fontu 0.2.0

Bitmap font converter
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

// fonto: Program to convert between font formats
#![forbid(unsafe_code)]

use anyhow::Result;
use argh::FromArgs;
use std::io::{IsTerminal, Read, stdin, stdout};
use tfon::Prop;

/// Command-line arguments
#[derive(FromArgs, PartialEq, Debug)]
struct Args {
    #[argh(subcommand)]
    cmd: Command,
}

/// Sub-commands
#[derive(FromArgs, PartialEq, Debug)]
#[argh(subcommand)]
enum Command {
    Ifnt(IfntCommand),
    Tfon(TfonCommand),
}

/// convert font to ifnt format
#[derive(Clone, Copy, FromArgs, PartialEq, Debug)]
#[argh(subcommand, name = "ifnt")]
struct IfntCommand {}

/// convert font to tfon format
#[derive(Clone, Copy, FromArgs, PartialEq, Debug)]
#[argh(subcommand, name = "tfon")]
struct TfonCommand {}

/// Example font property iterator
#[derive(Clone, Debug)]
struct PropIter<'a> {
    pos: u16,
    #[allow(dead_code)]
    buf: &'a str,
}

impl<'a> Iterator for PropIter<'a> {
    type Item = Prop<'a>;

    fn next(&mut self) -> Option<Self::Item> {
        let pos = self.pos;
        self.pos += 1;
        match pos {
            0 => Some(Prop::FontName("Example Font")),
            1 => Some(Prop::FontNumber(1)),
            2 => Some(Prop::CharSpacing(1)),
            3 => Some(Prop::LineSpacing(1)),
            p if p < 256 + 3 => Some(Prop::CodePoint(p - 3)),
            _ => None,
        }
    }
}

impl<'a> PropIter<'a> {
    /// Create a new example font property iterator
    fn new(buf: &'a str) -> Self {
        PropIter { pos: 0, buf }
    }
}

impl IfntCommand {
    fn convert(self) -> Result<()> {
        let mut buf = String::with_capacity(1024);
        tfon::ifnt::write(stdout(), font_properties(&mut buf)?.into_iter())?;
        Ok(())
    }
}

impl TfonCommand {
    fn convert(self) -> Result<()> {
        let mut buf = String::with_capacity(1024);
        tfon::tfon::write(stdout(), font_properties(&mut buf)?.into_iter())?;
        Ok(())
    }
}

/// Create a vec of font properties
fn font_properties(buf: &mut String) -> Result<Vec<Prop>> {
    if stdin().is_terminal() {
        Ok(PropIter::new(buf).collect())
    } else {
        stdin().read_to_string(buf)?;
        // What format is this font?
        if buf.starts_with("STARTFONT") {
            Ok(tfon::bdf::Parser::new(buf).collect())
        } else if buf.starts_with("[FontInfo]") {
            Ok(tfon::ifnt::Parser::new(buf).collect())
        } else if buf.starts_with("name: ") {
            Ok(tfon::ifntx::Parser::new(buf).collect())
        } else if buf.starts_with("font_name: ") {
            Ok(tfon::tfon::Parser::new(buf).collect())
        } else {
            Err(tfon::Error::UnknownFormat())?
        }
    }
}

impl Args {
    /// Run selected command
    fn run(self) -> Result<()> {
        match &self.cmd {
            Command::Ifnt(ifnt) => ifnt.convert(),
            Command::Tfon(tfon) => tfon.convert(),
        }
    }
}

/// Program entry point
fn main() -> Result<()> {
    let args: Args = argh::from_env();
    args.run()?;
    Ok(())
}