✨ Full buffer and cursor support

core/buffers.py

@@ -1,3 +1,4 @@
+from core import cursors
 import os
 
 
@@ -5,7 +6,23 @@ class Buffer:
     def __init__(self, path: str, name: str = None, data: list = None):
         self.path = path
         self.name = name or "[No Name]"
-        self.data = data or [[""]]
+        self.data = data or [""]
+
+    def render(self, instance):
+        # Update the screen information
+        instance.update()
+
+        for y, line in enumerate(self.data[instance.offset[0]:]):
+            if y < instance.safe_height:
+                for x, character in enumerate(line[instance.offset[1]:]):
+                    if x < instance.safe_width:
+                        instance.screen.addstr(y, x + instance.components.get_component_width(
+                            instance.components.components["left"]), character)
+
+                # Write blank spaces for the rest of the line
+                if instance.safe_width - len(line) > 0:
+                    instance.screen.addstr(y, instance.components.get_component_width(
+                        instance.components.components["left"]) + len(line), " " * (instance.safe_width - len(line)))
 
     @staticmethod
     def remove_char(string: str, index: int) -> str:
@@ -31,7 +48,7 @@ def open_file(file_name):
 def load_file(file_path=None):
     # Default settings for a file
     file_name = "[No Name]"
-    file_data = [[""]]
+    file_data = [""]
 
     if file_path:
         # Set the file's name

core/components.py

@@ -22,9 +22,14 @@ class StatusBar:
 class Components:
     def __init__(self, components: dict = None):
         self.components = components or {
+            "left": [[" "], ["12222"], [""]],
             "bottom": [StatusBar],
         }
 
+    @staticmethod
+    def get_component_width(component: list) -> int:
+        return sum(len(max(sub_components)) for sub_components in component if max(sub_components))
+
     def render(self, instance):
         for component in self.components["bottom"]:
             component(instance).render(instance)

core/cursors.py

@@ -1,50 +1,74 @@
 import curses
 
 
-def cursor_mode(mode: str):
-    if mode == "block":
+def mode(to_mode: str):
+    if to_mode == "block":
         print("\033[2 q")
 
-    elif mode == "line":
+    elif to_mode == "line":
         print("\033[6 q")
 
-    elif mode == "hidden":
+    elif to_mode == "hidden":
         curses.curs_set(0)
 
-    elif mode == "visible":
+    elif to_mode == "visible":
         curses.curs_set(1)
 
 
-def cursor_push(instance, direction: (int, str)):
+def push(instance, direction: (int, str)):
     if direction in (0, "up", "north"):
-        # Decrease the y position
+        # If the cursor is at the top of the file
+        if instance.cursor[0] == 0 and not instance.offset[0] == 0:
+            # Move the buffer up
+            instance.offset[0] -= 1
+
+        elif instance.cursor[0] != 0:
+            # Decrease the y position of the cursor
             instance.cursor[0] -= 1
 
+            # Jump to the end of the line
+            if instance.cursor[1] > len(instance.buffer.data[instance.current_line - 1]) - 2:
+                instance.cursor[1] = len(instance.buffer.data[instance.current_line - 1]) - 2
+
     elif direction in (1, "right", "east"):
-        # Increase the x position
+        # Increase the x position of the cursor
+        if instance.cursor[1] < len(instance.buffer.data[instance.current_line]) - 2:
             instance.cursor[1] += 1
 
     elif direction in (2, "down", "south"):
-        # Increase the y position
+        # Check if the cursor is at the bottom of the screen
+        if instance.cursor[0] == instance.safe_height - 2 and not instance.current_line == len(instance.buffer.data):
+            # Move the buffer down
+            instance.offset[0] += 1
+
+        elif instance.cursor[0] != instance.safe_height - 2:
+            # Increase the y position of the cursor
             instance.cursor[0] += 1
 
+            # Jump to the end of the line
+            if instance.cursor[1] > len(instance.buffer.data[instance.current_line + 1]) - 2:
+                instance.cursor[1] = len(instance.buffer.data[instance.current_line + 1]) - 2
+
     elif direction in (3, "left", "west"):
-        # Decrease the x position
+        # Decrease the x position of the cursor
+        if instance.cursor[1] != 0:
             instance.cursor[1] -= 1
 
 
-def check_cursor(instance, cursor: list):
-    cursor[1] = max(2, cursor[1])
-    cursor[1] = min(instance.width - 1, cursor[1])
+def check(instance, cursor: list):
+    # Prevent any values out of bounds (especially important when resizing)
+    cursor[1] = max(0, cursor[1])
+    cursor[1] = min(instance.safe_width - 1, cursor[1])
     cursor[0] = max(0, cursor[0])
     cursor[0] = min(instance.height - 2 - len(instance.components.components["bottom"]), cursor[0])
 
     return cursor
 
 
-def cursor_move(instance):
+def move(instance):
     # Run a final check to see if the cursor is valid
-    instance.cursor = check_cursor(instance, instance.cursor)
+    instance.cursor = check(instance, instance.cursor)
 
