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//! The TOML config. Parsing and validation only, the compositor applies it.

use monolith_ipc::Command;
use regex::Regex;
use serde::Deserialize;
use std::collections::BTreeMap;
use std::fmt;
use std::path::{Path, PathBuf};

pub const DEFAULT: &str = include_str!("../default.toml");

#[derive(Debug, Clone)]
pub struct Config {
    pub general: General,
    pub output: Outputs,
    pub decoration: Decoration,
    pub animation: Animation,
    pub keyboard: Keyboard,
    pub binds: Vec<Bind>,
    pub rules: Vec<Rule>,
    pub startup: Vec<Vec<String>>,
}

#[derive(Deserialize, Debug, Clone, PartialEq)]
#[serde(default, deny_unknown_fields)]
pub struct General {
    /// What `Mod` means in binds.
    #[serde(rename = "mod")]
    pub mod_key: Modifier,
    pub gaps: Gaps,
    /// What a window move does when it meets a neighbour.
    #[serde(rename = "move")]
    pub move_mode: MoveMode,
    pub focus_follows_mouse: bool,
    pub mouse_follows_focus: bool,
}

#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq, Default)]
#[serde(rename_all = "lowercase")]
pub enum MoveMode {
    /// Trade places with it.
    #[default]
    Swap,
    /// Join its lane, stacking with it if it is alone.
    Merge,
}

impl Default for General {
    fn default() -> Self {
        Self {
            mod_key: Modifier::Super,
            gaps: Gaps::default(),
            move_mode: MoveMode::Swap,
            focus_follows_mouse: false,
            mouse_follows_focus: false,
        }
    }
}

#[derive(Deserialize, Debug, Clone, Copy, PartialEq)]
#[serde(default, deny_unknown_fields)]
pub struct Gaps {
    pub inner: f64,
    pub outer: f64,
}

impl Default for Gaps {
    fn default() -> Self {
        Self {
            inner: 8.0,
            outer: 8.0,
        }
    }
}

#[derive(Deserialize, Debug, Clone, PartialEq, Default)]
#[serde(default, deny_unknown_fields)]
pub struct Outputs {
    pub vrr: Vrr,
}

#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq, Default)]
#[serde(rename_all = "lowercase")]
pub enum Vrr {
    Off,
    On,
    /// Only while a fullscreen window is shown, where a game sets the pace.
    #[default]
    Fullscreen,
}

#[derive(Deserialize, Debug, Clone, PartialEq)]
#[serde(default, deny_unknown_fields)]
pub struct Decoration {
    /// Border width in logical pixels, drawn in the gap around each window.
    pub border: u32,
    pub focused: Color,
    pub unfocused: Color,
}

impl Default for Decoration {
    fn default() -> Self {
        Self {
            border: 2,
            focused: Color::rgb(0x88, 0xbf, 0xd1),
            unfocused: Color::rgb(0x3b, 0x42, 0x52),
        }
    }
}

/// Straight RGBA from `#rrggbb` or `#rrggbbaa`.
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Color(pub [f32; 4]);

impl Color {
    pub const fn rgb(r: u8, g: u8, b: u8) -> Self {
        Self([r as f32 / 255.0, g as f32 / 255.0, b as f32 / 255.0, 1.0])
    }
}

impl<'de> Deserialize<'de> for Color {
    fn deserialize<D: serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
        let s = String::deserialize(d)?;
        let hex = s.strip_prefix('#').unwrap_or(&s);
        let bad =
            || serde::de::Error::custom(format!("bad colour {s:?}, use #rrggbb or #rrggbbaa"));
        if !matches!(hex.len(), 6 | 8) || !hex.is_ascii() {
            return Err(bad());
        }
        let mut c = [1.0f32; 4];
        for (i, v) in c.iter_mut().enumerate().take(hex.len() / 2) {
            let byte = u8::from_str_radix(&hex[i * 2..i * 2 + 2], 16).map_err(|_| bad())?;
            *v = f32::from(byte) / 255.0;
        }
        Ok(Self(c))
    }
}

