feat: common module options (show_if, on_click, tooltip)

The first three of many options that are common to all modules.

Resolves #36. Resolves partially #34.

docs/Configuration guide.md

@@ -1,6 +1,12 @@
 By default, you get a single bar at the bottom of all your screens.
 To change that, you'll unsurprisingly need a config file.
 
+This page details putting together the skeleton for your config to get you to a stage where you can start configuring modules.
+It may look long and overwhelming, but that is just because the bar supports a lot of scenarios! 
+
+If you want to see some ready-to-go config files check the [examples folder](https://github.com/JakeStanger/ironbar/tree/master/examples) 
+and the example pages in the sidebar.
+
 ## 1. Create config file
 
 The config file lives inside the `ironbar` directory in your XDG_CONFIG_DIR, which is usually `~/.config/ironbar`.
@@ -253,8 +259,11 @@ monitors:
 
 Once you have the basic config structure set up, it's time to actually configure your bar(s).
 
-The following table describes each of the top-level bar config options. 
+Check [here](config) for an example config file for a fully configured bar in each format.
-For details on available modules and each of their config options, check the sidebar.
+
+### 3.1 Top-level options
+
+The following table lists each of the top-level bar config options:
 
 | Name              | Type                                   | Default  | Description                                                                             |
 |-------------------|----------------------------------------|----------|-----------------------------------------------------------------------------------------|
@@ -265,4 +274,15 @@ For details on available modules and each of their config options, check the sid
 | `center`          | `Module[]`                             | `[]`     | Array of center modules.                                                                |
 | `end`             | `Module[]`                             | `[]`     | Array of right or bottom modules.                                                       |
 
-Check [here](config) for an example config file for a fully configured bar in each format.
+### 3.2 Module-level options
+
+The following table lists each of the module-level options that are present on **all** modules.
+For details on available modules and each of their config options, check the sidebar.
+
+For information on the `Script` type, see [here](script).
+
+| Name       | Type               | Default | Description                                                                                                        |
+|------------|--------------------|---------|--------------------------------------------------------------------------------------------------------------------|
+| `show_if`  | `Script [polling]` | `null`  | Polls the script to check its exit code. If exit code is zero, the module is shown. For other codes, it is hidden. |
+| `on_click` | `Script [polling]` | `null`  | Runs the script when the module is clicked.                                                                        |
+| `tooltip`  | `string`           | `null`  | Shows this text on hover.                                                                                          |

docs/Scripts.md

@@ -0,0 +1,91 @@
+There are various places inside the configuration (other than the `script` module)
+that allow script input to dynamically set values.
+
+Scripts are passed to `sh -c`.
+
+Two types of scripts exist: polling and watching:
+
+- Polling scripts will run and wait for exit.
+  Normally they will repeat this at an interval, hence the name, although in some cases they may only run on a user
+  event.
+  If the script exited code 0, the `stdout` will be used. Otherwise, `stderr` will be printed to the log.
+- Watching scripts start a long-running process. Every time the process writes to `stdout`, the last line is captured
+  and used.
+
+One should prefer to use watch-mode where possible, as it removes the overhead of regularly spawning processes.
+That said, there are some cases which only support polling. These are indicated by `Script [polling]` as the option
+type.
+
+## Writing script configs
+
+There are two available config formats for scripts, shorthand as a string, or longhand as an object.
+Shorthand can be used in all cases, but there are some cases (such as embedding scripts inside strings) where longhand
+cannot be used.
+
+In both formats, `mode` is one of `poll` or `watch` and `interval` is the number of milliseconds to wait between
+spawning the script.
+
+Both `mode` and `interval` are optional and can be excluded to fall back to their defaults of `poll` and `5000`
+respectively.
+
+### Shorthand (string)
+
+Shorthand scripts should be written in the format:
+
+```
+mode:interval:script
+```
+
+For example:
+
+```
+poll:5000:uptime -p | cut -d ' ' -f2-
+```
+
+### Longhand (object)
+
+An object consisting of the `cmd` key and optionally the `mode` and/or `interval` keys.
+
+<details>
+<summary>JSON</summary>
+
+```json
+{
+  "mode": "poll",
+  "interval": 5000,
+  "cmd": "uptime -p | cut -d ' ' -f2-"
+}
+```
+</details>
+
+<details>
+<summary>YAML</summary>
+
+```yaml
+mode: poll
+interval: 5000
+cmd: "uptime -p | cut -d ' ' -f2-"
+```
+</details>
+
+<details>
+<summary>YAML</summary>
+
+```toml
+mode = "poll"
+interval = 5000
+cmd = "uptime -p | cut -d ' ' -f2-"
+```
+</details>
+
+<details>
+<summary>Corn</summary>
+
+```corn
+{
+  mode = "poll"
+  interval = 5000
+  cmd = "uptime -p | cut -d ' ' -f2-"
+}
+```
+</details>

