Mercurial > dotfiles
diff .zfun/zsh-autosuggestions/src/strategies/match_prev_cmd.zsh @ 467:e1ce8897030d
zsh: import df6f6f9ff41 of zsh-autosuggestions
author | Augie Fackler <raf@durin42.com> |
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date | Mon, 03 Dec 2018 22:37:29 -0500 |
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new file mode 100644 --- /dev/null +++ b/.zfun/zsh-autosuggestions/src/strategies/match_prev_cmd.zsh @@ -0,0 +1,59 @@ + +#--------------------------------------------------------------------# +# Match Previous Command Suggestion Strategy # +#--------------------------------------------------------------------# +# Suggests the most recent history item that matches the given +# prefix and whose preceding history item also matches the most +# recently executed command. +# +# For example, suppose your history has the following entries: +# - pwd +# - ls foo +# - ls bar +# - pwd +# +# Given the history list above, when you type 'ls', the suggestion +# will be 'ls foo' rather than 'ls bar' because your most recently +# executed command (pwd) was previously followed by 'ls foo'. +# +# Note that this strategy won't work as expected with ZSH options that don't +# preserve the history order such as `HIST_IGNORE_ALL_DUPS` or +# `HIST_EXPIRE_DUPS_FIRST`. + +_zsh_autosuggest_strategy_match_prev_cmd() { + # Reset options to defaults and enable LOCAL_OPTIONS + emulate -L zsh + + # Enable globbing flags so that we can use (#m) + setopt EXTENDED_GLOB + + # TODO: Use (b) flag when we can drop support for zsh older than v5.0.8 + local prefix="${1//(#m)[\\*?[\]<>()|^~#]/\\$MATCH}" + + # Get all history event numbers that correspond to history + # entries that match pattern $prefix* + local history_match_keys + history_match_keys=(${(k)history[(R)$prefix*]}) + + # By default we use the first history number (most recent history entry) + local histkey="${history_match_keys[1]}" + + # Get the previously executed command + local prev_cmd="$(_zsh_autosuggest_escape_command "${history[$((HISTCMD-1))]}")" + + # Iterate up to the first 200 history event numbers that match $prefix + for key in "${(@)history_match_keys[1,200]}"; do + # Stop if we ran out of history + [[ $key -gt 1 ]] || break + + # See if the history entry preceding the suggestion matches the + # previous command, and use it if it does + if [[ "${history[$((key - 1))]}" == "$prev_cmd" ]]; then + histkey="$key" + break + fi + done + + # Give back the matched history entry + typeset -g suggestion="$history[$histkey]" +}