#[derive(Deserialize, Debug, Clone, PartialEq)]
#[serde(default, deny_unknown_fields)]
pub struct Animation {
    pub enabled: bool,
    pub style: AnimationStyle,
    /// Every phase of a planned transition lasts this long.
    pub phase_ms: u64,
    /// A cubic bezier, as in CSS.
    pub curve: [f64; 4],
}

impl Default for Animation {
    fn default() -> Self {
        Self {
            enabled: true,
            style: AnimationStyle::Orthogonal,
            phase_ms: 160,
            curve: [0.45, 0.0, 0.2, 1.0],
        }
    }
}

#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum AnimationStyle {
    Orthogonal,
    Direct,
}

#[derive(Deserialize, Debug, Clone, PartialEq)]
#[serde(default, deny_unknown_fields)]
pub struct Keyboard {
    pub rules: String,
    pub model: String,
    pub layout: String,
    pub variant: String,
    pub options: Option<String>,
    pub repeat_delay: i32,
    pub repeat_rate: i32,
}

impl Default for Keyboard {
    fn default() -> Self {
        Self {
            rules: String::new(),
            model: String::new(),
            layout: String::new(),
            variant: String::new(),
            options: None,
            repeat_delay: 200,
            repeat_rate: 25,
        }
    }
}

#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum Modifier {
    Super,
    Alt,
    Ctrl,
    Shift,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Hash)]
pub struct Mods {
    pub logo: bool,
    pub alt: bool,
    pub ctrl: bool,
    pub shift: bool,
}

impl Mods {
    pub fn has(&self, m: Modifier) -> bool {
        match m {
            Modifier::Super => self.logo,
            Modifier::Alt => self.alt,
            Modifier::Ctrl => self.ctrl,
            Modifier::Shift => self.shift,
        }
    }

    fn set(&mut self, m: Modifier) {
        match m {
            Modifier::Super => self.logo = true,
            Modifier::Alt => self.alt = true,
            Modifier::Ctrl => self.ctrl = true,
            Modifier::Shift => self.shift = true,
        }
    }
}

#[derive(Debug, Clone, PartialEq)]
pub struct Bind {
    pub mods: Mods,
    /// An xkb keysym name, resolved by the compositor.
    pub key: String,
    pub command: Command,
}

#[derive(Debug, Clone)]
pub struct Rule {
    pub app_id: Option<Regex>,
    pub title: Option<Regex>,
    pub tag: Option<String>,
    pub output: Option<String>,
    pub floating: Option<bool>,
    pub sticky: Option<bool>,
    pub scratchpad: Option<String>,
}

/// Everything the matching rules say about a window, later rules winning.
#[derive(Debug, Clone, Default, PartialEq)]
pub struct Placement {
    pub tag: Option<String>,
    pub output: Option<String>,
    pub floating: Option<bool>,
    pub sticky: Option<bool>,
    pub scratchpad: Option<String>,
}

#[derive(Debug)]
pub enum Error {
    Io(PathBuf, std::io::Error),
    Toml(toml::de::Error),
    Bind(String, String),
    Regex(String, regex::Error),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::Io(p, e) => write!(f, "{}: {e}", p.display()),
            Error::Toml(e) => write!(f, "{e}"),
            Error::Bind(k, e) => write!(f, "bind {k:?}: {e}"),
            Error::Regex(r, e) => write!(f, "rule pattern {r:?}: {e}"),
        }
    }
}

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

#[derive(Deserialize)]
#[serde(deny_unknown_fields)]
struct Raw {
    #[serde(default)]
    startup: Vec<Vec<String>>,
    #[serde(default)]
    general: General,
    #[serde(default)]
    keyboard: Keyboard,
    #[serde(default)]
    animation: Animation,
    #[serde(default)]
    decoration: Decoration,
    #[serde(default)]
    output: Outputs,
    #[serde(default)]
    binds: BTreeMap<String, Words>,
    #[serde(default)]
    rules: Vec<RawRule>,
}

