feat: add history search handler

readline/comp-group.go

@@ -64,14 +64,8 @@ func (g *CompletionGroup) init(rl *Instance) {
 	}
 }
 
-// updateTabFind - When searching through all completion groups (whether it be command history or not),
-// we ask each of them to filter its own items and return the results to the shell for aggregating them.
-// The rx parameter is passed, as the shell already checked that the search pattern is valid.
-func (g *CompletionGroup) updateTabFind(rl *Instance) {
-
+func (g *CompletionGroup) filterSuggestions(rl *Instance) []string {
 	suggs := make([]string, 0)
-
-	// We perform filter right here, so we create a new completion group, and populate it with our results.
 	for i := range g.Suggestions {
 		if rl.regexSearch == nil { continue }
 		if rl.regexSearch.MatchString(g.Suggestions[i]) {
@@ -82,8 +76,20 @@ func (g *CompletionGroup) updateTabFind(rl *Instance) {
 		}
 	}
 
-	// We overwrite the group's items, (will be refreshed as soon as something is typed in the search)
-	g.Suggestions = suggs
+	return suggs
+}
+
+// updateTabFind - When searching through all completion groups (whether it be command history or not),
+// we ask each of them to filter its own items and return the results to the shell for aggregating them.
+// The rx parameter is passed, as the shell already checked that the search pattern is valid.
+func (g *CompletionGroup) updateTabFind(rl *Instance) {
+	// We perform filter right here, so we create a new completion group, and populate it with our results.
+	// Then overwrite the group's items, (will be refreshed as soon as something is typed in the search)
+	if rl.searchMode != HistoryFind {
+		g.Suggestions = g.filterSuggestions(rl)
+	} else {
+		g.Suggestions = rl.HistorySearcher(string(rl.tfLine))
+	}
 
 	// Finally, the group computes its new printing settings
 	g.init(rl)

readline/instance.go

@@ -200,6 +200,8 @@ type Instance struct {
 	ViActionCallback func(ViAction, []string)
 
 	RawInputCallback func([]rune) // called on all input
+
+	HistorySearcher func(string) []string
 }
 
 // NewInstance is used to create a readline instance and initialise it with sane defaults.
@@ -229,6 +231,10 @@ func NewInstance() *Instance {
 	rl.evtKeyPress = make(map[string]func(string, []rune, int) *EventReturn)
 	rl.TempDirectory = os.TempDir()
 
+	rl.HistorySearcher = func(filter string) []string {
+		grps := rl.completeHistory()
+		return grps[0].filterSuggestions(rl)
+	}
 	// Registers
 	rl.initRegisters()
 

rl.go

@@ -27,6 +27,25 @@ func newLineReader(prompt string, noHist bool) *lineReader {
 		rl.SetHistoryCtrlR("History", fileHist)
 		rl.HistoryAutoWrite = false
 	}
+	oldSearcher := rl.HistorySearcher
+	rl.HistorySearcher = func(filter string) []string {
+		searcherHandler := hshMod.Get(rt.StringValue("history")).AsTable().Get(rt.StringValue("searcher"))
+		if searcherHandler == rt.NilValue {
+			return oldSearcher(filter)
+		}
+
+		ret, err := rt.Call1(l.MainThread(), searcherHandler, rt.StringValue(filter))
+		entries := []string{}
+		if err == nil && ret.Type() == rt.TableType {
+			util.ForEach(ret.AsTable(), func(k rt.Value, v rt.Value) {
+				if k.Type() == rt.IntType && v.Type() == rt.StringType {
+					entries = append(entries, v.AsString())
+				}
+			})
+		}
+
+		return entries
+	}
 	rl.ShowVimMode = false
 	rl.ViModeCallback = func(mode readline.ViMode) {
 		modeStr := ""