TreeSymbol

const TreeSymbol = enum

File

Code

const TreeSymbol = enum {
    /// ├─
    tee,
    /// │
    line,
    /// └─
    langle,

    const Encoding = enum {
        ansi_escapes,
        code_page_437,
        utf8,
        ascii,
    };

    /// The escape sequence representation as a string literal
    fn escapeSeq(symbol: TreeSymbol) *const [9:0]u8 {
        return switch (symbol) {
            .tee => "\x1B\x28\x30\x74\x71\x1B\x28\x42 ",
            .line => "\x1B\x28\x30\x78\x1B\x28\x42  ",
            .langle => "\x1B\x28\x30\x6d\x71\x1B\x28\x42 ",
        };
    }

    fn bytes(symbol: TreeSymbol, encoding: Encoding) []const u8 {
        return switch (encoding) {
            .ansi_escapes => escapeSeq(symbol),
            .code_page_437 => switch (symbol) {
                .tee => "\xC3\xC4 ",
                .line => "\xB3  ",
                .langle => "\xC0\xC4 ",
            },
            .utf8 => switch (symbol) {
                .tee => "├─ ",
                .line => "│  ",
                .langle => "└─ ",
            },
            .ascii => switch (symbol) {
                .tee => "|- ",
                .line => "|  ",
                .langle => "+- ",
            },
        };
    }

    fn maxByteLen(symbol: TreeSymbol) usize {
        var max: usize = 0;
        inline for (@typeInfo(Encoding).@"enum".field_names) |field_name| {
            const len = symbol.bytes(@field(Encoding, field_name)).len;
            max = @max(max, len);
        }
        return max;
    }
}