#[derive(Deserialize)]
#[serde(untagged)]
enum Words {
    Line(String),
    List(Vec<String>),
}

#[derive(Deserialize)]
#[serde(deny_unknown_fields)]
struct RawRule {
    app_id: Option<String>,
    title: Option<String>,
    tag: Option<String>,
    output: Option<String>,
    floating: Option<bool>,
    sticky: Option<bool>,
    scratchpad: Option<String>,
}

impl Config {
    /// `$MONOLITH_CONFIG`, else `$XDG_CONFIG_HOME/monolith/config.toml`.
    pub fn path() -> Option<PathBuf> {
        if let Some(p) = std::env::var_os("MONOLITH_CONFIG") {
            return Some(p.into());
        }
        let base = std::env::var_os("XDG_CONFIG_HOME")
            .map(PathBuf::from)
            .or_else(|| std::env::var_os("HOME").map(|h| PathBuf::from(h).join(".config")))?;
        Some(base.join("monolith/config.toml"))
    }

    /// Loads `path`, or the built-in default when it does not exist.
    pub fn load(path: Option<&Path>) -> Result<Self, Error> {
        match path {
            Some(p) => match std::fs::read_to_string(p) {
                Ok(text) => Self::parse(&text),
                Err(e) if e.kind() == std::io::ErrorKind::NotFound => Self::parse(DEFAULT),
                Err(e) => Err(Error::Io(p.to_owned(), e)),
            },
            None => Self::parse(DEFAULT),
        }
    }

    pub fn parse(text: &str) -> Result<Self, Error> {
        let raw: Raw = toml::from_str(text).map_err(Error::Toml)?;
        let mod_key = raw.general.mod_key;
        let binds = raw
            .binds
            .into_iter()
            .map(|(combo, words)| parse_bind(&combo, words, mod_key))
            .collect::<Result<_, _>>()?;
        let regex = |p: Option<String>| {
            p.map(|p| Regex::new(&p).map_err(|e| Error::Regex(p, e)))
                .transpose()
        };
        let rules = raw
            .rules
            .into_iter()
            .map(|r| {
                Ok(Rule {
                    app_id: regex(r.app_id)?,
                    title: regex(r.title)?,
                    tag: r.tag,
                    output: r.output,
                    floating: r.floating,
                    sticky: r.sticky,
                    scratchpad: r.scratchpad,
                })
            })
            .collect::<Result<_, Error>>()?;
        Ok(Self {
            general: raw.general,
            animation: raw.animation,
            decoration: raw.decoration,
            output: raw.output,
            keyboard: raw.keyboard,
            binds,
            rules,
            startup: raw.startup,
        })
    }

    pub fn placement(&self, app_id: &str, title: &str) -> Placement {
        let mut p = Placement::default();
        let hit = |re: &Option<Regex>, s: &str| re.as_ref().is_none_or(|re| re.is_match(s));
        for r in &self.rules {
            if !hit(&r.app_id, app_id) || !hit(&r.title, title) {
                continue;
            }
            p.tag = r.tag.clone().or(p.tag);
            p.output = r.output.clone().or(p.output);
            p.floating = r.floating.or(p.floating);
            p.sticky = r.sticky.or(p.sticky);
            p.scratchpad = r.scratchpad.clone().or(p.scratchpad);
        }
        p
    }
}

fn parse_bind(combo: &str, words: Words, mod_key: Modifier) -> Result<Bind, Error> {
    let bad = |m: String| Error::Bind(combo.to_owned(), m);
    let parts: Vec<&str> = combo.split('+').map(str::trim).collect();
    let Some((&key, mods)) = parts.split_last().filter(|(k, _)| !k.is_empty()) else {
        return Err(bad("no key".into()));
    };
    let mut set = Mods::default();
    for m in mods {
        let m = match m.to_ascii_lowercase().as_str() {
            "mod" => mod_key,
            "super" | "logo" | "win" => Modifier::Super,
            "alt" => Modifier::Alt,
            "ctrl" | "control" => Modifier::Ctrl,
            "shift" => Modifier::Shift,
            other => return Err(bad(format!("unknown modifier {other}"))),
        };
        set.set(m);
    }
    let words: Vec<String> = match words {
        Words::Line(s) => s.split_whitespace().map(str::to_owned).collect(),
        Words::List(v) => v,
    };
    let command = Command::parse(&words).map_err(|e| bad(e.0))?;
    Ok(Bind {
        mods: set,
        key: key.to_owned(),
        command,
    })
}

