monolith

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//! The control protocol. Newline-delimited JSON over a unix socket, one
//! message per line, each carrying the protocol version `v`.
//!
//! Commands also have a word form, `focus left` or `spawn beer`, shared by
//! the CLI and keybindings in the config.

use serde::{Deserialize, Serialize};
use std::fmt;
use std::path::PathBuf;

pub const VERSION: u32 = 1;

/// Where the compositor serving `display` listens.
pub fn socket_path_for(display: &str) -> Option<PathBuf> {
    let dir = std::env::var_os("XDG_RUNTIME_DIR")?;
    Some(PathBuf::from(dir).join(format!("monolith-{display}.sock")))
}

/// Where a client should connect. `$MONOLITH_SOCKET`, else the socket of
/// the compositor serving `$WAYLAND_DISPLAY`.
pub fn socket_path() -> Option<PathBuf> {
    if let Some(p) = std::env::var_os("MONOLITH_SOCKET") {
        return Some(p.into());
    }
    socket_path_for(&std::env::var("WAYLAND_DISPLAY").ok()?)
}

pub use monolith_layout::{Axis, Dir};

#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, Default)]
#[serde(rename_all = "kebab-case")]
pub enum ExpandScope {
    #[default]
    Window,
    Container,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
#[serde(tag = "command", rename_all = "kebab-case", deny_unknown_fields)]
pub enum Command {
    Spawn {
        argv: Vec<String>,
    },
    Close,
    Quit,
    Reload,
    Focus {
        dir: Dir,
    },
    Move {
        dir: Dir,
    },
    MoveContainer {
        dir: Dir,
    },
    Resize {
        axis: Axis,
        delta: f64,
    },
    Expand {
        scope: ExpandScope,
    },
    /// Expands every container above the focused window towards it.
    Maximize,
    /// Makes the next window move do the opposite of the configured default,
    /// swap or merge. Again before moving cancels it.
    InvertMove,
    Flip,
    Float,
    Fullscreen,
    Sticky,
    View {
        tag: String,
    },
    ToggleView {
        tag: String,
    },
    ViewEverywhere {
        tag: String,
    },
    /// Sends the focused window to a tag.
    Tag {
        tag: String,
    },
    ReorderTag {
        tag: String,
        index: usize,
    },
    FocusOutput {
        dir: Dir,
    },
    SendToOutput {
        dir: Dir,
    },
    /// Adds the focused window to a scratchpad.
    Scratchpad {
        name: String,
    },
    Summon {
        name: String,
    },
    Dismiss {
        name: Option<String>,
    },
    /// Switches outputs on or off, all of them without a name.
    Power {
        on: bool,
        #[serde(default)]
        output: Option<String>,
    },
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ParseError(pub String);

impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&self.0)
    }
}

impl std::error::Error for ParseError {}

impl Command {
    /// Whether a bind running this still fires on a locked session, which
    /// leaves out everything that moves focus, windows or tags, and quitting.
    pub fn allowed_while_locked(&self) -> bool {
        matches!(self, Command::Spawn { .. } | Command::Reload)
    }

