67 lines
2.3 KiB
Bash
67 lines
2.3 KiB
Bash
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#--------------------------------------------------------------------#
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# Match Previous Command Suggestion Strategy #
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#--------------------------------------------------------------------#
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# Suggests the most recent history item that matches the given
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# prefix and whose preceding history item also matches the most
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# recently executed command.
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#
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# For example, suppose your history has the following entries:
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# - pwd
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# - ls foo
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# - ls bar
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# - pwd
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#
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# Given the history list above, when you type 'ls', the suggestion
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# will be 'ls foo' rather than 'ls bar' because your most recently
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# executed command (pwd) was previously followed by 'ls foo'.
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#
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# Note that this strategy won't work as expected with ZSH options that don't
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# preserve the history order such as `HIST_IGNORE_ALL_DUPS` or
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# `HIST_EXPIRE_DUPS_FIRST`.
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_zsh_autosuggest_strategy_match_prev_cmd() {
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# Reset options to defaults and enable LOCAL_OPTIONS
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emulate -L zsh
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# Enable globbing flags so that we can use (#m) and (x~y) glob operator
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setopt EXTENDED_GLOB
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# TODO: Use (b) flag when we can drop support for zsh older than v5.0.8
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local prefix="${1//(#m)[\\*?[\]<>()|^~#]/\\$MATCH}"
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# Get the history items that match the prefix, excluding those that match
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# the ignore pattern
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local pattern="$prefix*"
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if [[ -n $ZSH_AUTOSUGGEST_HISTORY_IGNORE ]]; then
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pattern="($pattern)~($ZSH_AUTOSUGGEST_HISTORY_IGNORE)"
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fi
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# Get all history event numbers that correspond to history
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# entries that match the pattern
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local history_match_keys
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history_match_keys=(${(k)history[(R)$~pattern]})
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# By default we use the first history number (most recent history entry)
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local histkey="${history_match_keys[1]}"
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# Get the previously executed command
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local prev_cmd="$(_zsh_autosuggest_escape_command "${history[$((HISTCMD-1))]}")"
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# Iterate up to the first 200 history event numbers that match $prefix
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for key in "${(@)history_match_keys[1,200]}"; do
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# Stop if we ran out of history
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[[ $key -gt 1 ]] || break
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# See if the history entry preceding the suggestion matches the
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# previous command, and use it if it does
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if [[ "${history[$((key - 1))]}" == "$prev_cmd" ]]; then
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histkey="$key"
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break
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fi
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done
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# Give back the matched history entry
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typeset -g suggestion="$history[$histkey]"
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}
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