From 3d1fdee7d59d87cef30939bce0b9112846ddf032 Mon Sep 17 00:00:00 2001
From: Ian Jauslin <ian@jauslin.org>
Date: Sat, 16 Oct 2021 12:16:30 -0400
Subject: [PATCH] command prompt: wrap text

---
 command_prompt.py | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/command_prompt.py b/command_prompt.py
index 65e42f0..3cbe64f 100644
--- a/command_prompt.py
+++ b/command_prompt.py
@@ -27,6 +27,9 @@ class Command_prompt(Label):
         # array of command with arguments
         self.argv=[]
 
+        # display characters from window_offset onwards (for text wrapping)
+        self.window_offset=0
+
         # init Label
         super(Command_prompt,self).__init__(**kwargs)
 
@@ -37,19 +40,31 @@ class Command_prompt(Label):
 
 
     def draw(self):
+        # wrap text
+        window_size=int(self.width/self.char_width)
+        if self.cursor>=self.window_offset+window_size:
+            self.window_offset=self.cursor-window_size+1
+        elif self.cursor<self.window_offset:
+            self.window_offset=self.cursor
+        # do not stop right before ':'
+        if self.window_offset==1:
+            self.window_offset=0
+
         with self.canvas.before:
             # background
             Color(0,0,0)
             Rectangle(pos=self.pos,size=self.size)
             # cursor
             Color(1,1,1)
-            Rectangle(pos=(self.pos[0]+self.cursor*self.char_width,self.pos[1]),size=(self.char_width,self.height))
+            # wrap cursor position
+            Rectangle(pos=(self.pos[0]+(self.cursor-self.window_offset)*self.char_width,self.pos[1]),size=(self.char_width,self.height))
 
         # make text under cursor black
-        if self.cursor<len(self.raw_text):
-            self.text=self.raw_text[:self.cursor]+"[color=000]"+self.raw_text[self.cursor]+"[/color]"+self.raw_text[self.cursor+1:]
+        end=min(len(self.raw_text),self.window_offset+window_size)
+        if self.cursor<end:
+            self.text=self.raw_text[self.window_offset:self.cursor]+"[color=000]"+self.raw_text[self.cursor]+"[/color]"+self.raw_text[self.cursor+1:end]
         else:
-            self.text=self.raw_text
+            self.text=self.raw_text[self.window_offset:end]
 
 
     def on_key_down(self, keyboard, keycode, text, modifiers):