docs/_Sidebar.md

@@ -1,6 +1,7 @@
 # Guides
 
 - [Configuration guide](configuration-guide)
+  - [Scripts](scripts)
 - [Styling guide](styling-guide)
 
 # Examples

src/bar.rs

@@ -6,7 +6,8 @@ use crate::modules::mpd::{PlayerCommand, SongUpdate};
 use crate::modules::workspaces::WorkspaceUpdate;
 use crate::modules::{Module, ModuleInfoBuilder, ModuleLocation, ModuleUpdateEvent, WidgetContext};
 use crate::popup::Popup;
-use crate::Config;
+use crate::script::{OutputStream, Script};
+use crate::{await_sync, Config};
 use chrono::{DateTime, Local};
 use color_eyre::Result;
 use gtk::gdk::Monitor;
@@ -16,8 +17,9 @@ use std::collections::HashMap;
 use std::sync::{Arc, RwLock};
 use stray::message::NotifierItemCommand;
 use stray::NotifierItemMessage;
+use tokio::spawn;
 use tokio::sync::mpsc;
-use tracing::{debug, info};
+use tracing::{debug, error, info, trace};
 
 /// Creates a new window for a bar,
 /// sets it up and adds its widgets.
@@ -81,7 +83,11 @@ pub fn create_bar(
     });
 
     debug!("Showing bar");
-    win.show_all();
+    start.show();
+    center.show();
+    end.show();
+    content.show();
+    win.show();
 
     Ok(())
 }
@@ -155,11 +161,60 @@ fn add_modules(
                 controller_tx: ui_tx,
             };
 
+            let common = $module.common.clone();
+
             let widget = $module.into_widget(context, &info)?;
 
-            content.add(&widget.widget);
+            let container = gtk::EventBox::new();
+            container.add(&widget.widget);
+
+            content.add(&container);
             widget.widget.set_widget_name(info.module_name);
 
+            if let Some(show_if) = common.show_if {
+                let script = Script::new_polling(show_if);
+                let container = container.clone();
+
+                let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);
+
+                spawn(async move {
+                    script
+                        .run(|(_, success)| {
+                            tx.send(success)
+                                .expect("Failed to send widget visibility toggle message");
+                        })
+                        .await;
+                });
+
+                rx.attach(None, move |success| {
+                    if success {
+                        container.show_all()
+                    } else {
+                        container.hide()
+                    };
+                    Continue(true)
+                });
+            } else {
+                container.show_all();
+            }
+
+            if let Some(on_click) = common.on_click {
+                let script = Script::new_polling(on_click);
+                container.connect_button_press_event(move |_, _| {
+                    trace!("Running on-click script");
+                    match await_sync(async { script.get_output().await }) {
+                        Ok((OutputStream::Stderr(out), _)) => error!("{out}"),
+                        Err(err) => error!("{err:?}"),
+                        _ => {}
+                    }
+                    Inhibit(false)
+                });
+            }
+
+            if let Some(tooltip) = common.tooltip {
+                container.set_tooltip_text(Some(&tooltip));
+            }
+
             let has_popup = widget.popup.is_some();
             if let Some(popup_content) = widget.popup {
                 popup

src/config.rs

@@ -7,6 +7,7 @@ use crate::modules::script::ScriptModule;
 use crate::modules::sysinfo::SysInfoModule;
 use crate::modules::tray::TrayModule;
 use crate::modules::workspaces::WorkspacesModule;
+use crate::script::ScriptInput;
 use color_eyre::eyre::{Context, ContextCompat};
 use color_eyre::{eyre, Help, Report};
 use dirs::config_dir;
@@ -18,6 +19,13 @@ use std::path::{Path, PathBuf};
 use std::{env, fs};
 use tracing::instrument;
 