    /// Parses the word form, as in `["move-container", "left"]`.
    pub fn parse<S: AsRef<str>>(words: &[S]) -> Result<Self, ParseError> {
        let words: Vec<&str> = words.iter().map(AsRef::as_ref).collect();
        let Some((&name, args)) = words.split_first() else {
            return Err(ParseError("empty command".into()));
        };
        let err = |m: &str| ParseError(format!("{name}: {m}"));
        let one = || match args {
            [a] => Ok(a.to_string()),
            _ => Err(err("takes exactly one argument")),
        };
        let none = |c: Command| {
            if args.is_empty() {
                Ok(c)
            } else {
                Err(err("takes no arguments"))
            }
        };
        let dir = || -> Result<Dir, ParseError> {
            match one()?.as_str() {
                "left" | "h" => Ok(Dir::Left),
                "right" | "l" => Ok(Dir::Right),
                "up" | "k" => Ok(Dir::Up),
                "down" | "j" => Ok(Dir::Down),
                d => Err(err(&format!("unknown direction {d}"))),
            }
        };
        Ok(match name {
            "spawn" if !args.is_empty() => Command::Spawn {
                argv: args.iter().map(|a| a.to_string()).collect(),
            },
            "spawn" => return Err(err("needs a program")),
            "close" => none(Command::Close)?,
            "quit" => none(Command::Quit)?,
            "reload" => none(Command::Reload)?,
            "flip" => none(Command::Flip)?,
            "maximize" => none(Command::Maximize)?,
            "invert-move" => none(Command::InvertMove)?,
            "float" => none(Command::Float)?,
            "fullscreen" => none(Command::Fullscreen)?,
            "sticky" => none(Command::Sticky)?,
            "focus" => Command::Focus { dir: dir()? },
            "move" => Command::Move { dir: dir()? },
            "move-container" => Command::MoveContainer { dir: dir()? },
            "focus-output" => Command::FocusOutput { dir: dir()? },
            "send-to-output" => Command::SendToOutput { dir: dir()? },
            "resize" => {
                let [axis, delta] = args else {
                    return Err(err("takes an axis and a delta"));
                };
                let axis = match *axis {
                    "horizontal" | "h" => Axis::Horizontal,
                    "vertical" | "v" => Axis::Vertical,
                    a => return Err(err(&format!("unknown axis {a}"))),
                };
                let delta = delta
                    .parse()
                    .map_err(|_| err(&format!("bad delta {delta}")))?;
                Command::Resize { axis, delta }
            }
            "expand" => Command::Expand {
                scope: match args {
                    [] | ["window"] => ExpandScope::Window,
                    ["container"] => ExpandScope::Container,
                    _ => return Err(err("takes window or container")),
                },
            },
            "view" => Command::View { tag: one()? },
            "toggle-view" => Command::ToggleView { tag: one()? },
            "view-everywhere" => Command::ViewEverywhere { tag: one()? },
            "tag" => Command::Tag { tag: one()? },
            "reorder-tag" => {
                let [tag, index] = args else {
                    return Err(err("takes a tag and an index"));
                };
                let index = index
                    .parse()
                    .map_err(|_| err(&format!("bad index {index}")))?;
                Command::ReorderTag {
                    tag: tag.to_string(),
                    index,
                }
            }
            "scratchpad" => Command::Scratchpad { name: one()? },
            "summon" => Command::Summon { name: one()? },
            "dismiss" => Command::Dismiss {
                name: match args {
                    [] => None,
                    [n] => Some(n.to_string()),
                    _ => return Err(err("takes at most one name")),
                },
            },
            "power" => {
                let (on, output) = match args {
                    ["on"] => (true, None),
                    ["off"] => (false, None),
                    ["on", o] => (true, Some(o.to_string())),
                    ["off", o] => (false, Some(o.to_string())),
                    _ => return Err(err("takes on or off and optionally an output")),
                };
                Command::Power { on, output }
            }
            _ => return Err(ParseError(format!("unknown command {name}"))),
        })
    }
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
#[serde(rename_all = "kebab-case")]
pub enum Request {
    Run(Command),
    Get(Query),
    /// Streams a `State` event after every change until the client hangs up.
    Subscribe {},
}

#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq)]
#[serde(rename_all = "kebab-case")]
pub enum Query {
    State,
    Version,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
pub struct Envelope<T> {
    pub v: u32,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub id: Option<u64>,
    #[serde(flatten)]
    pub body: T,
}

impl<T> Envelope<T> {
    pub fn new(id: Option<u64>, body: T) -> Self {
        Self {
            v: VERSION,
            id,
            body,
        }
    }
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
#[serde(rename_all = "kebab-case")]
pub enum Reply {
    Ok(Option<Answer>),
    Error(String),
    Event(State),
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
#[serde(rename_all = "kebab-case")]
pub enum Answer {
    State(State),
    Version(String),
    Warnings(Vec<String>),
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Default)]
pub struct State {
    /// The next window move does the opposite of the configured default.
    pub move_inverted: bool,
    pub tags: Vec<Tag>,
    pub outputs: Vec<Output>,
    pub windows: Vec<Window>,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
pub struct Tag {
    pub name: String,
    pub urgent: bool,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
pub struct Output {
    pub name: String,
    /// x, y, width, height in logical pixels.
    pub area: [f64; 4],
    pub viewed: Vec<String>,
    pub active: bool,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
pub struct Window {
    pub id: u64,
    pub app_id: String,
    pub title: String,
    pub tag: String,
    pub output: Option<String>,
    pub floating: bool,
    pub fullscreen: bool,
    pub sticky: bool,
    pub scratchpad: Option<String>,
    pub visible: bool,
    pub focused: bool,
}