#[cfg(test)]
mod tests {
    use super::*;

    /// default.toml documents the defaults for users, and the Default impls
    /// apply them to sections a user config leaves out. They must agree.
    #[test]
    fn default_toml_states_the_defaults() {
        let c = Config::parse(DEFAULT).unwrap();
        assert_eq!(c.general, General::default());
        assert_eq!(c.output, Outputs::default());
        assert_eq!(c.decoration, Decoration::default());
        assert_eq!(c.animation, Animation::default());
        assert_eq!(c.keyboard, Keyboard::default());
        assert!(c.binds.len() > 40);
    }
}

1	//! The TOML config. Parsing and validation only, the compositor applies it.
2
3	use monolith_ipc::Command;
4	use regex::Regex;
5	use serde::Deserialize;
6	use std::collections::BTreeMap;
7	use std::fmt;
8	use std::path::{Path, PathBuf};
9
10	pub const DEFAULT: &str = include_str!("../default.toml");
11
12	#[derive(Debug, Clone)]
13	pub struct Config {
14	pub general: General,
15	pub output: Outputs,
16	pub decoration: Decoration,
17	pub animation: Animation,
18	pub keyboard: Keyboard,
19	pub binds: Vec<Bind>,
20	pub rules: Vec<Rule>,
21	pub startup: Vec<Vec<String>>,
22	}
23
24	#[derive(Deserialize, Debug, Clone, PartialEq)]
25	#[serde(default, deny_unknown_fields)]
26	pub struct General {
27	/// What `Mod` means in binds.
28	#[serde(rename = "mod")]
29	pub mod_key: Modifier,
30	pub gaps: Gaps,
31	/// What a window move does when it meets a neighbour.
32	#[serde(rename = "move")]
33	pub move_mode: MoveMode,
34	pub focus_follows_mouse: bool,
35	pub mouse_follows_focus: bool,
36	}
37
38	#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq, Default)]
39	#[serde(rename_all = "lowercase")]
40	pub enum MoveMode {
41	/// Trade places with it.
42	#[default]
43	Swap,
44	/// Join its lane, stacking with it if it is alone.
45	Merge,
46	}
47
48	impl Default for General {
49	fn default() -> Self {
50	Self {
51	mod_key: Modifier::Super,
52	gaps: Gaps::default(),
53	move_mode: MoveMode::Swap,
54	focus_follows_mouse: false,
55	mouse_follows_focus: false,
56	}
57	}
58	}
59
60	#[derive(Deserialize, Debug, Clone, Copy, PartialEq)]
61	#[serde(default, deny_unknown_fields)]
62	pub struct Gaps {
63	pub inner: f64,
64	pub outer: f64,
65	}
66
67	impl Default for Gaps {
68	fn default() -> Self {
69	Self {
70	inner: 8.0,
71	outer: 8.0,
72	}
73	}
74	}
75
76	#[derive(Deserialize, Debug, Clone, PartialEq, Default)]
77	#[serde(default, deny_unknown_fields)]
78	pub struct Outputs {
79	pub vrr: Vrr,
80	}
81
82	#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq, Default)]
83	#[serde(rename_all = "lowercase")]
84	pub enum Vrr {
85	Off,
86	On,
87	/// Only while a fullscreen window is shown, where a game sets the pace.
88	#[default]
89	Fullscreen,
90	}
91
92	#[derive(Deserialize, Debug, Clone, PartialEq)]
93	#[serde(default, deny_unknown_fields)]
94	pub struct Decoration {
95	/// Border width in logical pixels, drawn in the gap around each window.
96	pub border: u32,
97	pub focused: Color,
98	pub unfocused: Color,
99	}
100
101	impl Default for Decoration {
102	fn default() -> Self {
103	Self {
