feat: added some env vars for task executions

docs/tasks/file-tasks.md

@@ -103,3 +103,20 @@ Completions will now be enabled for your task. In this example, `mise run build
 will show `debug` and `release` as options. The `--user` flag will also show completions generated by the output of `mycli users`.
 
 (Note that cli and markdown help for tasks is not yet implemented in mise as of this writing but that is planned.)
+
+## CWD
+
+mise sets the current working directory to the directory of `mise.toml` before running tasks.
+This can be overridden by setting `dir="{{cwd}}"` in the task header:
+
+```bash
+#!/usr/bin/env bash
+#MISE dir="{{cwd}}"
+```
+
+Also, the original working directory is available in the `MISE_ORIGINAL_CWD` environment variable:
+
+```bash
+#!/usr/bin/env bash
+cd "$MISE_ORIGINAL_CWD"
+```

docs/tasks/index.md

@@ -65,3 +65,14 @@ as `~/src/work/myproject/mise.local.toml` and they will be used inside tasks of
 
 As of this writing vars are only supported in TOML tasks. I want to add support for file tasks, but
 I don't want to turn all file tasks into tera templates just for this feature.
+
+## Environment variables passed to tasks
+
+The following environment variables are passed to the task:
+
+- `MISE_ORIGINAL_CWD`: The original working directory from where the task was run.
+- `MISE_CONFIG_ROOT`: The directory containing the `mise.toml` file where the task was defined.
+- `MISE_PROJECT_ROOT`: The root of the project.
+- `MISE_TASK_NAME`: The name of the task being run.
+- `MISE_TASK_DIR`: The directory containing the task script.
+- `MISE_TASK_FILE`: The full path to the task script.

src/cli/run.rs

@@ -207,6 +207,9 @@ impl Run {
             ..Default::default()
         })?;
         let mut env = ts.env_with_path(&CONFIG)?;
+        if let Some(cwd) = &*dirs::CWD {
+            env.insert("MISE_ORIGINAL_CWD".into(), cwd.display().to_string());
+        }
         if let Some(root) = &CONFIG.project_root {
             env.insert("MISE_PROJECT_ROOT".into(), root.display().to_string());
             env.insert("root".into(), root.display().to_string());
@@ -300,6 +303,16 @@ impl Run {
             return Ok(());
         }
 
+        let mut env = env.clone();
+        env.insert("MISE_TASK_NAME".into(), task.name.clone());
+        let task_file = task.file.as_ref().unwrap_or(&task.config_source);
+        env.insert("MISE_TASK_FILE".into(), task_file.display().to_string());
+        if let Some(dir) = task_file.parent() {
+            env.insert("MISE_TASK_DIR".into(), dir.display().to_string());
+        }
+        if let Some(config_root) = &task.config_root {
+            env.insert("MISE_CONFIG_ROOT".into(), config_root.display().to_string());
+        }
         let string_env: Vec<(String, String)> = task
             .env
             .iter()
@@ -417,7 +430,9 @@ impl Run {
         trace!("using shell: {}", shell.join(" "));
         let mut full_args = shell.clone();
         let mut script = script.to_string();
-        if shell[0] == "sh" || shell[0] == "bash" || shell[0] == "zsh" {
+        if script.lines().count() > 1
+            && (shell[0] == "sh" || shell[0] == "bash" || shell[0] == "zsh")
+        {
             script = format!("set -e\n{}", script);
         }
         if !args.is_empty() {

src/task/mod.rs

@@ -49,7 +49,7 @@ pub struct Task {
     #[serde(default)]
     pub env: BTreeMap<String, EitherStringOrIntOrBool>,
     #[serde(default)]
-    pub dir: Option<PathBuf>,
+    pub dir: Option<String>,
     #[serde(default)]
     pub hide: bool,
     #[serde(default)]
@@ -313,13 +313,12 @@ impl Task {
         if let Some(dir) = &self.dir {
             // TODO: memoize
             // let dir = self.dir_rendered.get_or_try_init(|| -> Result<PathBuf> {
-            let dir = dir.to_string_lossy().to_string();
             let mut tera = get_tera(self.config_root.as_deref());
             let mut ctx = BASE_CONTEXT.clone();
             if let Some(config_root) = &self.config_root {
                 ctx.insert("config_root", config_root);
             }
-            let dir = tera.render_str(&dir, &ctx)?;
+            let dir = tera.render_str(dir, &ctx)?;
             let dir = file::replace_path(&dir);
             if dir.is_absolute() {
                 Ok(Some(dir.to_path_buf()))