+#[derive(Debug, Deserialize, Clone)]
+pub struct CommonConfig {
+    pub show_if: Option<ScriptInput>,
+    pub on_click: Option<ScriptInput>,
+    pub tooltip: Option<String>,
+}
+
 #[derive(Debug, Deserialize, Clone)]
 #[serde(tag = "type", rename_all = "kebab-case")]
 pub enum ModuleConfig {

src/modules/clock.rs

@@ -1,3 +1,4 @@
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use crate::popup::Popup;
 use chrono::{DateTime, Local};
@@ -18,7 +19,10 @@ pub struct ClockModule {
     /// Detail on available tokens can be found here:
     /// <https://docs.rs/chrono/latest/chrono/format/strftime/index.html>
     #[serde(default = "default_format")]
-    pub(crate) format: String,
+    format: String,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 fn default_format() -> String {

src/modules/custom.rs

@@ -1,7 +1,8 @@
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use crate::popup::{ButtonGeometry, Popup};
-use crate::script::exec_command;
+use crate::config::CommonConfig;
 use color_eyre::{Report, Result};
+use crate::script::Script;
 use gtk::prelude::*;
 use gtk::{Button, Label, Orientation};
 use serde::Deserialize;
@@ -17,6 +18,9 @@ pub struct CustomModule {
     bar: Vec<Widget>,
     /// Widgets to add to the popup container
     popup: Option<Vec<Widget>>,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 /// Attempts to parse an `Orientation` from `String`
@@ -164,8 +168,11 @@ impl Module<gtk::Box> for CustomModule {
         spawn(async move {
             while let Some(event) = rx.recv().await {
                 if event.cmd.starts_with('!') {
-                    debug!("executing command: '{}'", &event.cmd[1..]);
+                    let script = Script::from(&event.cmd[1..]);
-                    if let Err(err) = exec_command(&event.cmd[1..]) {
+
+                    debug!("executing command: '{}'", script.cmd);
+                    // TODO: Migrate to use script.run
+                    if let Err(err) = script.get_output().await {
                         error!("{err:?}");
                     }
                 } else if event.cmd == "popup:toggle" {

src/modules/focused.rs

@@ -1,4 +1,5 @@
 use crate::clients::wayland::{self, ToplevelChange};
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use crate::{await_sync, icon};
 use color_eyre::Result;
@@ -23,6 +24,9 @@ pub struct FocusedModule {
     icon_size: i32,
     /// GTK icon theme to use.
     icon_theme: Option<String>,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 const fn default_icon_size() -> i32 {

src/modules/launcher/mod.rs

@@ -4,6 +4,7 @@ mod open_state;
 use self::item::{Item, ItemButton, Window};
 use self::open_state::OpenState;
 use crate::clients::wayland::{self, ToplevelChange};
+use crate::config::CommonConfig;
 use crate::icon::find_desktop_file;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use color_eyre::{Help, Report};
@@ -33,6 +34,9 @@ pub struct LauncherModule {
 
     /// Name of the GTK icon theme to use.
     icon_theme: Option<String>,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 #[derive(Debug, Clone)]

src/modules/mpd.rs

@@ -1,4 +1,5 @@
 use crate::clients::mpd::{get_client, get_duration, get_elapsed, MpdConnectionError};
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use crate::popup::Popup;
 use color_eyre::Result;
@@ -65,6 +66,9 @@ pub struct MpdModule {
     /// Path to root of music directory.
     #[serde(default = "default_music_dir")]
     music_dir: PathBuf,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 fn default_socket() -> String {

src/modules/script.rs

@@ -1,39 +1,32 @@
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
-use crate::script::exec_command;
+use crate::script::{OutputStream, Script, ScriptMode};
 use color_eyre::{Help, Report, Result};
 use gtk::prelude::*;
 use gtk::Label;
 use serde::Deserialize;
-use std::process::Stdio;
+use tokio::spawn;
-use tokio::io::{AsyncBufReadExt, BufReader};
-use tokio::process::Command;
 use tokio::sync::mpsc::{Receiver, Sender};
-use tokio::time::sleep;
-use tokio::{select, spawn};
 use tracing::error;
 
