CLIGuide
Build a Disk Usage Analyzer in Rust Like du and ncdu
du walks a tree and adds up file sizes. The interesting decisions are hard links counted once, symlinks left alone and how to keep going when a directory is unreadable.
16 min read
Library
Everything you need to level up your coding skills.
CLIGuide
Build a Fuzzy Finder in Rust With Crossterm and Nucleo
A fuzzy finder reads lines, filters them as you type and prints the one you pick. The pieces are raw mode input, a matching engine and a small redraw loop.
21 min read
CLIGuide
Build a Markdown to HTML Converter CLI in Rust With Pulldown
pulldown-cmark turns Markdown into a stream of events, and its HTML writer renders them. A small CLI adds file handling, options and a page template around it.
20 min read
CLIGuide
Build a jq Style JSON Query Tool in Rust Step by Step
A jq clone needs three parts: a parser for a small path language, an evaluator over serde_json values and a printer. The core is about 150 lines.
16 min read
CLIGuide
Releasing a Rust CLI With Cargo Dist and GitHub Actions
cargo-dist generates a release workflow that builds your binary for every platform, packages it and publishes installers when you push a version tag.
14 min read
CLIGuide
Build a Log Analyzer in Rust With Regex and Iterators
A log analyzer is a streaming pipeline: read lines, parse with a regex, fold into counters and print the top entries. Iterators keep memory flat on gigabyte files.
16 min read
CLI
Reading Large Files in Rust With Buffered IO and Memory Maps
Read a file line by line with BufReader and reuse a buffer, or map it into memory with memmap2. Compare the options, the unsafe contract of mmap, and when reading in chunks is the safer and equally fast choice.
3 min read
CLI
Benchmarking Rust CLIs Against Shell Pipelines Fairly
Use hyperfine to compare your CLI with grep, awk or a pipeline: warmup runs, prepare commands for cache control, parameter sweeps and export. Avoid the traps that make comparisons unfair.
3 min read
CLI
Regex Performance in Rust and Avoiding Catastrophic Cases
Rust's regex crate guarantees linear-time matching, so there is no catastrophic backtracking. The real costs are compiling in a loop, unanchored scans and capture groups. Learn what to cache and when to use regex-lite.
4 min read
Tooling
Rust Error Broken Pipe When Writing to Standard Output
Piping your Rust program into head makes println panic with Broken pipe. Rust ignores SIGPIPE, so handle the write error, or restore the default signal behavior in tools.
2 min read
CLI
Regex in Rust the regex Crate and Its Guarantees Explained
The regex crate guarantees linear time matching by leaving out backreferences and lookaround. See the API, the compile-once rule and what to use when you need the missing features.
3 min read
CLI
Testing Rust Command Line Tools With Assert Cmd Step by Step
Test a CLI end to end with assert_cmd and predicates: run the real binary, check the exit status, stdout and stderr, feed stdin and use temporary files.
2 min read
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