electron_tasje 0.7.5

use anyhow::{anyhow, Result};
use std::fs;
use std::path::Path;

use crate::app::App;
use crate::environment::Platform;

pub struct DesktopGenerator {
    entries: Vec<(String, String)>,
}

impl DesktopGenerator {
    #[allow(clippy::new_without_default)]
    pub fn new() -> Self {
        Self {
            entries: Vec::new(),
        }
    }

    fn add_entry<K, V>(&mut self, key: K, val: V)
    where
        K: AsRef<str>,
        V: AsRef<str>,
    {
        self.entries
            .push((String::from(key.as_ref()), String::from(val.as_ref())));
    }

    /// https://www.freedesktop.org/wiki/Specifications/desktop-entry-spec/
    pub fn generate(mut self, app: &App, platform: Platform) -> Result<String> {
        let exec_name = app.executable_name(platform)?;

        self.add_entry("Name", app.product_name(platform));
        self.add_entry("Exec", format!("/usr/bin/{} %U", exec_name));
        self.add_entry("Terminal", "false");
        self.add_entry("Type", "Application");
        self.add_entry("Icon", exec_name);
        if let Some(properties) = app.config().desktop_properties(platform) {
            // order might and will be random. serde_json has `preserve_order` feature,
            // but then EBuilderConfig internally parses it into a HashMap.
            // also the config format might not be json.
            for (key, val) in properties {
                self.add_entry(key, val);
            }
        }
        if let Some(comment) = app.description(platform) {
            self.add_entry("Comment", comment);
        }

        let mut mimes = vec![];
        for protocol in app.config().protocol_associations(platform) {
            for scheme in &protocol.schemes {
                mimes.push(format!("x-scheme-handler/{}", scheme));
            }
        }
        for file_ass in app.config().file_associations(platform) {
            if let Some(mime_type) = &file_ass.mime_type {
                mimes.push(mime_type.clone());
            }
        }
        if !mimes.is_empty() {
            self.add_entry("MimeType", mimes.join(";"));
        }

        let categories = app.config().desktop_categories(platform);
        if !categories.is_empty() {
            self.add_entry("Categories", categories.join(";"));
        }

        let mut contents = String::from("[Desktop Entry]\n");
        for (key, val) in self.entries {
            contents.push_str(&format!("{key}={val}\n"));
        }

        Ok(contents)
    }

    pub fn write_to_output_dir<P>(
        self,
        app: &App,
        platform: Platform,
        output: Option<P>,
    ) -> Result<()>
    where
        P: AsRef<Path>,
    {
        let contents = self.generate(app, platform)?;
        let mut target = app.output_dir(platform);
        if let Some(out) = output {
            target = target.join(out.as_ref());
            if target.is_dir() {
                target = target.join(app.desktop_name(platform)?);
            }
        } else {
            target = target.join(app.desktop_name(platform)?);
        }

        // make sure dir exists
        fs::create_dir_all(
            target
                .parent()
                .ok_or_else(|| anyhow!("no desktop entry target parent"))?,
        )?;
        fs::write(target, contents)?;

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::DesktopGenerator;
    use crate::app::App;
    use crate::environment::Platform;
    use anyhow::Result;

    static LINUX: Platform = Platform::Linux;

    #[test]
    fn test_gen_desktop() -> Result<()> {
        let app: App = App::new_from_package_file("test_assets/package.json")?;

        let generator = DesktopGenerator::new();

        assert_eq!(
            generator.generate(&app, LINUX)?,
            r#"[Desktop Entry]
Name=Tasje
Exec=/usr/bin/tasje %U
Terminal=false
Type=Application
Icon=tasje
CustomField=custom_value
Comment=Packs Electron apps
MimeType=x-scheme-handler/tasje;x-scheme-handler/ebuilder;x-scheme-handler/electron-builder;application/x-tas
Categories=Tools
"#
        );

        Ok(())
    }
}