Keep track of open terminals

Co-Authored-By: Petros Amoiridis <petros@hey.com>
Co-Authored-By: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/project/src/terminals.rs

@@ -0,0 +1,63 @@
+use std::path::PathBuf;
+
+use gpui::{ModelContext, ModelHandle, WeakModelHandle};
+use settings::Settings;
+use terminal::{Terminal, TerminalBuilder};
+
+use crate::Project;
+
+pub struct Terminals {
+    pub(crate) local_handles: Vec<WeakModelHandle<terminal::Terminal>>,
+}
+
+impl Project {
+    pub fn create_terminal(
+        &mut self,
+        working_directory: Option<PathBuf>,
+        window_id: usize,
+        cx: &mut ModelContext<Self>,
+    ) -> anyhow::Result<ModelHandle<Terminal>> {
+        if self.is_remote() {
+            return Err(anyhow::anyhow!(
+                "creating terminals as a guest is not supported yet"
+            ));
+        } else {
+            let settings = cx.global::<Settings>();
+            let shell = settings.terminal_shell();
+            let envs = settings.terminal_env();
+            let scroll = settings.terminal_scroll();
+
+            let terminal = TerminalBuilder::new(
+                working_directory.clone(),
+                shell,
+                envs,
+                settings.terminal_overrides.blinking.clone(),
+                scroll,
+                window_id,
+            )
+            .map(|builder| {
+                let terminal_handle = cx.add_model(|cx| builder.subscribe(cx));
+
+                self.terminals
+                    .local_handles
+                    .push(terminal_handle.downgrade());
+
+                let id = terminal_handle.id();
+                cx.observe_release(&terminal_handle, move |project, _terminal, _cx| {
+                    let handles = &mut project.terminals.local_handles;
+
+                    if let Some(index) = handles.iter().position(|terminal| terminal.id() == id) {
+                        handles.remove(index);
+                    }
+                })
+                .detach();
+
+                terminal_handle
+            });
+
+            terminal
+        }
+    }
+}
+
+// TODO: Add a few tests for adding and removing terminal tabs