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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.
#
# The setting of compmatchers means that if you use the completion system,
# 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
}
predict-off() {
zle -A .self-insert self-insert
zle -A .magic-space magic-space
zle -A .backward-delete-char backward-delete-char
}
insert-and-predict () {
emulate -L zsh
if [[ ${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) ]]
then
if ! zle .history-beginning-search-backward
then
RBUFFER=""
if [[ ${KEYS[-1]} != ' ' ]]
then
integer curs=$CURSOR
local -a +h comppostfuncs
comppostfuncs=( predict-limit-list )
zle complete-word
CURSOR=$curs
fi
fi
fi
fi
return 0
}
delete-backward-and-predict() {
emulate -L zsh
if [[ -n "$LBUFFER" ]]
then
# 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 [[ $LASTWIDGET == (self-insert|magic-space|backward-delete-char) ]]
then
((--CURSOR))
zle .history-beginning-search-forward || RBUFFER=""
return 0
else
# Depending on preference, you might call "predict-off" here.
LBUFFER="$LBUFFER[1,-2]"
fi
fi
}
delete-no-predict() {
[[ $WIDGET != delete-char-or-list || -n $RBUFFER ]] && predict-off
zle .$WIDGET "$@"
}
# This is a helper function for autocompletion to prevent long lists
# of matches from forcing a "do you wish to see all ...?" prompt.
predict-limit-list() {
if [[ compstate[list_lines]+BUFFERLINES -gt LINES ]]; then
compstate[list]=''
compstate[force_list]=yes
fi
}
# Handle zsh autoloading conventions
[[ -o kshautoload ]] || predict-on "$@"
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