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annotate .zfun/zsh-autosuggestions/src/strategies/match_prev_cmd.zsh @ 477:8373f6924e50

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emacs: kludge around a case of emacs being too clever for me
author Augie Fackler <raf@durin42.com>
date Thu, 21 Feb 2019 19:54:55 -0500
parents e1ce8897030d
children
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1
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2 #--------------------------------------------------------------------#
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3 # Match Previous Command Suggestion Strategy #
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4 #--------------------------------------------------------------------#
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5 # Suggests the most recent history item that matches the given
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6 # prefix and whose preceding history item also matches the most
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7 # recently executed command.
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8 #
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9 # For example, suppose your history has the following entries:
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10 # - pwd
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11 # - ls foo
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12 # - ls bar
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13 # - pwd
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14 #
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15 # Given the history list above, when you type 'ls', the suggestion
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16 # will be 'ls foo' rather than 'ls bar' because your most recently
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17 # executed command (pwd) was previously followed by 'ls foo'.
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18 #
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19 # Note that this strategy won't work as expected with ZSH options that don't
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20 # preserve the history order such as `HIST_IGNORE_ALL_DUPS` or
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21 # `HIST_EXPIRE_DUPS_FIRST`.
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23 _zsh_autosuggest_strategy_match_prev_cmd() {
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24 # Reset options to defaults and enable LOCAL_OPTIONS
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25 emulate -L zsh
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27 # Enable globbing flags so that we can use (#m)
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28 setopt EXTENDED_GLOB
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30 # TODO: Use (b) flag when we can drop support for zsh older than v5.0.8
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31 local prefix="${1//(#m)[\\*?[\]<>()|^~#]/\\$MATCH}"
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32
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33 # Get all history event numbers that correspond to history
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34 # entries that match pattern $prefix*
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35 local history_match_keys
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36 history_match_keys=(${(k)history[(R)$prefix*]})
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38 # By default we use the first history number (most recent history entry)
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39 local histkey="${history_match_keys[1]}"
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40
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41 # Get the previously executed command
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42 local prev_cmd="$(_zsh_autosuggest_escape_command "${history[$((HISTCMD-1))]}")"
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44 # Iterate up to the first 200 history event numbers that match $prefix
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45 for key in "${(@)history_match_keys[1,200]}"; do
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46 # Stop if we ran out of history
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47 [[ $key -gt 1 ]] || break
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48
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49 # See if the history entry preceding the suggestion matches the
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50 # previous command, and use it if it does
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51 if [[ "${history[$((key - 1))]}" == "$prev_cmd" ]]; then
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52 histkey="$key"
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53 break
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54 fi
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55 done
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56
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57 # Give back the matched history entry
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58 typeset -g suggestion="$history[$histkey]"
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59 }