From 7ee15dee3eb9b8d0fc49206b9fd9a56e84bd0a1a Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Wed, 11 Jan 2017 10:26:57 +0100
Subject: Multi-key keybindings

---
 config.cpp | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 74 insertions(+), 12 deletions(-)

(limited to 'config.cpp')

diff --git a/config.cpp b/config.cpp
index 76cf3a2..8bd86f7 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1,25 +1,87 @@
+#include <cassert>
 #include <termio.h>
 
 #include "command.h"
 #include "config.h"
+#include "throw.h"
 
 using namespace std;
 
 
-Keybindings global_keybindings={
-	{KEY_CTRL+'Q',{"quit_app"}},
-	{KEY_BACKSPACE,{"delete_backward"}},
-	{KEY_DELETE,{"delete_forward"}},
-	{'\n',{"insert_newline"}},
-	{'\t',{"insert_char","\t"}},
-	{KEY_RIGHT,{"move_forward"}},
-	{KEY_LEFT,{"move_backward"}},
-	{KEY_DOWN,{"move_downward"}},
-	{KEY_UP,{"move_upward"}},
-};
+KeyInputMachine global_keyinput({
+	{{KEY_CTRL+'X',KEY_CTRL+'Q'},{"quit_app"}},
+	{{KEY_BACKSPACE},{"delete_backward"}},
+	{{KEY_DELETE},{"delete_forward"}},
+	{{'\n'},{"insert_newline"}},
+	{{'\t'},{"insert_char","\t"}},
+	{{KEY_RIGHT},{"move_forward"}},
+	{{KEY_LEFT},{"move_backward"}},
+	{{KEY_DOWN},{"move_downward"}},
+	{{KEY_UP},{"move_upward"}},
+});
 
 class Init{public: Init(){
 	for(int i=32;i<127;i++){
-		global_keybindings.emplace(i,Command("insert_char",string(1,(char)i)));
+		global_keyinput.insert({i},Command("insert_char",string(1,(char)i)));
 	}
 }} init_object;
+
+
+KeyInputMachine::TreeNode::~TreeNode(){
+	if(cmd)delete cmd;
+	if(m){
+		for(const pair<int,TreeNode*> &p : *m){
+			if(p.second!=nullptr)delete p.second;
+		}
+	}
+}
+
+KeyInputMachine::KeyInputMachine(){}
+
+KeyInputMachine::KeyInputMachine(const vector<pair<vector<int>,Command>> &list){
+	for(const pair<vector<int>,Command> &p : list){
+		insert(p.first,p.second);
+	}
+}
+
+void KeyInputMachine::insert(const vector<int> &keys,const Command &cmd){
+	assert(keys.size()>0);
+	TreeNode *node=&root;
+	for(int key : keys){
+		if(node->m==nullptr){
+			if(node->cmd){
+				THROW("Ambiguous keybinding!");
+			}
+			node->m=new unordered_map<int,TreeNode*>;
+		}
+		TreeNode *newnode=new TreeNode;
+		(*node->m)[key]=newnode;
+		node=newnode;
+	}
+	if(node->cmd!=nullptr)delete node->cmd;
+	node->cmd=new Command(cmd);
+}
+
+Either<bool,Command> KeyInputMachine::input(int key){
+	if(current->m==nullptr){
+		current=&root;
+		return {Left(),false};
+	}
+	auto it=current->m->find(key);
+	if(it==current->m->end()){
+		current=&root;
+		return {Left(),false};
+	}
+	current=it->second;
+	if(current->cmd!=nullptr){
+		Command *cmd=current->cmd;
+		current=&root;
+		return {Right(),*cmd};
+	} else {
+		return {Left(),true};
+	}
+}
+
+void KeyInputMachine::cancel(){
+	current=&root;
+}
-- 
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