1	//! The control protocol. Newline-delimited JSON over a unix socket, one
2	//! message per line, each carrying the protocol version `v`.
3	//!
4	//! Commands also have a word form, `focus left` or `spawn beer`, shared by
5	//! the CLI and keybindings in the config.
6
7	use serde::{Deserialize, Serialize};
8	use std::fmt;
9	use std::path::PathBuf;
10
11	pub const VERSION: u32 = 1;
12
13	/// Where the compositor serving `display` listens.
14	pub fn socket_path_for(display: &str) -> Option<PathBuf> {
15	let dir = std::env::var_os("XDG_RUNTIME_DIR")?;
16	Some(PathBuf::from(dir).join(format!("monolith-{display}.sock")))
17	}
18
19	/// Where a client should connect. `$MONOLITH_SOCKET`, else the socket of
20	/// the compositor serving `$WAYLAND_DISPLAY`.
21	pub fn socket_path() -> Option<PathBuf> {
22	if let Some(p) = std::env::var_os("MONOLITH_SOCKET") {
23	return Some(p.into());
24	}
25	socket_path_for(&std::env::var("WAYLAND_DISPLAY").ok()?)
26	}
27
28	pub use monolith_layout::{Axis, Dir};
29
30	#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, Default)]
31	#[serde(rename_all = "kebab-case")]
32	pub enum ExpandScope {
33	#[default]
34	Window,
35	Container,
36	}
37
38	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
39	#[serde(tag = "command", rename_all = "kebab-case", deny_unknown_fields)]
40	pub enum Command {
41	Spawn {
42	argv: Vec<String>,
43	},
44	Close,
45	Quit,
46	Reload,
47	Focus {
48	dir: Dir,
49	},
50	Move {
51	dir: Dir,
52	},
53	MoveContainer {
54	dir: Dir,
55	},
56	Resize {
57	axis: Axis,
58	delta: f64,
59	},
60	Expand {
61	scope: ExpandScope,
62	},
63	/// Expands every container above the focused window towards it.
64	Maximize,
65	/// Makes the next window move do the opposite of the configured default,
66	/// swap or merge. Again before moving cancels it.
67	InvertMove,
68	Flip,
69	Float,
70	Fullscreen,
71	Sticky,
72	View {
73	tag: String,
74	},
75	ToggleView {
76	tag: String,
77	},
78	ViewEverywhere {
79	tag: String,
80	},
81	/// Sends the focused window to a tag.
82	Tag {
83	tag: String,
84	},
85	ReorderTag {
86	tag: String,
87	index: usize,
88	},
89	FocusOutput {
90	dir: Dir,
91	},
92	SendToOutput {
93	dir: Dir,
94	},
95	/// Adds the focused window to a scratchpad.
96	Scratchpad {
97	name: String,
98	},
99	Summon {
100	name: String,
101	},
102	Dismiss {
103	name: Option<String>,
104	},
105	/// Switches outputs on or off, all of them without a name.
106	Power {
107	on: bool,
108	#[serde(default)]
109	output: Option<String>,
110	},
111	}
112
113	#[derive(Debug, Clone, PartialEq, Eq)]
114	pub struct ParseError(pub String);
115
116	impl fmt::Display for ParseError {
117	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
118	f.write_str(&self.0)
119	}
120	}
121
122	impl std::error::Error for ParseError {}
123
124	impl Command {
125	/// Whether a bind running this still fires on a locked session, which
126	/// leaves out everything that moves focus, windows or tags, and quitting.
127	pub fn allowed_while_locked(&self) -> bool {
128	matches!(self, Command::Spawn { .. } \| Command::Reload)
129	}
130
131	/// Parses the word form, as in `["move-container", "left"]`.
132	pub fn parse<S: AsRef<str>>(words: &[S]) -> Result<Self, ParseError> {
133	let words: Vec<&str> = words.iter().map(AsRef::as_ref).collect();
134	let Some((&name, args)) = words.split_first() else {
135	return Err(ParseError("empty command".into()));
136	};
137	let err = \|m: &str\| ParseError(format!("{name}: {m}"));
138	let one = \|\| match args {
139	[a] => Ok(a.to_string()),
140	_ => Err(err("takes exactly one argument")),
141	};
142	let none = \|c: Command\| {
143	if args.is_empty() {
144	Ok(c)
145	} else {
146	Err(err("takes no arguments"))
147	}
148	};
149	let dir = \|\| -> Result<Dir, ParseError> {
150	match one()?.as_str() {
151	"left" \| "h" => Ok(Dir::Left),
152	"right" \| "l" => Ok(Dir::Right),
153	"up" \| "k" => Ok(Dir::Up),
154	"down" \| "j" => Ok(Dir::Down),
155	d => Err(err(&format!("unknown direction {d}"))),
156	}
157	};
158	Ok(match name {
159	"spawn" if !args.is_empty() => Command::Spawn {
160	argv: args.iter().map(\|a\| a.to_string()).collect(),
161	},
162	"spawn" => return Err(err("needs a program")),
163	"close" => none(Command::Close)?,
164	"quit" => none(Command::Quit)?,
165	"reload" => none(Command::Reload)?,
166	"flip" => none(Command::Flip)?,
167	"maximize" => none(Command::Maximize)?,
168	"invert-move" => none(Command::InvertMove)?,
