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annotate .zfun/zsh-autosuggestions/src/async.zsh @ 513:ad9ca178e094

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hg: add crevert alias for curses-revert
author Augie Fackler <raf@durin42.com>
date Thu, 03 Jun 2021 14:25:21 -0400
parents e1ce8897030d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
467
e1ce8897030d zsh: import df6f6f9ff41 of zsh-autosuggestions
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1
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2 #--------------------------------------------------------------------#
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3 # Async #
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4 #--------------------------------------------------------------------#
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5
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6 # Zpty process is spawned running this function
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7 _zsh_autosuggest_async_server() {
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8 emulate -R zsh
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9
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10 # There is a bug in zpty module (fixed in zsh/master) by which a
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11 # zpty that exits will kill all zpty processes that were forked
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12 # before it. Here we set up a zsh exit hook to SIGKILL the zpty
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13 # process immediately, before it has a chance to kill any other
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14 # zpty processes.
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15 zshexit() {
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16 kill -KILL $$
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17 sleep 1 # Block for long enough for the signal to come through
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18 }
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19
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20 # Don't add any extra carriage returns
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21 stty -onlcr
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22
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23 # Don't translate carriage returns to newlines
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24 stty -icrnl
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25
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26 # Silence any error messages
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27 exec 2>/dev/null
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28
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29 local last_pid
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30
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31 while IFS='' read -r -d $'\0' query; do
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32 # Kill last bg process
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33 kill -KILL $last_pid &>/dev/null
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34
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35 # Run suggestion search in the background
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36 (
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37 local suggestion
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38 _zsh_autosuggest_fetch_suggestion "$query"
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39 echo -n -E "$suggestion"$'\0'
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40 ) &
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41
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42 last_pid=$!
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43 done
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44 }
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45
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46 _zsh_autosuggest_async_request() {
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47 # Write the query to the zpty process to fetch a suggestion
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48 zpty -w -n $ZSH_AUTOSUGGEST_ASYNC_PTY_NAME "${1}"$'\0'
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49 }
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50
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51 # Called when new data is ready to be read from the pty
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52 # First arg will be fd ready for reading
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53 # Second arg will be passed in case of error
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54 _zsh_autosuggest_async_response() {
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55 setopt LOCAL_OPTIONS EXTENDED_GLOB
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56
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57 local suggestion
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58
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59 zpty -rt $ZSH_AUTOSUGGEST_ASYNC_PTY_NAME suggestion '*'$'\0' 2>/dev/null
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60 zle autosuggest-suggest -- "${suggestion%%$'\0'##}"
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61 }
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62
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63 _zsh_autosuggest_async_pty_create() {
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64 # With newer versions of zsh, REPLY stores the fd to read from
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65 typeset -h REPLY
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66
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67 # If we won't get a fd back from zpty, try to guess it
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68 if (( ! $_ZSH_AUTOSUGGEST_ZPTY_RETURNS_FD )); then
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69 integer -l zptyfd
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70 exec {zptyfd}>&1 # Open a new file descriptor (above 10).
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71 exec {zptyfd}>&- # Close it so it's free to be used by zpty.
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72 fi
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73
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74 # Fork a zpty process running the server function
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75 zpty -b $ZSH_AUTOSUGGEST_ASYNC_PTY_NAME _zsh_autosuggest_async_server
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76
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77 # Store the fd so we can remove the handler later
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78 if (( REPLY )); then
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79 _ZSH_AUTOSUGGEST_PTY_FD=$REPLY
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80 else
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81 _ZSH_AUTOSUGGEST_PTY_FD=$zptyfd
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82 fi
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83
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84 # Set up input handler from the zpty
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85 zle -F $_ZSH_AUTOSUGGEST_PTY_FD _zsh_autosuggest_async_response
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86 }
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87
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88 _zsh_autosuggest_async_pty_destroy() {
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89 # Remove the input handler
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90 zle -F $_ZSH_AUTOSUGGEST_PTY_FD &>/dev/null
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91
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92 # Destroy the zpty
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93 zpty -d $ZSH_AUTOSUGGEST_ASYNC_PTY_NAME &>/dev/null
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94 }
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95
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96 _zsh_autosuggest_async_pty_recreate() {
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97 _zsh_autosuggest_async_pty_destroy
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98 _zsh_autosuggest_async_pty_create
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99 }
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100
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101 _zsh_autosuggest_async_start() {
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102 typeset -g _ZSH_AUTOSUGGEST_PTY_FD
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103
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104 _zsh_autosuggest_feature_detect_zpty_returns_fd
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105 _zsh_autosuggest_async_pty_recreate
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106
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107 # We recreate the pty to get a fresh list of history events
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108 add-zsh-hook precmd _zsh_autosuggest_async_pty_recreate
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109 }