zcon

A console output library.

const zcon = @import("zcon");

pub fn main() !void {
    var out = zcon.Writer.init();
    defer out.flush();
    defer out.useDefaultColors();

    out.useDedicatedScreen();
    defer out.useDefaultScreen();

    out.clearScreen();
    out.setColor(zcon.Color.col16(.bright_yellow));
    out.put("yellow text #red red text #def default text #prv red text");
}

write functions

zcon.Writer has all the standard zig writer functions so it can be passed to any function expecting a writer. zcon.Writer also contains additional functions for convenience and performance.

• zcon.Writer.put() : like writer.writeAll() but ignores errors
• zcon.Writer.fmt() : like writer.print() but ignores errors
• zcon.Writer.putRaw() : like writer.put() but does no macro expansion or indenting
• zcon.Writer.fmtRaw() : like writer.fmt() but does no macro expansion or indenting
• zcon.Writer.putAt() : like writer.put() but sets cursor position before writing
• zcon.Writer.fmtAt() : like writer.fmt() but sets cursor position before writing

All writing is buffered, zcon.Writer.flush() should be called to ensure output gets printed.

macros

A zcon.Writer will resolve any macros before printing to stdout. Macros take the form #name:param1,'param2';. The terminating semicolon is optional, with no semicolon the macro will consume a single space. Parameters can be surrounded in single quotes to include spaces, semicolons, and hashes.

• #name#age expands to patrick26
• #name #age expands to patrick26
• #name;#age; expands to patrick26
• #name; #age; expands to patrick 26

Below is a complete list of built in macros. Parameters surrounded in square brackets are optional. Macros with optional [text] paramer prints text with effect but does not persist the effect.

Note: most macros are implemented with ansi escape codes and require terminal support. If some macros aren't working try a defferent terminal.

macro	parameters	desc	example
#def	[text]	set to default fg color	"#blu blue #def back to normal"
#prv	[text]	restore previous fg color	"#blu blue #red red #prv blue"
#red	[text]	set fg color to red	"#blu blue #red:'this is red' blue"
#grn	[text]	set fg color to green	"#blu blue #grn:'this is green' blue"
#blu	[text]	set fg color to blue	"#blu blue text
#mag	[text]	set fg color to magenta	"#mag; magenta, leading space"
#cyn	[text]	set fg color to cyan	"#cyn this text is cyan"
#yel	[text]	set fg color to yellow	"#yel bannana"
#wht	[text]	set fg color to white	"#wht white text"
#blk	[text]	set fg color to black	"#blk can you see me?"
#bred	[text]	set fg color to bright red	"#blu blue #bred:'this is bright red'; blue"
#bgrn	[text]	set fg color to bright green	"#blu blue #bgrn:'this is green' blue"
#bblu	[text]	set fg color to bright blue	"#bblu blue text
#bmag	[text]	set fg color to bright magenta	"#bmag; magenta, leading space"
#bcyn	[text]	set fg color to bright cyan	"#bcyn this text is cyan"
#byel	[text]	set fg color to bright yellow	"#byel bannana"
#gry	[text]	set fg color to grey	"#gry grey text"
#dgry	[text]	set fg color to dark grey	"#gry grey text"
#fg	hex,[text]	set fg color to rgb hex color	"#fg:ff55ff purple!"
#bg	hex,[text]	set bg color to rgb hex color	"#bg:ff55ff purple background!"
#n	[text]	disable all styles	"#b#i bold and italic #n normal"
#b	off|[text]	use bold style	"#b:'bold' normal #b bold #b:off normal"
#d	off|[text]	use dim style	"#d:'dim' normal #d dim #d:off normal"
#i	off|[text]	use italic style	"#i:'italic' normal #i italic #i:off normal"
#u	off|[text]	use underline style	"#u:'underline' normal #u underline #u:off normal"
#s	off|[text]	use strikethrogh style	"#s:'strike' normal #s strike #s:off normal"
#du	off|[text]	use double underline style	"#du:'double' normal #du double #du:off normal"
#blink	off|[text]	use blinking text	"#blu#blink flashing eyes #blink:off#def"
#inverse	off|[text]	swap fg and bg colors	"#fg:f00#bg:00f red on blue #inverse:'blue on red'"
#repeat	text,[count]	print text count times, count defaults to 1	"#repeat:'hello ',5"
#rule	length	print a horizontal rule at cursor with length length	"#rule:34"
#box	w,h	print a box at cursor with size w,h	"#box:20,3 inside box"
#indent	none	print a single indent	"== HEADER ==\n #indent content"
#up	[amt]	move cursor up amt or 1	"#up:3"
#down	[amt]	move cursor down amt or 1	"#down:4"
#left	[amt]	move cursor left amt or 1	"#left:10"
#right	[amt]	move cursor right amt or 1	"hellp#right o"

format args get resolved before macros so the following is possible

writer.fmt("\n#rule:{}", .{writer.getSize().width});

custom macros

You can implement custom macros by providing a zcon.MacroMap called macros in your root source file.

const zcon = @import("zcon");

const macros = zcon.MacroMap.init(.{
    .{"name", nameMacro},
    .{"age", ageMacro},
});

fn nameMacro(writer: *zcon.Writer, params: *zcon.ParamIterator) !bool {
    writer.putRaw("patrick");
    return true;
}

fn ageMacro(writer: *zcon.Writer, params: *zcon.ParamIterator) !bool {
    writer.putRaw("26");
    return true;
}

pub fn main() !void {
    var out = zcon.Writer.init();
    defer out.flush();
    defer out.useDefaultColors();

    out.put("Yo, I'm ya boi #name;, #age; years ol'");
}

usage

1. Add zcon as a dependency in your build.zig.zon.

   build.zig.zon example

   .{
       .name = "<name_of_your_package>",
       .version = "<version_of_your_package>",
       .dependencies = .{
           .zcon = .{
               .url = "https://github.com/PatrickTorgerson/zcon/archive/<git_tag_or_commit_hash>.tar.gz",
               .hash = "<package_hash>",
           },
       },
   }

   Set <package_hash> to 12200000000000000000000000000000000000000000000000000000000000000000, and Zig will provide the correct found value in an error message.

2. Add zcon as a module in your build.zig.

   build.zig example

   const zcon = b.lazyDependency("zcon", .{
       .optimize = optimize,
       .target = target,
   }).module("zcon");
   //...
   exe.root_module.addImport("zcon", zcon);

license

MIT License

Copyright (c) 2024 Patrick Torgerson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.