By default, rerunning tasks reuses the same terminal (due to the `"use_new_terminal": false` default) but waits for the previous task to finish before starting (due to the `"allow_concurrent_runs": false` default).

Keep `"use_new_terminal": false` and set `"allow_concurrent_runs": true` to allow cancelling previous tasks on rerun.

## Task templates

Tasks can be defined:

- in the global `tasks.json` file; such tasks are available in all Zed projects you work on. This file is usually located in `~/.config/zed/tasks.json`. You can edit them by using the `zed: open tasks` action.
- in the worktree-specific (local) `.zed/tasks.json` file; such tasks are available only when working on a project with that worktree included. You can edit worktree-specific tasks by using the `zed: open project tasks` action.
- on the fly with [oneshot tasks](#oneshot-tasks). These tasks are project-specific and do not persist across sessions.
- by language extension.

## Variables

Zed tasks act just like your shell; that also means that you can reference environmental variables via sh-esque `$VAR_NAME` syntax. A couple of additional environmental variables are set for your convenience.
These variables allow you to pull information from the current editor and use it in your tasks. The following variables are available:

- `ZED_COLUMN`: current line column
- `ZED_ROW`: current line row
- `ZED_FILE`: absolute path of the currently opened file (e.g. `/Users/my-user/path/to/project/src/main.rs`)
- `ZED_FILENAME`: filename of the currently opened file (e.g. `main.rs`)
- `ZED_DIRNAME`: absolute path of the currently opened file with file name stripped (e.g. `/Users/my-user/path/to/project/src`)
- `ZED_RELATIVE_FILE`: path of the currently opened file, relative to `ZED_WORKTREE_ROOT` (e.g. `src/main.rs`)
- `ZED_RELATIVE_DIR`: path of the currently opened file's directory, relative to `ZED_WORKTREE_ROOT` (e.g. `src`)
- `ZED_STEM`: stem (filename without extension) of the currently opened file (e.g. `main`)
- `ZED_SYMBOL`: currently selected symbol; should match the last symbol shown in a symbol breadcrumb (e.g. `mod tests > fn test_task_contexts`)
- `ZED_SELECTED_TEXT`: currently selected text
- `ZED_WORKTREE_ROOT`: absolute path to the root of the current worktree. (e.g. `/Users/my-user/path/to/project`)
- `ZED_CUSTOM_RUST_PACKAGE`: (Rust-specific) name of the parent package of $ZED_FILE source file.

To use a variable in a task, prefix it with a dollar sign (`$`):

```json
{
  "label": "echo current file's path",
  "command": "echo $ZED_FILE"
}
```

You can also use verbose syntax that allows specifying a default if a given variable is not available: `${ZED_FILE:default_value}`

These environmental variables can also be used in tasks' `cwd`, `args`, and `label` fields.

### Variable Quoting

When working with paths containing spaces or other special characters, please ensure variables are properly escaped.

For example, instead of this (which will fail if the path has a space):

```json
{
  "label": "stat current file",
  "command": "stat $ZED_FILE"
}
```

Provide the following: