Add basic bash and Python tasks (#10548)

Part of https://github.com/zed-industries/zed/issues/5141

* adds "run selection" and "run file" tasks for bash and Python.
* replaces newlines with `\n` symbols in the human-readable task labels
* properly escapes task command arguments when spawning the task in
terminal

Caveats:

* bash tasks will always use user's default shell to spawn the
selections, but they should rather respect the shebang line even if it's
not selected
* Python tasks will always use `python3` to spawn its tasks now, as
there's no proper mechanism in Zed to deal with different Python
executables

Release Notes:

- Added tasks for bash and Python to execute selections and open files
in terminal

crates/languages/src/python.rs

@@ -1,6 +1,6 @@
 use anyhow::Result;
 use async_trait::async_trait;
-use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
+use language::{ContextProviderWithTasks, LanguageServerName, LspAdapter, LspAdapterDelegate};
 use lsp::LanguageServerBinary;
 use node_runtime::NodeRuntime;
 use std::{
@@ -9,6 +9,7 @@ use std::{
     path::{Path, PathBuf},
     sync::Arc,
 };
+use task::{TaskTemplate, TaskTemplates, VariableName};
 use util::ResultExt;
 
 const SERVER_PATH: &str = "node_modules/pyright/langserver.index.js";
@@ -180,6 +181,30 @@ async fn get_cached_server_binary(
     }
 }
 
+pub(super) fn python_task_context() -> ContextProviderWithTasks {
+    ContextProviderWithTasks::new(TaskTemplates(vec![
+        TaskTemplate {
+            label: "execute selection".to_owned(),
+            command: "python3".to_owned(),
+            args: vec![
+                "-c".to_owned(),
+                format!(
+                    "exec(r'''{}''')",
+                    VariableName::SelectedText.template_value()
+                ),
+            ],
+            ignore_previously_resolved: true,
+            ..TaskTemplate::default()
+        },
+        TaskTemplate {
+            label: format!("run '{}'", VariableName::File.template_value()),
+            command: "python3".to_owned(),
+            args: vec![VariableName::File.template_value()],
+            ..TaskTemplate::default()
+        },
+    ]))
+}
+
 #[cfg(test)]
 mod tests {
     use gpui::{BorrowAppContext, Context, ModelContext, TestAppContext};