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home/.config/zsh/zsh-autosuggestions/src/strategies/match_prev_cmd.zsh

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+
+#--------------------------------------------------------------------#
+# 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) and (x~y) glob operator
+	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 the history items that match the prefix, excluding those that match
+	# the ignore pattern
+	local pattern="$prefix*"
+	if [[ -n $ZSH_AUTOSUGGEST_HISTORY_IGNORE ]]; then
+		pattern="($pattern)~($ZSH_AUTOSUGGEST_HISTORY_IGNORE)"
+	fi
+
+	# Get all history event numbers that correspond to history
+	# entries that match the pattern
+	local history_match_keys
+	history_match_keys=(${(k)history[(R)$~pattern]})
+
+	# By default we use the first history number (most recent history entry)
+	local histkey="${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]"
+}