104	border: 2,
105	focused: Color::rgb(0x88, 0xbf, 0xd1),
106	unfocused: Color::rgb(0x3b, 0x42, 0x52),
107	}
108	}
109	}
110
111	/// Straight RGBA from `#rrggbb` or `#rrggbbaa`.
112	#[derive(Debug, Clone, Copy, PartialEq)]
113	pub struct Color(pub [f32; 4]);
114
115	impl Color {
116	pub const fn rgb(r: u8, g: u8, b: u8) -> Self {
117	Self([r as f32 / 255.0, g as f32 / 255.0, b as f32 / 255.0, 1.0])
118	}
119	}
120
121	impl<'de> Deserialize<'de> for Color {
122	fn deserialize<D: serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
123	let s = String::deserialize(d)?;
124	let hex = s.strip_prefix('#').unwrap_or(&s);
125	let bad =
126	\|\| serde::de::Error::custom(format!("bad colour {s:?}, use #rrggbb or #rrggbbaa"));
127	if !matches!(hex.len(), 6 \| 8) \|\| !hex.is_ascii() {
128	return Err(bad());
129	}
130	let mut c = [1.0f32; 4];
131	for (i, v) in c.iter_mut().enumerate().take(hex.len() / 2) {
132	let byte = u8::from_str_radix(&hex[i * 2..i * 2 + 2], 16).map_err(\|_\| bad())?;
133	*v = f32::from(byte) / 255.0;
134	}
135	Ok(Self(c))
136	}
137	}
138
139	#[derive(Deserialize, Debug, Clone, PartialEq)]
140	#[serde(default, deny_unknown_fields)]
141	pub struct Animation {
142	pub enabled: bool,
143	pub style: AnimationStyle,
144	/// Every phase of a planned transition lasts this long.
145	pub phase_ms: u64,
146	/// A cubic bezier, as in CSS.
147	pub curve: [f64; 4],
148	}
149
150	impl Default for Animation {
151	fn default() -> Self {
152	Self {
153	enabled: true,
154	style: AnimationStyle::Orthogonal,
155	phase_ms: 160,
156	curve: [0.45, 0.0, 0.2, 1.0],
157	}
158	}
159	}
160
161	#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
162	#[serde(rename_all = "lowercase")]
163	pub enum AnimationStyle {
164	Orthogonal,
165	Direct,
166	}
167
168	#[derive(Deserialize, Debug, Clone, PartialEq)]
169	#[serde(default, deny_unknown_fields)]
170	pub struct Keyboard {
171	pub rules: String,
172	pub model: String,
173	pub layout: String,
174	pub variant: String,
175	pub options: Option<String>,
176	pub repeat_delay: i32,
177	pub repeat_rate: i32,
178	}
179
180	impl Default for Keyboard {
181	fn default() -> Self {
182	Self {
183	rules: String::new(),
184	model: String::new(),
185	layout: String::new(),
186	variant: String::new(),
187	options: None,
188	repeat_delay: 200,
189	repeat_rate: 25,
190	}
191	}
192	}
193
194	#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
195	#[serde(rename_all = "lowercase")]
196	pub enum Modifier {
197	Super,
198	Alt,
199	Ctrl,
200	Shift,
201	}
202
203	#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Hash)]
204	pub struct Mods {
205	pub logo: bool,
206	pub alt: bool,
207	pub ctrl: bool,
208	pub shift: bool,
209	}
210
211	impl Mods {
212	pub fn has(&self, m: Modifier) -> bool {
213	match m {
214	Modifier::Super => self.logo,
215	Modifier::Alt => self.alt,
216	Modifier::Ctrl => self.ctrl,
217	Modifier::Shift => self.shift,
218	}
219	}
220
221	fn set(&mut self, m: Modifier) {
222	match m {
223	Modifier::Super => self.logo = true,
224	Modifier::Alt => self.alt = true,
225	Modifier::Ctrl => self.ctrl = true,
226	Modifier::Shift => self.shift = true,
227	}