-#[derive(Debug, Deserialize, Clone, Copy)]
-#[serde(rename_all = "kebab-case")]
-enum Mode {
-    Poll,
-    Watch,
-}
-
 #[derive(Debug, Deserialize, Clone)]
 pub struct ScriptModule {
     /// Path to script to execute.
     path: String,
     /// Script execution mode
     #[serde(default = "default_mode")]
-    mode: Mode,
+    mode: ScriptMode,
     /// Time in milliseconds between executions.
     #[serde(default = "default_interval")]
     interval: u64,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 /// `Mode::Poll`
-const fn default_mode() -> Mode {
+const fn default_mode() -> ScriptMode {
-    Mode::Poll
+    ScriptMode::Poll
 }
 
 /// 5000ms
@@ -41,6 +34,16 @@ const fn default_interval() -> u64 {
     5000
 }
 
+impl From<&ScriptModule> for Script {
+    fn from(module: &ScriptModule) -> Self {
+        Self {
+            mode: module.mode,
+            cmd: module.path.clone(),
+            interval: module.interval,
+        }
+    }
+}
+
 impl Module<Label> for ScriptModule {
     type SendMessage = String;
     type ReceiveMessage = ();
@@ -51,78 +54,22 @@ impl Module<Label> for ScriptModule {
         tx: Sender<ModuleUpdateEvent<Self::SendMessage>>,
         _rx: Receiver<Self::ReceiveMessage>,
     ) -> Result<()> {
-        let interval = self.interval;
+        let script: Script = self.into();
-        let path = self.path.clone();
 
-        match self.mode {
+        spawn(async move {
-            Mode::Poll => spawn(async move {
+            script.run(move |(out, _)| match out {
-                loop {
+               OutputStream::Stdout(stdout) => {
-                    match exec_command(&path) {
+                   tx.try_send(ModuleUpdateEvent::Update(stdout))
-                        Ok(stdout) => tx
+                       .expect("Failed to send stdout"); }
-                            .send(ModuleUpdateEvent::Update(stdout))
+               OutputStream::Stderr(stderr) => {
-                            .await
+                   error!("{:?}", Report::msg(stderr)
-                            .expect("Failed to send stdout"),
-                        Err(err) => error!("{:?}", err),
-                    }
-
-                    sleep(tokio::time::Duration::from_millis(interval)).await;
-                }
-            }),
-            Mode::Watch => spawn(async move {
-                loop {
-                    let mut handle = Command::new("sh")
-                        .args(["-c", &path])
-                        .stdout(Stdio::piped())
-                        .stderr(Stdio::piped())
-                        .stdin(Stdio::null())
-                        .spawn()
-                        .expect("Failed to spawn process");
-
-                    let mut stdout_lines = BufReader::new(
-                        handle
-                            .stdout
-                            .take()
-                            .expect("Failed to take script handle stdout"),
-                    )
-                    .lines();
-
-                    let mut stderr_lines = BufReader::new(
-                        handle
-                            .stderr
-                            .take()
-                            .expect("Failed to take script handle stderr"),
-                    )
-                    .lines();
-
-                    loop {
-                        select! {
-                            _ = handle.wait() => break,
-                            Ok(Some(line)) = stdout_lines.next_line() => {
-                                tx.send(ModuleUpdateEvent::Update(line.to_string()))
-                            .await
-                            .expect("Failed to send stdout");
-                            }
-                            Ok(Some(line)) = stderr_lines.next_line() => {
-                                error!("{:?}", Report::msg(line)
                                     .wrap_err("Watched script error:")
                                     .suggestion("Check the path to your script")
                                     .suggestion("Check the script for errors")
-                                    .suggestion("If you expect the script to write to stderr, consider redirecting its output to /dev/null to suppress these messages")
+                                    .suggestion("If you expect the script to write to stderr, consider redirecting its output to /dev/null to suppress these messages"));
-                                )
+               }
-                            }
+           }).await;
-                        }
+        });
-                    }
-
-                    while let Ok(Some(line)) = stdout_lines.next_line().await {
-                        tx.send(ModuleUpdateEvent::Update(line.to_string()))
-                            .await
-                            .expect("Failed to send stdout");
-                    }
-
-                    sleep(tokio::time::Duration::from_millis(interval)).await;
-                }
-            }),
-        };
 
