ResourceHelper.vala

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using GLib;
using Gee;
 
public class ResourceHelper : GLib.Object {
 
    public static string resource_prefix() {
        return "/org/bastionguard/backup";
    }
 
    public static string resource_uri(string rel) {
        return "resource://" + resource_prefix() + "/" + rel;
    }
 
    public static bool resource_exists(string rel) {
        try {
            var file = File.new_for_uri(resource_uri(rel));
            return file.query_exists();
        } catch (Error e) {
            return false;
        }
    }
 
    public static Gee.ArrayList<string> base_dirs() {
        var dirs = new Gee.ArrayList<string>();
 
        string? env = Environment.get_variable("BASTIONGUARD_DATA");
        if (env != null && env.length > 0) dirs.add(env);
 
        dirs.add("/usr/share/bastionguard-backup");
        dirs.add("/usr/local/share/bastionguard-backup");
        dirs.add("/usr/share/BastionGuard/data");
        dirs.add("/usr/local/share/BastionGuard/data");
 
        string user_data = Environment.get_user_data_dir();
        dirs.add(GLib.Path.build_filename(user_data, "bastionguard-backup"));
        dirs.add(GLib.Path.build_filename(user_data, "BastionGuard", "data"));
 
        string cwd = Environment.get_current_dir();
        dirs.add(GLib.Path.build_filename(cwd, "files"));
        dirs.add(GLib.Path.build_filename(cwd, "icons"));
        dirs.add(GLib.Path.build_filename(cwd, "src", "share", "bastionguard-backup"));
        dirs.add(GLib.Path.build_filename(cwd, "src", "share", "bastionguard-backup", "images"));
        dirs.add(GLib.Path.build_filename(cwd, "src", "share", "pixmaps"));
        dirs.add(GLib.Path.build_filename(cwd, "src", "share", "icons"));
        dirs.add(GLib.Path.build_filename(cwd, "src", "share"));
        dirs.add(GLib.Path.build_filename(cwd, "share"));
        return dirs;
    }
 
    public static string? resolve_file(string rel) {
        foreach (var search_root in base_dirs()) {
            var p = GLib.Path.build_filename(search_root, rel);
            if (FileUtils.test(p, FileTest.EXISTS)) return p;
        }
        return null;
    }
 
    public static string? resolve_css(string name) {
        string[] candidates = {
            name,
            GLib.Path.build_filename("css", name),
            GLib.Path.build_filename("data", name)
        };
        foreach (var rel in candidates) {
            var p = resolve_file(rel);
            if (p != null) return p;
        }
        return null;
    }
 
    public static string? resolve_icon_file(string icon_name) {
        string[] exts = { ".png", ".svg", ".jpg", ".gif" };
        string[] rels = {
            GLib.Path.build_filename("images", icon_name),
            GLib.Path.build_filename("pixmaps", icon_name),
            GLib.Path.build_filename("icons", icon_name),
            icon_name
        };
        foreach (var rel0 in rels) {
            if (rel0.has_suffix(".png") || rel0.has_suffix(".svg") || rel0.has_suffix(".jpg") || rel0.has_suffix(".gif")) {
                var p = resolve_file(rel0);
                if (p != null) return p;
            } else {
                foreach (var ext in exts) {
                    var p = resolve_file(rel0 + ext);
                    if (p != null) return p;
                }
            }
        }
 
        string[] abs = {
            GLib.Path.build_filename("/usr/share/bastionguard-backup/images", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/bastionguard-backup/images", icon_name + ".svg"),
            GLib.Path.build_filename("/usr/local/share/bastionguard-backup/images", icon_name + ".png"),
            GLib.Path.build_filename("/usr/local/share/bastionguard-backup/images", icon_name + ".svg"),
            GLib.Path.build_filename("/usr/share/pixmaps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/local/share/pixmaps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/128x128/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/96x96/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/64x64/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/48x48/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/32x32/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/24x24/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/22x22/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/share/icons/hicolor/16x16/apps", icon_name + ".png"),
            GLib.Path.build_filename("/usr/local/share/icons/hicolor/128x128/apps", icon_name + ".png")
        };
        foreach (var p in abs) if (FileUtils.test(p, FileTest.EXISTS)) return p;
        return null;
    }
}