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

use std::fs::File;
use std::io::prelude::*;
use std::path::{Path, PathBuf};

use xdg::BaseDirectories;

use xml::reader::{EventReader, XmlEvent};

use walkdir::WalkDir;

/// Locates fontconfig config
fn get_config() -> Option<PathBuf> {
    let xdg_dirs = BaseDirectories::with_prefix("fontconfig").unwrap();
    xdg_dirs.find_config_file("fonts.conf").or_else(|| {
        let config = Path::new("/etc/fonts/fonts.conf");
        if config.exists() {
            Some(config.into())
        } else {
            None
        }
    })
}

fn parse_config(path: &Path) -> Vec<(Vec<String>, String)> {
    let config_file = File::open(path).unwrap();
    let parser = EventReader::new(config_file);
    let mut tracking_tags: Vec<String> = Vec::new();
    let mut xml_data: Vec<(Vec<String>, String)> = Vec::new();

    for e in parser {
        match e {
            Ok(XmlEvent::StartElement { name, .. }) => {
                tracking_tags.push(name.to_string());
            }
            Ok(XmlEvent::CData(data)) => {
                xml_data.push((tracking_tags.clone(), data));
            }
            Ok(XmlEvent::Characters(data)) => {
                xml_data.push((tracking_tags.clone(), data));
            }
            Ok(XmlEvent::EndElement { .. }) => {
                tracking_tags.pop();
            }
            Err(e) => panic!(e),
            _ => {}
        }
    }
    xml_data
}

/// Represents the main fontconfig config file
pub struct FontConfig {
    location: PathBuf,
    data: Vec<(Vec<String>, String)>,
}

impl FontConfig {
    /// Creates a new FontConfig object by looking for the fontconfig config file
    pub fn new() -> Result<FontConfig, ()> {
        let location = get_config().ok_or(())?;
        let data = parse_config(&location);
        Ok(FontConfig {
            location: location.to_path_buf(),
            data,
        })
    }

    /// Returns the location of the fontconfig config file being used
    pub fn get_location(&self) -> &Path {
        &self.location
    }

    /// Get the directories that contain fonts
    pub fn get_font_dirs(&self) -> Vec<PathBuf> {
        let mut dirs = Vec::new();
        for entry in &self.data {
            if entry.0.last() == Some(&"dir".to_string()) {
                let path = PathBuf::from(entry.1.clone());
                if path.exists() {
                    dirs.push(path);
                }
            }
        }
        dirs
    }

    /// Return all fonts installed on the system
    pub fn get_fonts(&self) -> Result<Vec<PathBuf>, ::std::io::Error> {
        let mut fonts = Vec::new();
        for dir in self.get_font_dirs() {
            for file in WalkDir::new(dir)
                .into_iter()
                .filter_map(|e| e.ok())
                .filter(|p| p.file_type().is_file())
            {
                let path = file.into_path();
                if let Some(extension) = path.extension() {
                    match extension.to_str() {
                        Some("ttf") | Some("otf") => fonts.push(path.clone()),
                        _ => {}
                    }
                }
            }
        }
        Ok(fonts)
    }

    /// Return all 'fonts.dir' files in font directories
    pub fn get_font_dir_files(&self) -> Result<Vec<PathBuf>, ::std::io::Error> {
        let mut fonts = Vec::new();
        for dir in self.get_font_dirs() {
            for file in WalkDir::new(dir)
                .into_iter()
                .filter_map(|e| e.ok())
                .filter(|p| p.file_type().is_file())
            {
                let path = file.into_path();
                if let Some(file_name) = path.clone().file_name() {
                    if file_name.to_str() == Some("fonts.dir") {
                        fonts.push(path);
                    }
                }
            }
        }
        Ok(fonts)
    }

    /// Returns the paths of regular fonts belonging to a specific family installed on the system
    pub fn get_regular_family_fonts(&self, family: &str) -> Result<Vec<PathBuf>, ::std::io::Error> {
        let fonts_dir_files = self.get_font_dir_files()?;
        let mut fonts: Vec<PathBuf> = Vec::new();
        for dir in fonts_dir_files {
            let mut file = ::std::fs::File::open(dir.clone()).unwrap();
            let mut buf = String::new();
            file.read_to_string(&mut buf)?;

            for line in buf.lines().filter(|l| l.find("medium-r-normal").is_some()) {
                if let Some(split) = line.find(' ') {
                    let name = line[..split].to_string();
                    let settings = line[split..].to_string();
                    let mut char_buf = String::new();
                    for c in settings.chars() {
                        if c == ' ' || c == '-' {
                            char_buf.clear()
                        } else {
                            char_buf.push(c);
                            if char_buf == family {
                                let path = dir.with_file_name(name);
                                if !fonts.contains(&path) {
                                    fonts.push(path);
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }

        Ok(fonts)
    }
}