228	}
229	}
230
231	#[derive(Debug, Clone, PartialEq)]
232	pub struct Bind {
233	pub mods: Mods,
234	/// An xkb keysym name, resolved by the compositor.
235	pub key: String,
236	pub command: Command,
237	}
238
239	#[derive(Debug, Clone)]
240	pub struct Rule {
241	pub app_id: Option<Regex>,
242	pub title: Option<Regex>,
243	pub tag: Option<String>,
244	pub output: Option<String>,
245	pub floating: Option<bool>,
246	pub sticky: Option<bool>,
247	pub scratchpad: Option<String>,
248	}
249
250	/// Everything the matching rules say about a window, later rules winning.
251	#[derive(Debug, Clone, Default, PartialEq)]
252	pub struct Placement {
253	pub tag: Option<String>,
254	pub output: Option<String>,
255	pub floating: Option<bool>,
256	pub sticky: Option<bool>,
257	pub scratchpad: Option<String>,
258	}
259
260	#[derive(Debug)]
261	pub enum Error {
262	Io(PathBuf, std::io::Error),
263	Toml(toml::de::Error),
264	Bind(String, String),
265	Regex(String, regex::Error),
266	}
267
268	impl fmt::Display for Error {
269	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
270	match self {
271	Error::Io(p, e) => write!(f, "{}: {e}", p.display()),
272	Error::Toml(e) => write!(f, "{e}"),
273	Error::Bind(k, e) => write!(f, "bind {k:?}: {e}"),
274	Error::Regex(r, e) => write!(f, "rule pattern {r:?}: {e}"),
275	}
276	}
277	}
278
279	impl std::error::Error for Error {}
280
281	#[derive(Deserialize)]
282	#[serde(deny_unknown_fields)]
283	struct Raw {
284	#[serde(default)]
285	startup: Vec<Vec<String>>,
286	#[serde(default)]
287	general: General,
288	#[serde(default)]
289	keyboard: Keyboard,
290	#[serde(default)]
291	animation: Animation,
292	#[serde(default)]
293	decoration: Decoration,
294	#[serde(default)]
295	output: Outputs,
296	#[serde(default)]
297	binds: BTreeMap<String, Words>,
298	#[serde(default)]
299	rules: Vec<RawRule>,
300	}
301
302	#[derive(Deserialize)]
303	#[serde(untagged)]
304	enum Words {
305	Line(String),
306	List(Vec<String>),
307	}
308
309	#[derive(Deserialize)]
310	#[serde(deny_unknown_fields)]
311	struct RawRule {
312	app_id: Option<String>,
313	title: Option<String>,
314	tag: Option<String>,
315	output: Option<String>,
316	floating: Option<bool>,
317	sticky: Option<bool>,
318	scratchpad: Option<String>,
319	}
320
321	impl Config {
322	/// `$MONOLITH_CONFIG`, else `$XDG_CONFIG_HOME/monolith/config.toml`.
323	pub fn path() -> Option<PathBuf> {
324	if let Some(p) = std::env::var_os("MONOLITH_CONFIG") {
325	return Some(p.into());
326	}
327	let base = std::env::var_os("XDG_CONFIG_HOME")
328	.map(PathBuf::from)
329	.or_else(\|\| std::env::var_os("HOME").map(\|h\| PathBuf::from(h).join(".config")))?;
330	Some(base.join("monolith/config.toml"))
331	}
332
333	/// Loads `path`, or the built-in default when it does not exist.
334	pub fn load(path: Option<&Path>) -> Result<Self, Error> {
335	match path {
336	Some(p) => match std::fs::read_to_string(p) {
337	Ok(text) => Self::parse(&text),
338	Err(e) if e.kind() == std::io::ErrorKind::NotFound => Self::parse(DEFAULT),
339	Err(e) => Err(Error::Io(p.to_owned(), e)),
340	},
341	None => Self::parse(DEFAULT),
342	}
343	}
344
