From b8390bfac864db2a194ecb5bc8d5972010d13b5a Mon Sep 17 00:00:00 2001
From: Ian Jauslin <ian@jauslin.org>
Date: Fri, 15 Oct 2021 19:57:03 -0400
Subject: [PATCH] Delete text in command box

---
 command_prompt.py | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/command_prompt.py b/command_prompt.py
index f048e21..72c7006 100644
--- a/command_prompt.py
+++ b/command_prompt.py
@@ -45,12 +45,15 @@ class Command_prompt(Label):
             self.text=self.raw_text
 
     def on_key_down(self, keyboard, keycode, text, modifiers):
-        #print(keycode,text,modifiers)
+        print(keycode,text,modifiers)
         if self.insert:
+            # process command
             if keycode[1]=="enter":
                 self.insert=False
                 self.parse_command()
                 self.set_text("")
+
+            # move
             elif keycode[1]=="left":
                 self.move_cursor_relative(-1)
             elif keycode[1]=="right":
@@ -60,6 +63,14 @@ class Command_prompt(Label):
             elif len(modifiers)==1 and modifiers[0]=="ctrl" and text=="e":
                 self.move_cursor(len(self.raw_text))
 
+            # delete
+            elif keycode[1]=="backspace":
+                self.backspace()
+            elif keycode[1]=="delete":
+                self.delete_forward()
+            elif len(modifiers)==1 and modifiers[0]=="ctrl" and text=="k":
+                self.delete_all_forward()
+
     def on_textinput(self,window,text):
         #print(text)
         if self.insert:
@@ -77,6 +88,33 @@ class Command_prompt(Label):
         self.cursor+=len(text)
         self.draw()
 
+    # delete before cursor
+    def backspace(self):
+        # do not delete leading ':'
+        if self.cursor==1:
+            return
+        if self.cursor==len(self.raw_text):
+            self.raw_text=self.raw_text[:self.cursor-1]
+        else:
+            self.raw_text=self.raw_text[:self.cursor-1]+self.raw_text[self.cursor:]
+        self.cursor-=1
+        self.draw()
+    # delete after cursor
+    def delete_forward(self):
+        if self.cursor==len(self.raw_text):
+            return
+        else:
+            self.raw_text=self.raw_text[:self.cursor]+self.raw_text[self.cursor+1:]
+        self.draw()
+    # delete until end of line(self):
+    def delete_all_forward(self):
+        if self.cursor==len(self.raw_text):
+            return
+        else:
+            self.raw_text=self.raw_text[:self.cursor]
+        self.draw()
+        
+
     # set text in prompt
     def set_text(self,text):
         self.raw_text=text