1 files changed, 128 insertions, 0 deletions
diff --git a/src/client/cli/mod.rs b/src/client/cli/mod.rs
new file mode 100644
index 0000000..ed2a1bf
--- /dev/null
+++ b/src/client/cli/mod.rs
@@ -0,0 +1,128 @@
+//! In-window Command line interface. Used for operations that are just easier than with GUI.
+//!
+//! Sometimes it is nice to have a GUI, for instance when a selection has to be made, things have to
+//! be moved etc., however for operations like saving/loading and exporting, no such thing has to be
+//! done and the GUI is really just slowing you down (at least in my opinion). For these operations,
+//! it is much better to simply have a command do that specific thing. It is also much easier to
+//! implement a new command, so features can be tested more quickly. For some things, there should
+//! still be a GUI option. With the example of saving/loading, it is much easier to find some hidden
+//! folder in a GUI, so that is definitely a consideration for the future.
+
+pub mod cmd;
+pub use self::cmd::*;
+
+use crate::client::colours::DEFAULT_COLOURS;
+use crate::client::input::{Button, Input};
+use crate::client::Editor;
+use crate::math::Vec2;
+use raylib::drawing::{RaylibDraw, RaylibDrawHandle};
+use std::sync::mpsc::Receiver;
+
+/// The command line interface. Should be created only once per program instance.
+pub struct CLI {
+    text: String,
+    char_pipe: Option<Receiver<char>>,
+}
+
+impl CLI {
+    /// Create a CLI for this instance
+    pub fn new(input: &mut Input) -> Self {
+        input.add_global(Button::Text(':').into());
+
+        Self {
+            text: String::new(),
+            char_pipe: None,
+        }
+    }
+
+    /// Activates the CLI, which will now capture keyboard input and execute commands accordingly.
+    pub fn try_activate(&mut self, input: &mut Input) {
+        if !self.active() {
+            self.char_pipe = input.try_capture_keyboard();
+
+            if self.char_pipe.is_some() {
+                self.text = ":".to_owned();
+            }
+        }
+    }
+
+    /// Deactivate the command line.
+    pub fn deactivate(&mut self) {
+        // Hang up, the input handler will get the message.
+        self.char_pipe = None;
+    }
+
+    /// Checks if the CLI is currently active. This means input to other things should be ignored.
+    pub fn active(&self) -> bool {
+        self.char_pipe.is_some()
+    }
+
+    fn perform_command(&mut self, editor: &mut Editor) {
+        match cmd::parse_command(&self.text[1..]) {
+            Ok(cmd) => match cmd.process(editor) {
+                Ok(res) => self.text = format!("SUCCESS: {}", res),
+                Err(err) => self.text = format!("ERROR: {}", err),
+            },
+            Err(err) => self.text = format!("SYNTAX ERROR: {}", err),
+        }
+    }
+
+    /// Handle input for the command line and perform any commands the user may want to run.
+    pub fn update(&mut self, editor: &mut Editor, input: &mut Input) {
+        /* Check if the CLI is currently active. If not and it should not be activated according to
+         * keyboard input, there is nothing to do.
+         */
+        if !self.active() {
+            if input.poll_global(&Button::Text(':').into()) {
+                self.try_activate(input);
+                if !self.active() {
+                    return;
+                }
+            } else {
+                return;
+            }
+        }
+
+        let rx = self
+            .char_pipe
+            .as_mut()
+            .expect("No character pipe eventhough CLI should be active");
+
+        if let Ok(c) = rx.try_recv() {
+            match c {
+                '\x1B' => self.text.clear(), // Escape
+                '\x7f' => {
+                    self.text.pop();
+                } // Backspace
+                '\n' => {
+                    self.perform_command(editor);
+                    self.deactivate();
+                }
+                c => self.text.push(c),
+            }
+        }
+
+        // When the text is empty, there is also no command marker, so set as inactive and leave.
+        if self.text.is_empty() {
+            self.deactivate()
+        }
+    }
+
+    /// Draw the command line at the bottom of the window.
+    pub fn draw(&self, rld: &mut RaylibDrawHandle) {
+        let pos = Vec2::new(150., rld.get_screen_height() as f32 - 25.);
+
+        rld.draw_rectangle_v(
+            pos,
+            Vec2::new(rld.get_screen_width() as f32 - pos.x, 25.),
+            DEFAULT_COLOURS.cli_background,
+        );
+        rld.draw_text(
+            &self.text,
+            155,
+            rld.get_screen_height() - 22,
+            20,
+            DEFAULT_COLOURS.cli_foreground,
+        );
+    }
+}