345	pub fn parse(text: &str) -> Result<Self, Error> {
346	let raw: Raw = toml::from_str(text).map_err(Error::Toml)?;
347	let mod_key = raw.general.mod_key;
348	let binds = raw
349	.binds
350	.into_iter()
351	.map(\|(combo, words)\| parse_bind(&combo, words, mod_key))
352	.collect::<Result<_, _>>()?;
353	let regex = \|p: Option<String>\| {
354	p.map(\|p\| Regex::new(&p).map_err(\|e\| Error::Regex(p, e)))
355	.transpose()
356	};
357	let rules = raw
358	.rules
359	.into_iter()
360	.map(\|r\| {
361	Ok(Rule {
362	app_id: regex(r.app_id)?,
363	title: regex(r.title)?,
364	tag: r.tag,
365	output: r.output,
366	floating: r.floating,
367	sticky: r.sticky,
368	scratchpad: r.scratchpad,
369	})
370	})
371	.collect::<Result<_, Error>>()?;
372	Ok(Self {
373	general: raw.general,
374	animation: raw.animation,
375	decoration: raw.decoration,
376	output: raw.output,
377	keyboard: raw.keyboard,
378	binds,
379	rules,
380	startup: raw.startup,
381	})
382	}
383
384	pub fn placement(&self, app_id: &str, title: &str) -> Placement {
385	let mut p = Placement::default();
386	let hit = \|re: &Option<Regex>, s: &str\| re.as_ref().is_none_or(\|re\| re.is_match(s));
387	for r in &self.rules {
388	if !hit(&r.app_id, app_id) \|\| !hit(&r.title, title) {
389	continue;
390	}
391	p.tag = r.tag.clone().or(p.tag);
392	p.output = r.output.clone().or(p.output);
393	p.floating = r.floating.or(p.floating);
394	p.sticky = r.sticky.or(p.sticky);
395	p.scratchpad = r.scratchpad.clone().or(p.scratchpad);
396	}
397	p
398	}
399	}
400
401	fn parse_bind(combo: &str, words: Words, mod_key: Modifier) -> Result<Bind, Error> {
402	let bad = \|m: String\| Error::Bind(combo.to_owned(), m);
403	let parts: Vec<&str> = combo.split('+').map(str::trim).collect();
404	let Some((&key, mods)) = parts.split_last().filter(\|(k, _)\| !k.is_empty()) else {
405	return Err(bad("no key".into()));
406	};
407	let mut set = Mods::default();
408	for m in mods {
409	let m = match m.to_ascii_lowercase().as_str() {
410	"mod" => mod_key,
411	"super" \| "logo" \| "win" => Modifier::Super,
412	"alt" => Modifier::Alt,
413	"ctrl" \| "control" => Modifier::Ctrl,
414	"shift" => Modifier::Shift,
415	other => return Err(bad(format!("unknown modifier {other}"))),
416	};
417	set.set(m);
418	}
419	let words: Vec<String> = match words {
420	Words::Line(s) => s.split_whitespace().map(str::to_owned).collect(),
421	Words::List(v) => v,
422	};
423	let command = Command::parse(&words).map_err(\|e\| bad(e.0))?;
424	Ok(Bind {
425	mods: set,
426	key: key.to_owned(),
427	command,
428	})
429	}
430
431	#[cfg(test)]
432	mod tests {
433	use super::*;
434
435	/// default.toml documents the defaults for users, and the Default impls
436	/// apply them to sections a user config leaves out. They must agree.
437	#[test]
438	fn default_toml_states_the_defaults() {
439	let c = Config::parse(DEFAULT).unwrap();
440	assert_eq!(c.general, General::default());
441	assert_eq!(c.output, Outputs::default());
442	assert_eq!(c.decoration, Decoration::default());
443	assert_eq!(c.animation, Animation::default());
444	assert_eq!(c.keyboard, Keyboard::default());
445	assert!(c.binds.len() > 40);
446	}
447	}