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In order to update the printed progress string the code tried to move the cursor N cells to the left, where N is the number of written bytes, and then clear the remaining part of the line. This strategy has two main issues: - Is only valid if the number of characters is equal to the number of written bytes, - Is only valid if the line doesn't get too long. The second point is the main motivation for this change, when the line becomes too long the terminal wraps it to a new physical line. This means that moving the cursor to the left won't be enough anymore as once the left border is reached it cannot move anymore. The wrapped line is still stored by the terminal as a single line, despite now taking more than a single one when displayed. If you try to resize the terminal you'll notice how the contents are reflowed and are essentially illegible. Querying the cursor position on non-Windows systems (plot twist, Microsoft suggests using VT escape sequences on newer systems) is extremely cumbersome so let's do something different. Before printing anything let's save the cursor position and clear the screen below the cursor, this way we ensure there's absolutely no trace of stale data on screen, and after the message is printed we simply restore it.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
Resources
- Introduction
- Download & Documentation
- Chapter 0 - Getting Started | ZigLearn.org
- Community
- Contributing
- Code of Conduct
- Frequently Asked Questions
- Community Projects
Installation
- download a pre-built binary
- install from a package manager
- build from source
- bootstrap zig for any target
License
The ultimate goal of the Zig project is to serve users. As a first-order effect, this means users of the compiler, helping programmers to write better software. Even more important, however, are the end-users.
Zig is intended to be used to help end-users accomplish their goals. Zig should be used to empower end-users, never to exploit them financially, or to limit their freedom to interact with hardware or software in any way.
However, such problems are best solved with social norms, not with software licenses. Any attempt to complicate the software license of Zig would risk compromising the value Zig provides.
Therefore, Zig is available under the MIT (Expat) License, and comes with a humble request: use it to make software better serve the needs of end-users.
This project redistributes code from other projects, some of which have other licenses besides MIT. Such licenses are generally similar to the MIT license for practical purposes. See the subdirectories and files inside lib/ for more details.