Add ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS option

With this the until now hard-coded value of 200 can be configured.

README.md

@@ -58,6 +58,9 @@ For more info, read the Character Highlighting section of the zsh manual: `man z
 
 For example, setting `ZSH_AUTOSUGGEST_STRATEGY=(history completion)` will first try to find a suggestion from your history, but, if it can't find a match, will find a suggestion from the completion engine.
 
+#### When `ZSH_AUTOSUGGEST_STRATEGY` contains `match_prev_cmd`:
+
+- `ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS`: The previous command is only looked at of a number of the most recent commands that match the current prefix. This sets the maximum number of commands to consider. Set it to -1 to always use all matches.
 
 ### Widget Mapping
 

src/config.zsh

@@ -20,6 +20,11 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 	ZSH_AUTOSUGGEST_STRATEGY=(history)
 }
 
+# Maximum number of commands to consider for match_prev_cmd strategy
+# Set to -1 to always use all matches
+(( ! ${+ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS} )) &&
+typeset -g ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS=200
+
 # Widgets that clear the suggestion
 (( ! ${+ZSH_AUTOSUGGEST_CLEAR_WIDGETS} )) && {
 	typeset -ga ZSH_AUTOSUGGEST_CLEAR_WIDGETS

src/strategies/match_prev_cmd.zsh

@@ -48,9 +48,9 @@ _zsh_autosuggest_strategy_match_prev_cmd() {
 	# 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
+	# Iterate over the most recent history event numbers that match $prefix.
 	local key
-	for key in "${(@)history_match_keys[1,200]}"; do
+	for key in "${(@)history_match_keys[1,$ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS]}"; do
 		# Stop if we ran out of history
 		[[ $key -gt 1 ]] || break
 

zsh-autosuggestions.zsh

@@ -46,6 +46,11 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 	ZSH_AUTOSUGGEST_STRATEGY=(history)
 }
 
+# Maximum number of commands to consider for match_prev_cmd strategy
+# Set to -1 to always use all matches
+(( ! ${+ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS} )) &&
+typeset -g ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS=200
+
 # Widgets that clear the suggestion
 (( ! ${+ZSH_AUTOSUGGEST_CLEAR_WIDGETS} )) && {
 	typeset -ga ZSH_AUTOSUGGEST_CLEAR_WIDGETS
@@ -710,9 +715,9 @@ _zsh_autosuggest_strategy_match_prev_cmd() {
 	# Get the previously executed command
 	local prev_cmd="$(_zsh_autosuggest_escape_command "${history[$((HISTCMD-1))]}")"
 
-	# Iterate up to the first 200 history event numbers that match $prefix
+	# Iterate over the most recent history event numbers that match $prefix.
 	local key
-	for key in "${(@)history_match_keys[1,200]}"; do
+	for key in "${(@)history_match_keys[1,$ZSH_AUTOSUGGEST_MATCH_PREV_MAX_CMDS]}"; do
 		# Stop if we ran out of history
 		[[ $key -gt 1 ]] || break