Pantheon: Parsing command line arguments
The "sheshat" library in Rust enables command line argument parsing without the standard library, supporting various argument types and simplifying structure definitions through macros while ensuring effective error handling.
Read original article
The article discusses the development of a Rust library named "sheshat" for parsing command line arguments, designed to be used in environments where the standard library may not be available, such as kernel development. The library aims to handle various types of command line arguments, including short flags, long options, and positional arguments. It will provide a derive macro to simplify the parsing process by allowing users to define argument structures easily. The parsing mechanism involves lexing the input arguments and categorizing them into flags, options, and positional arguments. The library will also implement a procedural macro to facilitate the parsing of structs, allowing for attributes that define how fields correspond to command line arguments. The article outlines the challenges of implementing this macro without external dependencies and discusses the need for careful parsing of Rust syntax. It emphasizes the importance of handling errors gracefully and ensuring that the library can effectively parse and validate command line inputs.
- The "sheshat" library is designed for parsing command line arguments in Rust without relying on the standard library.
- It supports various argument types, including short flags, long options, and positional arguments.
- A derive macro will simplify the process of defining argument structures for users.
- The library aims to handle errors effectively and provide clear feedback during parsing.
- The implementation will focus on procedural macros to facilitate argument parsing while managing Rust syntax intricacies.
Related
I Hope Rust Does Not Oxidize Everything
The author expresses concerns about Rust's widespread adoption in programming, citing issues with syntax, async features, complexity, and long compile times. They advocate for language diversity to prevent monoculture, contrasting Rust with their language Yao.
Small Strings in Rust: smolstr vs. smartstring
The article explores Rust's small string libraries `smolstr` and `smartstring`, demonstrating JSON parsing, a custom memory allocator, and a reporting subcommand for analyzing memory usage and allocations.
Rust's Ugly Syntax (2023)
The blog post addresses complaints about Rust's syntax, attributing them to misunderstandings of its semantics. It suggests simplifying semantics for readability while maintaining performance and safety features.
An Optimization That's Impossible in Rust
The article discusses the German string data structure in Rust, which uses short string optimization for performance, challenges claims of impossibility, and addresses memory management while ensuring safety and efficiency.
"Hygienic" Let Statements in Rust
Remon, a library developer in Rust, faces hygiene issues with macros causing variable shadowing. She opts for a simpler solution to maintain usability while balancing correctness and complexity in software development.
1 commentsThe main thing I wanted them to do is to behave well with configuration both from a config file and from command line arguments. Lots of libraries exist for either but none existed for both: I wanted to have something that would be able to correctly pull something like the PID file location from a config file but also be able to be overwritten by a command line argument. I also wanted to be as simple to use as possible. The code is hosted at https://github.com/ipartola/groper
I am not sure if in today’s world of systemd this is useful at all. The code probably needs clean up since it was written to be compatible with both Python 2 and 3 at the time. But I have to say that I haven’t seen anything like this since I wrote this code. If there is interest I can take a look at modernizing this.
Also in general I appreciate programs, especially daemons that are “well behaved”: a sensible config file format, sensible arguments parsing, sane defaults, does not background itself without an explicit configuration to do so, logs to stdout and stderr by default. I feel like there is less and less emphasis on stuff like this lately.
Related
I Hope Rust Does Not Oxidize Everything
The author expresses concerns about Rust's widespread adoption in programming, citing issues with syntax, async features, complexity, and long compile times. They advocate for language diversity to prevent monoculture, contrasting Rust with their language Yao.
Small Strings in Rust: smolstr vs. smartstring
The article explores Rust's small string libraries `smolstr` and `smartstring`, demonstrating JSON parsing, a custom memory allocator, and a reporting subcommand for analyzing memory usage and allocations.
Rust's Ugly Syntax (2023)
The blog post addresses complaints about Rust's syntax, attributing them to misunderstandings of its semantics. It suggests simplifying semantics for readability while maintaining performance and safety features.
An Optimization That's Impossible in Rust
The article discusses the German string data structure in Rust, which uses short string optimization for performance, challenges claims of impossibility, and addresses memory management while ensuring safety and efficiency.
"Hygienic" Let Statements in Rust
Remon, a library developer in Rust, faces hygiene issues with macros causing variable shadowing. She opts for a simpler solution to maintain usability while balancing correctness and complexity in software development.