/// <summary>Read the database for the specified terminal.</summary>
/// <param name="term">The identifier for the terminal.</param>
/// <returns>The database, or null if it could not be found.</returns>
private static Database ReadDatabase(string term)
{
// This follows the same search order as prescribed by ncurses.
Database db;
// First try a location specified in the TERMINFO environment variable.
string terminfo = Environment.GetEnvironmentVariable("TERMINFO");
if (!string.IsNullOrWhiteSpace(terminfo) && (db = ReadDatabase(term, terminfo)) != null)
{
return(db);
}
// Then try in the user's home directory.
string home = PersistedFiles.GetHomeDirectory();
if (!string.IsNullOrWhiteSpace(home) && (db = ReadDatabase(term, home + "/.terminfo")) != null)
{
return(db);
}
// Then try a set of well-known locations.
foreach (string terminfoLocation in _terminfoLocations)
{
if ((db = ReadDatabase(term, terminfoLocation)) != null)
{
return(db);
}
}
// Couldn't find one
return(null);
}
private static string GetFolderPathCoreWithoutValidation(SpecialFolder folder)
{
// First handle any paths that involve only static paths, avoiding the overheads of getting user-local paths.
// https://www.freedesktop.org/software/systemd/man/file-hierarchy.html
switch (folder)
{
case SpecialFolder.CommonApplicationData: return("/usr/share");
case SpecialFolder.CommonTemplates: return("/usr/share/templates");
}
if (IsMac)
{
switch (folder)
{
case SpecialFolder.ProgramFiles: return("/Applications");
case SpecialFolder.System: return("/System");
}
}
// All other paths are based on the XDG Base Directory Specification:
// https://specifications.freedesktop.org/basedir-spec/latest/
string home = null;
try
{
home = PersistedFiles.GetHomeDirectory();
}
catch (Exception exc)
{
Debug.Fail($"Unable to get home directory: {exc}");
}
if (string.IsNullOrEmpty(home))
{
home = Path.GetTempPath();
}
// TODO: Consider caching (or precomputing and caching) all subsequent results.
// This would significantly improve performance for repeated access, at the expense
// of not being responsive to changes in the underlying environment variables,
// configuration files, etc.
switch (folder)
{
case SpecialFolder.UserProfile:
case SpecialFolder.MyDocuments: // same value as Personal
return(home);
case SpecialFolder.ApplicationData:
return(GetXdgConfig(home));
case SpecialFolder.LocalApplicationData:
// "$XDG_DATA_HOME defines the base directory relative to which user specific data files should be stored."
// "If $XDG_DATA_HOME is either not set or empty, a default equal to $HOME/.local/share should be used."
string data = GetEnvironmentVariable("XDG_DATA_HOME");
if (string.IsNullOrEmpty(data) || data[0] != '/')
{
data = Path.Combine(home, ".local", "share");
}
return(data);
case SpecialFolder.Desktop:
case SpecialFolder.DesktopDirectory:
return(ReadXdgDirectory(home, "XDG_DESKTOP_DIR", "Desktop"));
case SpecialFolder.Templates:
return(ReadXdgDirectory(home, "XDG_TEMPLATES_DIR", "Templates"));
case SpecialFolder.MyVideos:
return(ReadXdgDirectory(home, "XDG_VIDEOS_DIR", "Videos"));
case SpecialFolder.MyMusic:
return(IsMac ? Path.Combine(home, "Music") : ReadXdgDirectory(home, "XDG_MUSIC_DIR", "Music"));
case SpecialFolder.MyPictures:
return(IsMac ? Path.Combine(home, "Pictures") : ReadXdgDirectory(home, "XDG_PICTURES_DIR", "Pictures"));
case SpecialFolder.Fonts:
return(IsMac ? Path.Combine(home, "Library", "Fonts") : Path.Combine(home, ".fonts"));
case SpecialFolder.Favorites:
if (IsMac)
{
return(Path.Combine(home, "Library", "Favorites"));
}
break;
case SpecialFolder.InternetCache:
if (IsMac)
{
return(Path.Combine(home, "Library", "Caches"));
}
break;
}
// No known path for the SpecialFolder
return(string.Empty);
}
private static string?GetSpecialFolder(SpecialFolder folder)
{
string?home = null;
try
{
home = PersistedFiles.GetHomeDirectory();
}
catch (Exception exc)
{
Debug.Fail($"Unable to get home directory: {exc}");
}
// Fall back to '/' when we can't determine the home directory.
// This location isn't writable by non-root users which provides some safeguard
// that the application doesn't write data which is meant to be private.
if (string.IsNullOrEmpty(home))
{
home = "/";
}
switch (folder)
{
case SpecialFolder.Personal:
case SpecialFolder.LocalApplicationData:
return(home);
case SpecialFolder.ApplicationData:
return(Path.Combine(home, ".config"));
case SpecialFolder.Desktop:
case SpecialFolder.DesktopDirectory:
return(Path.Combine(home, "Desktop"));
case SpecialFolder.MyMusic:
return(Path.Combine(home, "Music"));
case SpecialFolder.MyPictures:
return(Path.Combine(home, "Pictures"));
case SpecialFolder.Templates:
return(Path.Combine(home, "Templates"));
case SpecialFolder.MyVideos:
return(Path.Combine(home, "Videos"));
case SpecialFolder.CommonTemplates:
return("/usr/share/templates");
case SpecialFolder.Fonts:
return(Path.Combine(home, ".fonts"));
case SpecialFolder.UserProfile:
return(GetEnvironmentVariable("HOME"));
case SpecialFolder.CommonApplicationData:
return("/usr/share");
default:
return(string.Empty);
}
}