169	"float" => none(Command::Float)?,
170	"fullscreen" => none(Command::Fullscreen)?,
171	"sticky" => none(Command::Sticky)?,
172	"focus" => Command::Focus { dir: dir()? },
173	"move" => Command::Move { dir: dir()? },
174	"move-container" => Command::MoveContainer { dir: dir()? },
175	"focus-output" => Command::FocusOutput { dir: dir()? },
176	"send-to-output" => Command::SendToOutput { dir: dir()? },
177	"resize" => {
178	let [axis, delta] = args else {
179	return Err(err("takes an axis and a delta"));
180	};
181	let axis = match *axis {
182	"horizontal" \| "h" => Axis::Horizontal,
183	"vertical" \| "v" => Axis::Vertical,
184	a => return Err(err(&format!("unknown axis {a}"))),
185	};
186	let delta = delta
187	.parse()
188	.map_err(\|_\| err(&format!("bad delta {delta}")))?;
189	Command::Resize { axis, delta }
190	}
191	"expand" => Command::Expand {
192	scope: match args {
193	[] \| ["window"] => ExpandScope::Window,
194	["container"] => ExpandScope::Container,
195	_ => return Err(err("takes window or container")),
196	},
197	},
198	"view" => Command::View { tag: one()? },
199	"toggle-view" => Command::ToggleView { tag: one()? },
200	"view-everywhere" => Command::ViewEverywhere { tag: one()? },
201	"tag" => Command::Tag { tag: one()? },
202	"reorder-tag" => {
203	let [tag, index] = args else {
204	return Err(err("takes a tag and an index"));
205	};
206	let index = index
207	.parse()
208	.map_err(\|_\| err(&format!("bad index {index}")))?;
209	Command::ReorderTag {
210	tag: tag.to_string(),
211	index,
212	}
213	}
214	"scratchpad" => Command::Scratchpad { name: one()? },
215	"summon" => Command::Summon { name: one()? },
216	"dismiss" => Command::Dismiss {
217	name: match args {
218	[] => None,
219	[n] => Some(n.to_string()),
220	_ => return Err(err("takes at most one name")),
221	},
222	},
223	"power" => {
224	let (on, output) = match args {
225	["on"] => (true, None),
226	["off"] => (false, None),
227	["on", o] => (true, Some(o.to_string())),
228	["off", o] => (false, Some(o.to_string())),
229	_ => return Err(err("takes on or off and optionally an output")),
230	};
231	Command::Power { on, output }
232	}
233	_ => return Err(ParseError(format!("unknown command {name}"))),
234	})
235	}
236	}
237
238	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
239	#[serde(rename_all = "kebab-case")]
240	pub enum Request {
241	Run(Command),
242	Get(Query),
243	/// Streams a `State` event after every change until the client hangs up.
244	Subscribe {},
245	}
246
247	#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq)]
248	#[serde(rename_all = "kebab-case")]
249	pub enum Query {
250	State,
251	Version,
252	}
253
254	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
255	pub struct Envelope<T> {
256	pub v: u32,
257	#[serde(default, skip_serializing_if = "Option::is_none")]
258	pub id: Option<u64>,
259	#[serde(flatten)]
260	pub body: T,
261	}
262
263	impl<T> Envelope<T> {
264	pub fn new(id: Option<u64>, body: T) -> Self {
265	Self {
266	v: VERSION,
267	id,
268	body,
269	}
270	}
271	}
272
273	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
274	#[serde(rename_all = "kebab-case")]
275	pub enum Reply {
276	Ok(Option<Answer>),
277	Error(String),
278	Event(State),
279	}
280
281	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
282	#[serde(rename_all = "kebab-case")]
283	pub enum Answer {
284	State(State),
285	Version(String),
286	Warnings(Vec<String>),
287	}
288
289	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Default)]
290	pub struct State {
291	/// The next window move does the opposite of the configured default.
292	pub move_inverted: bool,
293	pub tags: Vec<Tag>,
294	pub outputs: Vec<Output>,
295	pub windows: Vec<Window>,
296	}
297
298	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
299	pub struct Tag {
300	pub name: String,
301	pub urgent: bool,
302	}
303
304	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
305	pub struct Output {
306	pub name: String,
307	/// x, y, width, height in logical pixels.
308	pub area: [f64; 4],
309	pub viewed: Vec<String>,
310	pub active: bool,
311	}
312
313	#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
314	pub struct Window {
315	pub id: u64,
316	pub app_id: String,
317	pub title: String,
318	pub tag: String,
319	pub output: Option<String>,
320	pub floating: bool,
321	pub fullscreen: bool,
322	pub sticky: bool,
323	pub scratchpad: Option<String>,
324	pub visible: bool,
325	pub focused: bool,
326	}