
# it's unlikely prediction is wanted
zstyle -t ":predict" toggle && predict-off
zle .$WIDGET "$@"
return
elif [[ ${RBUFFER[1]} == ${KEYS[-1]} ]]
then
# Same as what's typed, just move on
((++CURSOR))
else
LBUFFER="$LBUFFER$KEYS"
if [[ $LASTWIDGET == (self-insert|magic-space|backward-delete-char) ||
$LASTWIDGET == (complete-word|accept-*|predict-*) ]]
then
if ! zle .history-beginning-search-backward
then
RBUFFER=""
if [[ ${KEYS[-1]} != ' ' ]]
then
unsetopt automenu recexact
integer curs=$CURSOR pos nchar=${#LBUFFER//[^${KEYS[-1]}]}
local -a +h comppostfuncs
local crs curcontext="predict:${${curcontext:-:::}#*:}"
comppostfuncs=( predict-limit-list )
zle complete-word
# Decide where to leave the cursor. The dummy loop is used to
# get out of that `case'.
repeat 1
do
zstyle -s ":predict" cursor crs
case $crs in
(complete)
# At the place where the completion left it, if it is after
# the character typed.
[[ ${LBUFFER[-1]} = ${KEYS[-1]} ]] && break
;&
(key)
# Or maybe at the n'th occurrence of the character typed.
pos=${BUFFER[(in:nchar:)${KEYS[-1]}]}
if [[ pos -gt curs ]]
then
CURSOR=$pos
break
fi
;&
(*)
# Or else at the previous position.
CURSOR=$curs
esac
done
fi
fi
else
zstyle -t ":predict" toggle && predict-off
fi
fi
return 0
}
delete-backward-and-predict() {
if (( $#LBUFFER > 1 ))
then
setopt localoptions noshwordsplit noksharrays
# When editing a multiline buffer, it's unlikely prediction is wanted;
# or if the last widget was e.g. a motion, then probably the intent is
# to actually edit the line, not change the search prefix.
if [[ $LBUFFER = *$'\012'* ||
$LASTWIDGET != (self-insert|magic-space|backward-delete-char) ]]
then
zstyle -t ":predict" toggle && predict-off
LBUFFER="$LBUFFER[1,-2]"
else
((--CURSOR))
zle .history-beginning-search-forward || RBUFFER=""
return 0
fi
fi
}
delete-no-predict() {
[[ $WIDGET != delete-char-or-list || -n $RBUFFER ]] && predict-off
zle .$WIDGET "$@"
}
# This is a helper function for autocompletion to prevent long lists
# of matches from forcing a "do you wish to see all ...?" prompt.
predict-limit-list() {
if (( compstate[list_lines]+BUFFERLINES > LINES ||
( compstate[list_max] != 0 &&
compstate[nmatches] > compstate[list_max] ) ))
then
compstate[list]=''
elif zstyle -t ":predict" list always
then
compstate[list]='force list'
fi
}
# Handle zsh autoloading conventions
[[ -o kshautoload ]] || predict-on "$@"
|
