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const z = @import( "std" );
const folders = @import( "known_folders" );
var gpa = z.heap.GeneralPurposeAllocator( .{ .thread_safe = true } ){};
const alloc = gpa.allocator();
const bufprint = z.fmt.bufPrint;
const allocprint = z.fmt.allocPrint;
const ArrayList = z.ArrayList;
var paths = [_][]const u8{
"~/.local/share/applications",
"/usr/share/applications",
"/usr/local/share/applications",
};
const FsEntry = struct {
fn deinit( s: *const FsEntry ) void {
alloc.free( s.path );
alloc.free( s.name );
}
path: []const u8,
name: []const u8,
is_dir: bool
};
const XdgEntry = struct {
fn deinit( s: *const XdgEntry ) void {
alloc.free( s.path );
alloc.free( s.name );
alloc.free( s.desc );
alloc.free( s.exec );
}
path: []const u8,
name: []const u8,
desc: []const u8,
exec: []const u8,
};
pub fn checkSymlink( path: []const u8 ) !void {
const link_path_buf = try alloc.alloc( u8, z.fs.max_path_bytes );
var link_path = try z.fs.readLinkAbsolute( path, link_path_buf[0..z.fs.max_path_bytes] );
const is_abs = z.fs.path.isAbsolute( link_path );
if( !is_abs )
link_path = try z.fs.path.resolve( alloc, &[_][]const u8{ path, "..", link_path } );
defer if( !is_abs ) alloc.free( link_path );
const f = try z.fs.openFileAbsolute( link_path, .{} );
defer f.close();
const meta = try f.metadata();
if( meta.kind() != .file )
return error.NotAFile;
}
pub fn openDir( path: []const u8 ) !ArrayList( FsEntry ) {
var handle = try z.fs.openDirAbsolute( path, .{ .iterate = true, .no_follow = false } );
defer handle.close();
var list = ArrayList( FsEntry ).init( alloc );
var iter = handle.iterate();
while( try iter.next() ) |entry| {
if( !z.mem.endsWith( u8, entry.name, ".desktop" ) )
continue;
const path_buf = try alloc.alloc( u8, entry.name.len + path.len + 1 );
const name = try alloc.dupe( u8, entry.name );
const entry_path = try bufprint( path_buf, "{s}/{s}", .{path, entry.name} );
if( entry.kind == .sym_link ) {
checkSymlink( entry_path ) catch continue;
}
const fs_entry = FsEntry{
.name = name,
.path = entry_path,
.is_dir = entry.kind == .directory
};
list.append( fs_entry ) catch {};
}
return list;
}
pub fn parseXDGEntry( contents: []const u8, path: []const u8 ) !XdgEntry {
var i: u32 = 0;
var s: u32 = 0;
var name: ?[]const u8 = null;
var exec: ?[]const u8 = null;
var desc: ?[]const u8 = null;
for( contents ) |c| {
if( c == '\n' ) {
const line = contents[s..i];
if( name == null ) {
if( z.mem.startsWith( u8, line, "Name=" ) )
name = try alloc.dupe( u8, line[5..line.len] );
}
if( exec == null ) {
if( z.mem.startsWith( u8, line, "Exec=" ) )
exec = try alloc.dupe( u8, line[5..line.len] );
}
if( desc == null ) {
if( z.mem.startsWith( u8, line, "Comment=" ) )
desc = try alloc.dupe( u8, line[8..i-s] );
}
s = i + 1;
}
i += 1;
}
errdefer {
if( name != null ) alloc.free( name.? );
if( exec != null ) alloc.free( exec.? );
if( desc != null ) alloc.free( desc.? );
}
if( name == null or exec == null or name.?.len == 0 or exec.?.len == 0 )
return error.InvalidEntry;
if( desc == null )
desc = "";
return XdgEntry {
.name = name.?,
.exec = exec.?,
.desc = desc.?,
.path = try alloc.dupe( u8, path )
};
}
pub fn parseXDGEntries( entries: ArrayList( FsEntry ) ) !ArrayList( XdgEntry ) {
var list = ArrayList( XdgEntry ).init( alloc );
for( entries.items ) |entry| {
if( entry.is_dir )
continue;
var handle = try z.fs.openFileAbsolute( entry.path, .{} );
defer handle.close();
var reader = handle.reader();
const buf = try reader.readAllAlloc(alloc, 999999);
defer alloc.free( buf );
const xdg = parseXDGEntry( buf, entry.path ) catch continue;
try list.append( xdg );
}
return list;
}
pub fn main() !void {
var all_entries = ArrayList( XdgEntry ).init( alloc );
for( paths ) |path| {
var line = path;
var free_path = false;
const idx = z.mem.indexOf( u8, path, "~" );
if( idx ) |i| {
const home = try folders.getPath( alloc, .home );
if( home == null )
return error.NoHome;
line = try allocprint( alloc, "{s}{s}", .{ home.?, line[i+1..] } );
alloc.free( home.? );
free_path = true;
}
defer { if( free_path ) alloc.free( line ); }
const entries = try openDir( line );
defer {
for( entries.items ) |e|
e.deinit();
entries.deinit();
}
const list = try parseXDGEntries( entries );
try all_entries.appendSlice( list.items );
list.deinit();
}
for( all_entries.items ) |e| {
if( e.desc.len > 0 ) {
try z.io.getStdOut().writer().print( "{s} - {s} | {s}\n", .{ e.name, e.desc, e.path } );
} else
try z.io.getStdOut().writer().print( "{s} | {s}\n", .{ e.name, e.path } );
e.deinit();
}
all_entries.deinit();
_ = gpa.deinit();
}
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