         Ok(())
     }

src/modules/sysinfo.rs

@@ -1,3 +1,4 @@
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use color_eyre::Result;
 use gtk::prelude::*;
@@ -19,6 +20,9 @@ pub struct SysInfoModule {
     /// Number of seconds between refresh
     #[serde(default = "Interval::default")]
     interval: Interval,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 #[derive(Debug, Deserialize, Copy, Clone)]

src/modules/tray.rs

@@ -1,5 +1,6 @@
 use crate::await_sync;
 use crate::clients::system_tray::get_tray_event_client;
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use color_eyre::Result;
 use gtk::prelude::*;
@@ -14,7 +15,10 @@ use tokio::sync::mpsc;
 use tokio::sync::mpsc::{Receiver, Sender};
 
 #[derive(Debug, Deserialize, Clone)]
-pub struct TrayModule;
+pub struct TrayModule {
+    #[serde(flatten)]
+    pub common: CommonConfig,
+}
 
 /// Gets a GTK `Image` component
 /// for the status notifier item's icon.

src/modules/workspaces.rs

@@ -1,5 +1,6 @@
 use crate::await_sync;
 use crate::clients::sway::{get_client, get_sub_client};
+use crate::config::CommonConfig;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use color_eyre::{Report, Result};
 use gtk::prelude::*;
@@ -19,6 +20,9 @@ pub struct WorkspacesModule {
     /// Whether to display buttons for all monitors.
     #[serde(default = "crate::config::default_false")]
     all_monitors: bool,
+
+    #[serde(flatten)]
+    pub common: CommonConfig,
 }
 
 #[derive(Clone, Debug)]

src/script.rs

@@ -1,36 +1,354 @@
 use color_eyre::eyre::WrapErr;
-use color_eyre::{Help, Report, Result};
+use color_eyre::{Report, Result};
-use std::process::Command;
+use serde::Deserialize;
-use tracing::instrument;
+use std::fmt::{Display, Formatter};
+use std::process::Stdio;
+use tokio::io::{AsyncBufReadExt, BufReader};
+use tokio::process::Command;
+use tokio::sync::mpsc;
+use tokio::time::sleep;
+use tokio::{select, spawn};
+use tracing::{error, warn};
 
-/// Attempts to execute a given command,
+#[derive(Debug, Deserialize, Clone)]
-/// waiting for it to finish.
+#[serde(untagged)]
-/// If the command returns status 0,
+pub enum ScriptInput {
-/// the `stdout` is returned.
+    String(String),
-/// Otherwise, an `Err` variant
+    Struct(Script),
-/// containing the `stderr` is returned.
+}
-#[instrument]
-pub fn exec_command(command: &str) -> Result<String> {
-    let output = Command::new("sh")
-        .arg("-c")
-        .arg(command)
-        .output()
-        .wrap_err("Failed to get script output")?;
 
-    if output.status.success() {
+#[derive(Debug, Deserialize, Clone, Copy, Eq, PartialEq)]
-        let stdout = String::from_utf8(output.stdout)
+#[serde(rename_all = "snake_case")]
-            .map(|output| output.trim().to_string())
+pub enum ScriptMode {
-            .wrap_err("Script stdout not valid UTF-8")?;
+    Poll,
+    Watch,
+}
 
-        Ok(stdout)
+#[derive(Debug, Clone)]
-    } else {
+pub enum OutputStream {
-        let stderr = String::from_utf8(output.stderr)
+    Stdout(String),
-            .map(|output| output.trim().to_string())
+    Stderr(String),
-            .wrap_err("Script stderr not valid UTF-8")?;
+}
 
