From 7162ae8c641314846f0b565d7614ac8d71dbd628 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Sun, 7 Apr 2024 16:04:23 +0100
Subject: Add merge command

---
 main/command.go | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'main/command.go')

diff --git a/main/command.go b/main/command.go
index 3f22821..6d75974 100644
--- a/main/command.go
+++ b/main/command.go
@@ -44,13 +44,47 @@ func (cmd AppendNextCommand) exec(state *ProgramState) {
 	if err != nil {
 		panic("Missing next value")
 	}
+
+	state.prevStart = nextItem.PrevStart
+	state.start = nextItem.Start
+	state.end = nextItem.End
+	state.nextEnd = nextItem.NextEnd
+
 	state.value = append(state.value, nextItem.Value)
+
 	state.pc++
 }
 func (cmd AppendNextCommand) String() string {
 	return "N"
 }
 
+type MergeCommand struct {}
+func (cmd MergeCommand) exec(state *ProgramState) {
+	nextItem, err := state.in.Read()
+	if err != nil {
+		panic("Missing next value")
+	}
+
+	state.prevStart = nextItem.PrevStart
+	state.start = nextItem.Start
+	state.end = nextItem.End
+	state.nextEnd = nextItem.NextEnd
+
+	if len(state.value) == 0 {
+		state.value = []walk.Value {nextItem.Value}
+	} else {
+		state.value = append(
+			state.value[:len(state.value) - 1],
+			walk.Merge(state.value[len(state.value) - 1], nextItem.Value)...
+		)
+	}
+
+	state.pc++
+}
+func (cmd MergeCommand) String() string {
+	return "m"
+}
+
 type DeleteValueCommand struct {}
 func (cmd DeleteValueCommand) exec(state *ProgramState) {
 	state.value = nil
-- 
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