tuika 0.2.0

A composable terminal UI toolkit — flexbox layout, overlays, focus, and safe ratatui interoperability.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

//! `view!` — a declarative macro layer over the `tuika` builder API.
//!
//! `view!` is pure sugar: every rule expands to the same `Flex`/`Boxed`/
//! `element(...)` calls you would write by hand, so there is no runtime cost,
//! no reconciler, and nothing new to learn about the model. It exists to make
//! nested layouts read top-down instead of inside-out.
//!
//! ```ignore
//! let root = view! {
//!     col(gap = 1, padding = tuika::Padding::all(1)) {
//!         boxed(title = " body ") { text("hello") }
//!         grow(1) { spacer() }
//!         node(my_status_bar)      // any expression that is `impl View`
//!     }
//! };
//! ```
//!
//! Grammar (each keyword consumes exactly one node):
//! - `col( attrs ) { children }` / `row( attrs ) { children }` — flex containers.
//!   Attrs: `gap = e`, `padding = e`, `align = e`, `justify = e` (comma-separated,
//!   all optional; the whole `( … )` may be omitted).
//! - `boxed( attrs ) { child }` — bordered container of one child.
//!   Attrs: `title = e`, `border = e`, `padding = e`, `background = e`.
//! - `text( expr )` — a `Text::raw` line. `spacer()` — a `Spacer`.
//! - `grow(n) { node }` / `fixed(n) { node }` — set a child's main-axis size
//!   (default is auto).
//! - `node( expr )` — **escape hatch**: splice any `impl View`, including a
//!   component defined in another crate. This is how third-party components
//!   plug into the DSL today.
//!
//! Cross-crate note: the macro emits `$crate::…` paths and is
//! `#[macro_export]`ed, so downstream crates use it as `tuika::view!` without
//! importing the referenced types. A future proc-macro could add first-class
//! `MyWidget { … }` syntax for external components; the `node(expr)` escape
//! hatch covers that case today.

#[macro_export]
macro_rules! view {
    // ---- public entry: a single node -> Element -----------------------------
    (col $($rest:tt)*) => { $crate::view!(@one col $($rest)*) };
    (row $($rest:tt)*) => { $crate::view!(@one row $($rest)*) };
    (boxed $($rest:tt)*) => { $crate::view!(@one boxed $($rest)*) };
    (text $($rest:tt)*) => { $crate::view!(@one text $($rest)*) };
    (spacer $($rest:tt)*) => { $crate::view!(@one spacer $($rest)*) };
    (node $($rest:tt)*) => { $crate::view!(@one node $($rest)*) };

    // ---- @one: parse one node into an Element -------------------------------
    (@one col $(( $($attr:tt)* ))? { $($kids:tt)* }) => {{
        let __flex = $crate::Flex::column();
        let __flex = $crate::view!(@attrs __flex; $($($attr)*)?);
        let __flex = $crate::view!(@kids __flex; $($kids)*);
        $crate::element(__flex)
    }};
    (@one row $(( $($attr:tt)* ))? { $($kids:tt)* }) => {{
        let __flex = $crate::Flex::row();
        let __flex = $crate::view!(@attrs __flex; $($($attr)*)?);
        let __flex = $crate::view!(@kids __flex; $($kids)*);
        $crate::element(__flex)
    }};
    (@one boxed $(( $($attr:tt)* ))? { $($kids:tt)* }) => {{
        let __boxed = $crate::Boxed::new($crate::view!(@one $($kids)*));
        let __boxed = $crate::view!(@boxattrs __boxed; $($($attr)*)?);
        $crate::element(__boxed)
    }};
    (@one text ( $e:expr )) => {
        $crate::element($crate::Text::raw($e))
    };
    (@one spacer ()) => { $crate::element($crate::Spacer) };
    (@one node ( $e:expr )) => { $crate::element($e) };

    // ---- @kids: fold children onto a Flex builder ---------------------------
    (@kids $b:expr; ) => { $b };
    (@kids $b:expr; grow ( $n:expr ) { $($node:tt)* } $($rest:tt)*) => {
        $crate::view!(@kids $b.grow($n, $crate::view!(@one $($node)*)); $($rest)*)
    };
    (@kids $b:expr; fixed ( $n:expr ) { $($node:tt)* } $($rest:tt)*) => {
        $crate::view!(@kids $b.fixed($n, $crate::view!(@one $($node)*)); $($rest)*)
    };
    (@kids $b:expr; col $(( $($a:tt)* ))? { $($k:tt)* } $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::view!(@one col $(($($a)*))? { $($k)* })); $($rest)*)
    };
    (@kids $b:expr; row $(( $($a:tt)* ))? { $($k:tt)* } $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::view!(@one row $(($($a)*))? { $($k)* })); $($rest)*)
    };
    (@kids $b:expr; boxed $(( $($a:tt)* ))? { $($k:tt)* } $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::view!(@one boxed $(($($a)*))? { $($k)* })); $($rest)*)
    };
    (@kids $b:expr; text ( $e:expr ) $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::element($crate::Text::raw($e))); $($rest)*)
    };
    (@kids $b:expr; spacer () $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::element($crate::Spacer)); $($rest)*)
    };
    (@kids $b:expr; node ( $e:expr ) $($rest:tt)*) => {
        $crate::view!(@kids $b.auto($crate::element($e)); $($rest)*)
    };

    // ---- @attrs: fold flex layout attributes --------------------------------
    (@attrs $b:expr; ) => { $b };
    (@attrs $b:expr; gap = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@attrs $b.gap($e); $($($rest)*)?)
    };
    (@attrs $b:expr; padding = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@attrs $b.padding($e); $($($rest)*)?)
    };
    (@attrs $b:expr; align = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@attrs $b.align($e); $($($rest)*)?)
    };
    (@attrs $b:expr; justify = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@attrs $b.justify($e); $($($rest)*)?)
    };
    (@attrs $b:expr; background = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@attrs $b.background($e); $($($rest)*)?)
    };

    // ---- @boxattrs: fold boxed attributes -----------------------------------
    (@boxattrs $b:expr; ) => { $b };
    (@boxattrs $b:expr; title = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@boxattrs $b.title($e); $($($rest)*)?)
    };
    (@boxattrs $b:expr; border = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@boxattrs $b.border($e); $($($rest)*)?)
    };
    (@boxattrs $b:expr; padding = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@boxattrs $b.padding($e); $($($rest)*)?)
    };
    (@boxattrs $b:expr; background = $e:expr $(, $($rest:tt)*)?) => {
        $crate::view!(@boxattrs $b.background($e); $($($rest)*)?)
    };
}