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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177

//! Terminal [`Styles`] for help and error output

pub use anstyle::*;

/// Terminal styling definitions
///
/// See also [`Command::styles`][crate::Command::styles].
///
/// # Example
///
/// clap v3 styling
/// ```rust
/// # use clap_builder as clap;
/// # use clap::builder::styling::*;
/// let styles = Styles::styled()
///     .header(AnsiColor::Yellow.on_default())
///     .usage(AnsiColor::Green.on_default())
///     .literal(AnsiColor::Green.on_default())
///     .placeholder(AnsiColor::Green.on_default());
/// ```
#[derive(Clone, Debug)]
#[allow(missing_copy_implementations)] // Large enough type that I want an explicit `clone()` for now
pub struct Styles {
    header: Style,
    error: Style,
    usage: Style,
    literal: Style,
    placeholder: Style,
    valid: Style,
    invalid: Style,
}

impl Styles {
    /// No terminal styling
    pub const fn plain() -> Self {
        Self {
            header: Style::new(),
            error: Style::new(),
            usage: Style::new(),
            literal: Style::new(),
            placeholder: Style::new(),
            valid: Style::new(),
            invalid: Style::new(),
        }
    }

    /// Default terminal styling
    pub const fn styled() -> Self {
        #[cfg(feature = "color")]
        {
            Self {
                header: Style::new().bold().underline(),
                error: Style::new()
                    .fg_color(Some(Color::Ansi(AnsiColor::Red)))
                    .bold(),
                usage: Style::new().bold().underline(),
                literal: Style::new().bold(),
                placeholder: Style::new(),
                valid: Style::new().fg_color(Some(Color::Ansi(AnsiColor::Green))),
                invalid: Style::new().fg_color(Some(Color::Ansi(AnsiColor::Yellow))),
            }
        }
        #[cfg(not(feature = "color"))]
        {
            Self::plain()
        }
    }

    /// General Heading style, e.g. [`help_heading`][crate::Arg::help_heading]
    #[inline]
    pub const fn header(mut self, style: Style) -> Self {
        self.header = style;
        self
    }

    /// Error heading
    #[inline]
    pub const fn error(mut self, style: Style) -> Self {
        self.error = style;
        self
    }

    /// Usage heading
    #[inline]
    pub const fn usage(mut self, style: Style) -> Self {
        self.usage = style;
        self
    }

    /// Literal command-line syntax, e.g. `--help`
    #[inline]
    pub const fn literal(mut self, style: Style) -> Self {
        self.literal = style;
        self
    }

    /// Descriptions within command-line syntax, e.g. [`value_name`][crate::Arg::value_name]
    #[inline]
    pub const fn placeholder(mut self, style: Style) -> Self {
        self.placeholder = style;
        self
    }

    /// Highlight suggested usage
    #[inline]
    pub const fn valid(mut self, style: Style) -> Self {
        self.valid = style;
        self
    }

    /// Highlight invalid usage
    #[inline]
    pub const fn invalid(mut self, style: Style) -> Self {
        self.invalid = style;
        self
    }
}

/// Reflection
impl Styles {
    /// General Heading style, e.g. [`help_heading`][crate::Arg::help_heading]
    #[inline(always)]
    pub const fn get_header(&self) -> &Style {
        &self.header
    }

    /// Error heading
    #[inline(always)]
    pub const fn get_error(&self) -> &Style {
        &self.error
    }

    /// Usage heading
    #[inline(always)]
    pub const fn get_usage(&self) -> &Style {
        &self.usage
    }

    /// Literal command-line syntax, e.g. `--help`
    #[inline(always)]
    pub const fn get_literal(&self) -> &Style {
        &self.literal
    }

    /// Descriptions within command-line syntax, e.g. [`value_name`][crate::Arg::value_name]
    #[inline(always)]
    pub const fn get_placeholder(&self) -> &Style {
        &self.placeholder
    }

    /// Highlight suggested usage
    #[inline(always)]
    pub const fn get_valid(&self) -> &Style {
        &self.valid
    }

    /// Highlight invalid usage
    #[inline(always)]
    pub const fn get_invalid(&self) -> &Style {
        &self.invalid
    }
}

impl super::AppExt for Styles {}

impl Default for Styles {
    fn default() -> Self {
        Self::styled()
    }
}

impl Default for &'_ Styles {
    fn default() -> Self {
        const STYLES: Styles = Styles::styled();
        &STYLES
    }
}