     # Moves the cursor to anywhere on the screen
-    instance.screen.move(instance.cursor[0], instance.cursor[1])
+    instance.screen.move(instance.cursor[0], instance.cursor[1] +
+                         instance.components.get_component_width(instance.components.components["left"]))

core/utils.py

@@ -1,7 +1,25 @@
 from core.colors import Codes as c
 import traceback
+from pathlib import Path
 import curses
+import json
 import sys
+import os
+
+
+def load_json(file: str) -> dict:
+    # Load the json file with read permissions
+    with open(file, "r") as f:
+        return json.load(f)
+
+
+def load_config() -> dict:
+    # Parse the path of the config file
+    config_file = f"{Path.home()}/.config/lambda/config.json"
+
+    # Only if the config file exists, attempt to load it
+    if os.path.exists(config_file):
+        return load_json(config_file)
 
 
 def clear(instance, y: int, x: int):

main.py

@@ -8,16 +8,19 @@ import os
 
 
 class Lambda:
-    def __init__(self, buffer: Buffer):
+    def __init__(self, buffer: Buffer, config: dict = None):
         self.screen = curses.initscr()
         self.buffer = buffer
         self.cursor = [0, 0]
+        self.offset = [0, 0]
+        self.current_line = 0
         self.mode = "normal"
         self.components = Components()
-        self.height = self.screen.getmaxyx()[0]
-        self.width = self.screen.getmaxyx()[1]
-        self.safe_height = self.height - len(self.components.components["bottom"])
-        self.config = {"icon": "λ"}
+        self.height = 0
+        self.width = 0
+        self.safe_height = 0
+        self.safe_width = 0
+        self.config = config or {"icon": "λ"}
 
     def update_dimensions(self):
         # Calculate the entire height and width of the terminal
@@ -25,16 +28,20 @@ class Lambda:
 
         # Calculate the safe area for the buffer by removing heights & widths of components
         self.safe_height = self.height - len(self.components.components["bottom"])
+        self.safe_width = self.width - self.components.get_component_width(self.components.components["left"])
 
     def update(self):
-        # Update the dimensions
+        # Update the dimensions of the terminal
         self.update_dimensions()
 
+        # Calculate the current line number
+        self.current_line = self.cursor[0] + self.offset[0]
+
         # Refresh the on-screen components
         self.components.render(self)
 
         # Move the cursor
-        cursors.cursor_move(self)
+        cursors.move(self)
 
     def start(self):
         # Change the escape key delay to 25ms
@@ -45,7 +52,7 @@ class Lambda:
         colors.init_colors()
 
         # Change the cursor shape
-        cursors.cursor_mode("block")
+        cursors.mode("block")
 
         # Don't echo any key-presses
         curses.noecho()
@@ -61,9 +68,9 @@ class Lambda:
         # The main loop, which runs until the user quits
         while True:
             # Write the buffer to the screen
-            # buffers.write_buffer(screen, buffer)
+            self.buffer.render(self)
 
-            # Update the screen
+            # Update the screen variables
             self.update()
 
             # Wait for a keypress
@@ -89,8 +96,11 @@ def main():
     # Load the file into a Buffer object
     buffer = buffers.load_file(args.file)
 
+    # Load the config
+    config = utils.load_config()
+
     # Load lambda with the buffer object
-    screen = Lambda(buffer)
+    screen = Lambda(buffer, config)
 
     # Start the screen, this will loop until exit
     try:

mode/insert.py

@@ -10,4 +10,4 @@ def execute(instance, key):
 
 def activate():
     # Switch the cursor to a line
-    cursors.cursor_mode("line")
+    cursors.mode("line")

mode/normal.py

@@ -6,19 +6,19 @@ from mode import command
 def execute(instance, key):
     if key == ord("j"):
         # Move the cursor down
-        cursors.cursor_push(instance, "down")
+        cursors.push(instance, "down")
 
     elif key == ord("k"):
         # Move the cursor up
-        cursors.cursor_push(instance, "up")
+        cursors.push(instance, "up")
 
     elif key == ord("l"):
         # Move the cursor right
-        cursors.cursor_push(instance, "right")
+        cursors.push(instance, "right")
 
     elif key == ord("h"):
         # Move the cursor left
-        cursors.cursor_push(instance, "left")
+        cursors.push(instance, "left")
 
     elif key == ord("i"):
         # Activate insert mode
@@ -26,7 +26,7 @@ def execute(instance, key):
 
     elif key == ord("I"):
         # Move the cursor to the right
-        cursors.cursor_push(instance, "right")
+        cursors.push(instance, "right")
 
         # Then activate insert mode
         modes.activate(instance, "insert")
@@ -38,4 +38,4 @@ def execute(instance, key):
 
 def activate():
     # Switch the cursor to a block
-    cursors.cursor_mode("block")
+    cursors.mode("block")