zsh-autosuggestions/src/async.zsh

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2016-07-20 05:04:18 +02:00
#--------------------------------------------------------------------#
# Async #
#--------------------------------------------------------------------#
_zsh_autosuggest_async_fetch_suggestion() {
# Send the prefix to the pty to fetch a suggestion
zpty -w -n $ZSH_AUTOSUGGEST_PTY_NAME "${1}"$'\0'
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}
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# Pty is spawned running this function
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_zsh_autosuggest_async_suggestion_server() {
emulate -R zsh
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# Output only newlines (not carriage return + newline)
stty -onlcr
local strategy=$1
local last_pid
while IFS='' read -r -d $'\0' prefix; do
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# Kill last bg process
kill -KILL $last_pid &>/dev/null
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# Run suggestion search in the background
(echo -n -E "$($strategy "$prefix")"$'\0') &
last_pid=$!
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done
}
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# Called when new data is ready to be read from the pty
# First arg will be fd ready for reading
# Second arg will be passed in case of error
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_zsh_autosuggest_async_suggestion_ready() {
local suggestion
zpty -rt $ZSH_AUTOSUGGEST_PTY_NAME suggestion '*'$'\0' 2>/dev/null
zle _autosuggest-show-suggestion "${suggestion%$'\0'}"
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}
# Recreate the pty to get a fresh list of history events
_zsh_autosuggest_async_recreate_pty() {
typeset -g _ZSH_AUTOSUGGEST_PTY_FD
# Kill the old pty
if [ -n "$_ZSH_AUTOSUGGEST_PTY_FD" ]; then
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# Remove the input handler
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zle -F $_ZSH_AUTOSUGGEST_PTY_FD
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# Destroy the pty
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zpty -d $ZSH_AUTOSUGGEST_PTY_NAME &>/dev/null
fi
# With newer versions of zsh, REPLY stores the fd to read from
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typeset -h REPLY
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# If we won't get a fd back from zpty, try to guess it
if [ $_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD -eq 0 ]; then
integer -l zptyfd
exec {zptyfd}>&1 # Open a new file descriptor (above 10).
exec {zptyfd}>&- # Close it so it's free to be used by zpty.
fi
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# Start a new pty running the server function
zpty -b $ZSH_AUTOSUGGEST_PTY_NAME "_zsh_autosuggest_async_suggestion_server _zsh_autosuggest_strategy_$ZSH_AUTOSUGGEST_STRATEGY"
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# Store the fd so we can destroy this pty later
if (( REPLY )); then
_ZSH_AUTOSUGGEST_PTY_FD=$REPLY
else
_ZSH_AUTOSUGGEST_PTY_FD=$zptyfd
fi
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# Set up input handler from the pty
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zle -F $_ZSH_AUTOSUGGEST_PTY_FD _zsh_autosuggest_async_suggestion_ready
}