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const std = @import("std");
pub const Key = enum(u16) {
tab = 0x09,
return_ = 0x0d,
escape = 0x1b,
space = 0x20,
backspace = 0x7f,
max_char = 0xff,
up,
down,
right,
left,
end,
home,
untab,
insert,
delete,
page_up,
page_down,
mod_shft = 0x1000,
mod_meta = 0x2000,
mod_ctrl = 0x4000,
_,
pub fn char(ch: u8) Key {
return @enumFromInt(ch);
}
pub fn shift(k: anytype) Key {
return Key.mod(.mod_shft, Key.ify(k));
}
pub fn meta(k: anytype) Key {
return Key.mod(.mod_meta, Key.ify(k));
}
pub fn ctrl(k: anytype) Key {
return Key.mod(.mod_ctrl, Key.ify(k));
}
/// Key.ify == Keyify :)
fn ify(k: anytype) Key {
return switch (@TypeOf(k)) {
comptime_int, u8 => Key.char(k),
Key => k,
else => unreachable,
};
}
fn mod(comptime modifier: Key, k: Key) Key {
comptime std.debug.assert(modifier == .mod_shft or modifier == .mod_meta or modifier == .mod_ctrl);
const shft_int = @intFromEnum(Key.mod_shft);
const meta_int = @intFromEnum(Key.mod_meta);
const ctrl_int = @intFromEnum(Key.mod_ctrl);
const max_char_int = @intFromEnum(Key.max_char);
const mod_int = @intFromEnum(modifier);
const k_int = @intFromEnum(k);
if (k_int & mod_int == mod_int) {
return k;
}
const k_origmod = k_int & (shft_int | meta_int | ctrl_int);
const k_nomod = k_int & ~k_origmod;
if (k_nomod <= max_char_int) {
// Appending S- to a character is not smart
std.debug.assert(modifier != .mod_shft);
return switch (modifier) {
.mod_meta => @enumFromInt(k_int | meta_int),
.mod_ctrl => @enumFromInt(k_origmod | (k_nomod & 0x1f)),
else => unreachable,
};
} else {
return @enumFromInt(k_int | mod_int);
}
}
pub fn format(
key: Key,
comptime fmt: []const u8,
options: std.fmt.FormatOptions,
writer: anytype,
) @TypeOf(writer).Error!void {
comptime if (fmt.len != 0) {
@compileError("Key doesn't support {" ++ fmt ++ "} format");
};
return switch (key) {
.tab => std.fmt.formatBuf("<tab>", options, writer),
.return_ => std.fmt.formatBuf("<return>", options, writer),
.escape => std.fmt.formatBuf("<escape>", options, writer),
.space => std.fmt.formatBuf("<space>", options, writer),
.backspace => std.fmt.formatBuf("<backspace>", options, writer),
.max_char => key.formatGeneric(options, writer),
.up => std.fmt.formatBuf("<up>", options, writer),
.down => std.fmt.formatBuf("<down>", options, writer),
.right => std.fmt.formatBuf("<right>", options, writer),
.left => std.fmt.formatBuf("<left>", options, writer),
.end => std.fmt.formatBuf("<end>", options, writer),
.home => std.fmt.formatBuf("<home>", options, writer),
.untab => std.fmt.formatBuf("<untab>", options, writer),
.insert => std.fmt.formatBuf("<insert>", options, writer),
.delete => std.fmt.formatBuf("<delete>", options, writer),
.page_up => std.fmt.formatBuf("<page-up>", options, writer),
.page_down => std.fmt.formatBuf("<page-down>", options, writer),
.mod_shft, .mod_meta, .mod_ctrl => key.formatGeneric(options, writer),
_ => key.formatGeneric(options, writer),
};
}
fn formatGeneric(
key: Key,
options: std.fmt.FormatOptions,
writer: anytype,
) @TypeOf(writer).Error!void {
const shft_int = @intFromEnum(Key.mod_shft);
const meta_int = @intFromEnum(Key.mod_meta);
const ctrl_int = @intFromEnum(Key.mod_ctrl);
const key_int = @intFromEnum(key);
if (key_int & shft_int == shft_int) {
try std.fmt.formatBuf("S-", options, writer);
return Key.format(
@enumFromInt(key_int & ~shft_int),
"",
options,
writer,
);
} else if (key_int & meta_int == meta_int) {
try std.fmt.formatBuf("M-", options, writer);
return Key.format(
@enumFromInt(key_int & ~meta_int),
"",
options,
writer,
);
} else if (key_int & ctrl_int == ctrl_int) {
try std.fmt.formatBuf("C-", options, writer);
return Key.format(
@enumFromInt(key_int & ~ctrl_int),
"",
options,
writer,
);
} else if (key_int < 0x20) {
try std.fmt.formatBuf("C-", options, writer);
return Key.format(Key.char(@intCast(key_int + 0x40)), "", options, writer);
} else if (key_int < 0x100) {
const ch: u8 = @intCast(key_int);
if (std.ascii.isPrint(ch)) {
return writer.writeByte(ch);
} else {
try writer.writeAll("<\\x");
try std.fmt.formatIntValue(ch, "X", options, writer);
return writer.writeAll(">");
}
} else {
unreachable;
}
}
};
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