CHAPTER 01 / 05
Arguments, options, and flags
Build a command-line parser with typed arguments, flags, defaults, validation, and help.
Rust reference
clap
cheat sheet.
Arguments, subcommands, validation, output handling, shell completions, and tests for Rust command-line tools.
27 topics54 code examplesUpdated
How clap fits together
01Describe the inputsFields and attributes define what the user can type.
02Parse and validateClap converts command words into typed values.
03Do the workYour program handles files, services, and errors.
04Write the resultSend data to stdout and diagnostics to stderr.
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5 chapters · 27 topics
CHAPTER 02 / 05
Subcommands and shared options
Organize subcommands, shared options, argument relationships, environment settings, and paths.
CHAPTER 03 / 05
Output, errors, and exit codes
Separate standard output from diagnostics and return useful parse errors and exit codes.
CHAPTER 04 / 05
Builder API and advanced arguments
Customize command builders, parse advanced input shapes, and integrate JSON, errors, and verbosity.
CHAPTER 05 / 05
Shell completion and CLI testing
Generate completions and manual pages, test command-line behavior, and build a complete file-search tool.