✨ Quality of life code changes

.gitignore

@@ -1,2 +1,4 @@
-/target
-.idea
+__pycache__
+core/__pycache__
+mode/__pycache__
+.idea

README.md

@@ -1 +1,14 @@
-# lambda
+# λ lambda
+Next generation hackable text editor for nerds.
+
+### Overview
+Lambda is a similar text editor to `vim` or `kakoune`.<br>
+However, it has a few key differences:
+- Lambda is written in Python, so it is easy to hack and learn.
+- Lambda is incredibly modular, so you can easily add new features.
+- Lambda is written in a way that makes it easy to use in a terminal.
+- Lambda follows the unix philosophy of "do one thing and do it well."
+  - It has no bloated features, like splits or tabs
+  - It contains the bare necessities and provides a few extra modules
+- Lambda is extremely fast and makes use of efficient memory management.
+- Lambda has much better default keybindings than other text editors.

core/components.py

@@ -4,19 +4,18 @@ import curses
 
 class StatusBar:
     def __init__(self, instance):
-        self.instance = instance
         self.mode = instance.mode.upper()
         self.file = instance.buffer.name or "[No Name]"
         self.icon = instance.config["icon"] or "λ"
         self.colors = (7, 5, 13)
         self.components = [self.icon, self.mode, self.file]
 
-    def render(self):
+    def render(self, instance):
         x = 1
-        utils.clear(self.instance, self.instance.height - 2, 0)
+        utils.clear(instance, instance.height - 2, 0)
         for count, component in enumerate(self.components):
-            self.instance.screen.addstr(self.instance.height - 2, x, component,
-                                        curses.color_pair(self.colors[count]) | curses.A_BOLD)
+            instance.screen.addstr(instance.height - 2, x, component,
+                                   curses.color_pair(self.colors[count]) | curses.A_BOLD)
             x += len(component) + 1
 
 
@@ -28,4 +27,4 @@ class Components:
 
     def render(self, instance):
         for component in self.components["bottom"]:
-            component(instance).render()
+            component(instance).render(instance)

core/modes.py

@@ -1,33 +1,29 @@
 from mode import normal, insert, command
 
 
-def activate(instance, mode) -> object:
+def activate(instance, mode):
     # Visibly update the mode
     instance.mode = mode
     instance.update()
 
     if mode == "command":
-        instance = command.activate(instance)
+        # Activate command mode
+        command.activate(instance)
 
     elif mode == "insert":
-        instance = insert.activate(instance)
+        # Activate insert mode
+        insert.activate(instance)
 
     elif mode == "normal":
-        instance = normal.activate(instance)
-
-    return instance
+        # Activate normal mode
+        normal.activate(instance)
 
 
 def handle_key(instance, key):
+    # Normal mode - default keybindings
     if instance.mode == "normal":
-        instance = normal.execute(instance, key)
+        normal.execute(instance, key)
 
     # Insert mode - inserting text to the buffer
     elif instance.mode == "insert":
-        instance = insert.execute(instance, key)
-
-    # Command mode - extra commands for lambda
-    elif instance.mode == "command":
-        instance = command.activate(instance)
-
-    return instance
+        insert.execute(instance, key)

lambda

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-python3 ./lambda.py "$@"
+python3 ./main.py "$@"

main.py

@@ -21,7 +21,10 @@ class Lambda:
         self.config = {"icon": "λ"}
 
     def update_dimensions(self):
+        # Calculate the entire height and width of the terminal
         self.height, self.width = self.screen.getmaxyx()
+
+        # Calculate the safe area for the buffer by removing heights & widths of components
         self.safe_height = self.height - len(self.components.components["bottom"])
 
     def update(self):
@@ -41,7 +44,7 @@ class Lambda:
         # Change the cursor shape
         cursors.cursor_mode("block")
 
-        # Turn no echo on
+        # Don't echo any key-presses
         curses.noecho()
 
         # Show a welcome message if lambda opens with no file
@@ -52,6 +55,7 @@ class Lambda:
         self.run()
 
     def run(self):
+        # The main loop, which runs until the user quits
         while True:
             # Write the buffer to the screen
             # buffers.write_buffer(screen, buffer)
@@ -71,38 +75,47 @@ class Lambda:
 
 
 def main():
-    # Command line arguments
+    # Shell arguments
     parser = argparse.ArgumentParser(description="Next generation hackable text editor for nerds.")
     parser.add_argument("file", metavar="file", type=str, nargs="?",
                         help="The name of a file for lambda to open")
 
