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

/// Extend `std::io::Write` with wincon styling
///
/// Generally, you will want to use [`Console`][crate::Console] instead
pub trait WinconStream {
    /// Change the foreground/background
    ///
    /// A common pitfall is to forget to flush writes to
    /// stdout before setting new text attributes.
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()>;

    /// Get the current foreground/background colors
    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)>;
}

impl WinconStream for std::io::Stdout {
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        inner::set_colors(self, fg, bg)
    }

    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        inner::get_colors(self)
    }
}

impl<'s> WinconStream for std::io::StdoutLock<'s> {
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        inner::set_colors(self, fg, bg)
    }

    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        inner::get_colors(self)
    }
}

impl WinconStream for std::io::Stderr {
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        inner::set_colors(self, fg, bg)
    }

    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        inner::get_colors(self)
    }
}

impl<'s> WinconStream for std::io::StderrLock<'s> {
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        inner::set_colors(self, fg, bg)
    }

    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        inner::get_colors(self)
    }
}

impl WinconStream for std::fs::File {
    fn set_colors(
        &mut self,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        ansi::set_colors(self, fg, bg)
    }

    fn get_colors(
        &self,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        ansi::get_colors(self)
    }
}

#[cfg(windows)]
mod wincon {
    use std::os::windows::io::{AsHandle, AsRawHandle};

    pub(super) fn set_colors<S: AsHandle>(
        stream: &mut S,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        let handle = stream.as_handle();
        let handle = handle.as_raw_handle();
        if let (Some(fg), Some(bg)) = (fg, bg) {
            let attributes = crate::windows::set_colors(fg, bg);
            crate::windows::set_console_text_attributes(handle, attributes)
        } else {
            Ok(())
        }
    }

    pub(super) fn get_colors<S: AsHandle>(
        stream: &S,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        let handle = stream.as_handle();
        let handle = handle.as_raw_handle();
        let info = crate::windows::get_screen_buffer_info(handle)?;
        let (fg, bg) = crate::windows::get_colors(&info);
        Ok((Some(fg), Some(bg)))
    }
}

mod ansi {
    pub(super) fn set_colors<S: std::io::Write>(
        stream: &mut S,
        fg: Option<anstyle::AnsiColor>,
        bg: Option<anstyle::AnsiColor>,
    ) -> std::io::Result<()> {
        if let Some(fg) = fg {
            write!(stream, "{}", fg.render_fg())?;
        }
        if let Some(bg) = bg {
            write!(stream, "{}", bg.render_bg())?;
        }
        if fg.is_none() && bg.is_none() {
            write!(stream, "{}", anstyle::Reset.render())?;
        }
        Ok(())
    }

    pub(super) fn get_colors<S>(
        _stream: &S,
    ) -> std::io::Result<(Option<anstyle::AnsiColor>, Option<anstyle::AnsiColor>)> {
        Ok((None, None))
    }
}

#[cfg(not(windows))]
use ansi as inner;
#[cfg(windows)]
use wincon as inner;