-        Err(Report::msg(stderr)
+impl From<&str> for ScriptMode {
-            .wrap_err("Script returned non-zero error code")
+    fn from(str: &str) -> Self {
-            .suggestion("Check the path to your script")
+        match str {
-            .suggestion("Check the script for errors"))
+            "poll" | "p" => Self::Poll,
+            "watch" | "w" => Self::Watch,
+            _ => {
+                warn!("Invalid script mode: '{str}', falling back to polling");
+                ScriptMode::Poll
+            }
+        }
+    }
+}
+
+impl Default for ScriptMode {
+    fn default() -> Self {
+        Self::Poll
+    }
+}
+
+impl Display for ScriptMode {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                ScriptMode::Poll => "poll",
+                ScriptMode::Watch => "watch",
+            }
+        )
+    }
+}
+
+impl ScriptMode {
+    fn try_parse(str: &str) -> Result<Self> {
+        match str {
+            "poll" | "p" => Ok(Self::Poll),
+            "watch" | "w" => Ok(Self::Watch),
+            _ => Err(Report::msg(format!("Invalid script mode: {str}"))),
+        }
+    }
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Script {
+    #[serde(default = "ScriptMode::default")]
+    pub(crate) mode: ScriptMode,
+    pub cmd: String,
+    #[serde(default = "default_interval")]
+    pub(crate) interval: u64,
+}
+
+const fn default_interval() -> u64 {
+    5000
+}
+
+impl Default for Script {
+    fn default() -> Self {
+        Self {
+            mode: ScriptMode::default(),
+            interval: default_interval(),
+            cmd: String::new(),
+        }
+    }
+}
+
+impl From<ScriptInput> for Script {
+    fn from(input: ScriptInput) -> Self {
+        match input {
+            ScriptInput::String(string) => Self::from(string.as_str()),
+            ScriptInput::Struct(script) => script,
+        }
+    }
+}
+
+#[derive(Debug)]
+enum ScriptInputToken {
+    Mode(ScriptMode),
+    Interval(u64),
+    Cmd(String),
+    Colon,
+}
+
+impl From<&str> for Script {
+    fn from(str: &str) -> Self {
+        let mut script = Self::default();
+        let mut tokens = vec![];
+
+        let mut chars = str.chars().collect::<Vec<_>>();
+        while !chars.is_empty() {
+            let char = chars[0];
+
+            let (token, skip) = match char {
+                ':' => (ScriptInputToken::Colon, 1),
+                // interval
+                '0'..='9' => {
+                    let interval_str = chars
+                        .iter()
+                        .take_while(|c| c.is_ascii_digit())
+                        .collect::<String>();
+                    (
+                        ScriptInputToken::Interval(
+                            interval_str.parse::<u64>().expect("Invalid interval"),
+                        ),
+                        interval_str.len(),
+                    )
+                }
+                // watching or polling
+                'w' | 'p' => {
+                    let mode_str = chars.iter().take_while(|&c| c != &':').collect::<String>();
+                    let len = mode_str.len();
+
+                    let token = ScriptMode::try_parse(&mode_str)
+                        .map_or(ScriptInputToken::Cmd(mode_str), |mode| {
+                            ScriptInputToken::Mode(mode)
+                        });
+
+                    (token, len)
+                }
+                _ => {
+                    let cmd_str = chars.iter().take_while(|_| true).collect::<String>();
+                    let len = cmd_str.len();
+                    (ScriptInputToken::Cmd(cmd_str), len)
+                }
+            };
+
+            tokens.push(token);
+            chars.drain(..skip);
+        }
+
+        for token in tokens {
+            match token {
+                ScriptInputToken::Mode(mode) => script.mode = mode,
+                ScriptInputToken::Interval(interval) => script.interval = interval,
+                ScriptInputToken::Cmd(cmd) => script.cmd = cmd,
+                ScriptInputToken::Colon => {}
+            }
+        }
+
+        script
+    }
+}
+
+impl Script {
+    pub fn new_polling(input: ScriptInput) -> Self {
+        let mut script = Self::from(input);
+        script.mode = ScriptMode::Poll;
+        script
+    }
+
+    pub async fn run<F>(&self, callback: F)
+    where
+        F: Fn((OutputStream, bool)),
+    {
+        loop {
+            match self.mode {
+                ScriptMode::Poll => match self.get_output().await {
+                    Ok(output) => callback(output),
+                    Err(err) => error!("{err:?}"),
+                },
+                ScriptMode::Watch => match self.spawn().await {
+                    Ok(mut rx) => {
+                        while let Some(msg) = rx.recv().await {