-    # Collect the arguments passed into lambda
+    # Collect the arguments passed into lambda at the shell
     args = parser.parse_args()
 
-    # Load the file into buffer
+    # Load the file into a Buffer object
     buffer = buffers.load_file(args.file)
 
     # Change the escape delay to 25ms
     # Fixes an issue where esc takes way too long to press
     os.environ.setdefault("ESCDELAY", "25")
 
-    # Load lambda with the buffer
+    # Load lambda with the buffer object
     screen = Lambda(buffer)
 
-    # Start the screen
+    # Start the screen, this will loop until exit
     try:
         screen.start()
 
-    # KeyboardInterrupt is thrown when ctrl+c is pressed
+    # KeyboardInterrupt is thrown when <C-c> is pressed (exit)
     except KeyboardInterrupt:
+        # Clean up the screen
         curses.endwin()
+
+        # Then, just exit
         sys.exit()
 
+    # Excepts *any* errors that occur
     except Exception as exception:
+        # Clean up the screen
         curses.endwin()
+
+        # Print the error message and traceback
         print(f"{colors.Codes.red}FATAL ERROR:{colors.Codes.end} "
               f"{colors.Codes.yellow}{exception}{colors.Codes.end}\n")
         print(traceback.format_exc())
+
+        # Exit, with an error code
         sys.exit(0)
 
 

mode/command.py

@@ -2,33 +2,31 @@ from core import utils
 
 
 def execute(instance, commands):
-    if not commands:
-        # Quit if there are no commands, don't check anything
-        return instance
+    # Only if commands are given
+    if commands:
+        # Check each command in the list of commands
+        for command in commands:
+            # Write
+            if command == "w":
+                # Write to the file
+                pass
 
-    for command in commands:
-        if command == "w":
-            # Write to the file
-            pass
+            # Quit
+            elif command == "q":
+                # Load a goodbye prompt
+                utils.goodbye(instance)
 
-        elif command == "q":
-            # Load a goodbye prompt
-            utils.goodbye(instance)
-
-        else:
-            utils.error(instance, f"not an editor command: '{command}'")
-
-    return instance
+            # Unknown command
+            else:
+                utils.error(instance, f"not an editor command: '{command}'")
 
 
 def activate(instance):
-    # Start the prompt
+    # Create a prompt, which returns the input (commands)
     commands = utils.prompt(instance, ":")
 
-    # Execute the commands
-    instance = execute(instance, commands)
+    # Execute the commands given
+    execute(instance, commands)
 
-    # Return to normal mode
+    # Return to normal mode once all commands are executed
     instance.mode = "normal"
-
-    return instance

mode/insert.py

@@ -1,18 +1,13 @@
-from core import cursors
-from mode import normal
+from core import cursors, modes
 
 
 def execute(instance, key):
+    # Enter key
     if key == 27:
         # Switch to normal mode
-        instance.mode = "normal"
-        normal.activate(instance)
-
-    return instance
+        modes.activate(instance, "normal")
 
 
 def activate(instance):
     # Switch the cursor to a line
     cursors.cursor_mode("line")
-
-    return instance

mode/normal.py

@@ -22,24 +22,20 @@ def execute(instance, key):
 
     elif key == ord("i"):
         # Activate insert mode
-        instance = modes.activate(instance, "insert")
+        modes.activate(instance, "insert")
 
     elif key == ord("I"):
         # Move the cursor to the right
         instance.cursor = cursors.cursor_push(instance.cursor, "right")
 
         # Then activate insert mode
-        instance = modes.activate(instance, "insert")
+        modes.activate(instance, "insert")
 
     elif key in (ord(":"), ord(";")):
         # Activate command mode
-        instance = modes.activate(instance, "command")
-
-    return instance
+        modes.activate(instance, "command")
 
 
-def activate(instance):
+def activate():
     # Switch the cursor to a block
     cursors.cursor_mode("block")
-
-    return instance