+                            callback((msg, true));
+                        }
+                    }
+                    Err(err) => error!("{err:?}"),
+                },
+            };
+
+            sleep(tokio::time::Duration::from_millis(self.interval)).await;
+        }
+    }
+
+    /// Attempts to execute a given command,
+    /// waiting for it to finish.
+    /// If the command returns status 0,
+    /// the `stdout` is returned.
+    /// Otherwise, an `Err` variant
+    /// containing the `stderr` is returned.
+    pub async fn get_output(&self) -> Result<(OutputStream, bool)> {
+        let output = Command::new("sh")
+            .args(["-c", &self.cmd])
+            .output()
+            .await
+            .wrap_err("Failed to get script output")?;
+
+        if output.status.success() {
+            let stdout = String::from_utf8(output.stdout)
+                .map(|output| output.trim().to_string())
+                .wrap_err("Script stdout not valid UTF-8")?;
+
+            Ok((OutputStream::Stdout(stdout), true))
+        } else {
+            let stderr = String::from_utf8(output.stderr)
+                .map(|output| output.trim().to_string())
+                .wrap_err("Script stderr not valid UTF-8")?;
+
+            Ok((OutputStream::Stderr(stderr), false))
+        }
+    }
+
+    pub async fn spawn(&self) -> Result<mpsc::Receiver<OutputStream>> {
+        let mut handle = Command::new("sh")
+            .args(["-c", &self.cmd])
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .stdin(Stdio::null())
+            .spawn()?;
+
+        let mut stdout_lines = BufReader::new(
+            handle
+                .stdout
+                .take()
+                .expect("Failed to take script handle stdout"),
+        )
+        .lines();
+
+        let mut stderr_lines = BufReader::new(
+            handle
+                .stderr
+                .take()
+                .expect("Failed to take script handle stderr"),
+        )
+        .lines();
+
+        let (tx, rx) = mpsc::channel(32);
+
+        spawn(async move {
+            loop {
+                select! {
+                    _ = handle.wait() => break,
+                    Ok(Some(line)) = stdout_lines.next_line() => {
+                        tx.send(OutputStream::Stdout(line)).await.expect("Failed to send stdout");
+                    }
+                    Ok(Some(line)) = stderr_lines.next_line() => {
+                        tx.send(OutputStream::Stderr(line)).await.expect("Failed to send stderr");
+                    }
+                }
+            }
+        });
+
+        Ok(rx)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_basic() {
+        let cmd = "echo 'hello'";
+        let script = Script::from(cmd);
+
+        assert_eq!(script.cmd, cmd);
+        assert_eq!(script.interval, default_interval());
+        assert_eq!(script.mode, ScriptMode::default());
+    }
+
+    #[test]
+    fn test_parse_full() {
+        let cmd = "echo 'hello'";
+        let mode = ScriptMode::Watch;
+        let interval = 300;
+
+        let full_cmd = format!("{mode}:{interval}:{cmd}");
+        let script = Script::from(full_cmd.as_str());
+
+        assert_eq!(script.cmd, cmd);
+        assert_eq!(script.mode, mode);
+        assert_eq!(script.interval, interval);
+    }
+
+    #[test]
+    fn test_parse_interval_and_cmd() {
+        let cmd = "echo 'hello'";
+        let interval = 300;
+
+        let full_cmd = format!("{interval}:{cmd}");
+        let script = Script::from(full_cmd.as_str());
+
+        assert_eq!(script.cmd, cmd);
+        assert_eq!(script.interval, interval);
+        assert_eq!(script.mode, ScriptMode::default());
+    }
+
+    #[test]
+    fn test_parse_mode_and_cmd() {
+        let cmd = "echo 'hello'";
+        let mode = ScriptMode::Watch;
+
+        let full_cmd = format!("{mode}:{cmd}");
+        let script = Script::from(full_cmd.as_str());
+
+        assert_eq!(script.cmd, cmd);
+        assert_eq!(script.interval, default_interval());
+        assert_eq!(script.mode, mode);
+    }
+
+    #[test]
+    fn test_parse_cmd_with_colon() {
+        let cmd = "uptime | awk '{print \"Uptime: \" $1}'";
+        let script = Script::from(cmd);
+
+        assert_eq!(script.cmd, cmd);
+        assert_eq!(script.interval, default_interval());
+        assert_eq!(script.mode, ScriptMode::default());
+    }
+
+    #[test]
+    fn test_no_cmd() {
+        let mode = ScriptMode::Watch;
+        let interval = 300;
+
+        let full_cmd = format!("{mode}:{interval}");
+        let script = Script::from(full_cmd.as_str());
+
+        assert_eq!(script.cmd, ""); // TODO: Probably better handle this case
+        assert_eq!(script.interval, interval);
+        assert_eq!(script.mode, mode);
     }
 }