diff options
Diffstat (limited to 'vendor/clap/src/_tutorial/chapter_2.rs')
| -rw-r--r-- | vendor/clap/src/_tutorial/chapter_2.rs | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/vendor/clap/src/_tutorial/chapter_2.rs b/vendor/clap/src/_tutorial/chapter_2.rs new file mode 100644 index 000000000..607b4e4e6 --- /dev/null +++ b/vendor/clap/src/_tutorial/chapter_2.rs @@ -0,0 +1,87 @@ +//! ## Adding Arguments +//! +//! 1. [Positionals](#positionals) +//! 2. [Options](#options) +//! 3. [Flags](#flags) +//! 4. [Subcommands](#subcommands) +//! 5. [Defaults](#defaults) +//! +//! +//! ### Positionals +//! +//! You can have users specify values by their position on the command-line: +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_03_positional.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_03_positional.md")] +//! +//! Note that the default [`ArgAction`][crate::ArgAction] is [`Set`][crate::ArgAction::Set]. To +//! accept multiple values, override the [action][Arg::action] with [`Append`][crate::ArgAction::Append]: +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_03_positional_mult.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_03_positional_mult.md")] +//! +//! ### Options +//! +//! You can name your arguments with a flag: +//! - Order doesn't matter +//! - They can be optional +//! - Intent is clearer +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_02_option.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_02_option.md")] +//! +//! Note that the default [`ArgAction`][crate::ArgAction] is [`Set`][crate::ArgAction::Set]. To +//! accept multiple occurrences, override the [action][Arg::action] with [`Append`][crate::ArgAction::Append]: +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_02_option_mult.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_02_option_mult.md")] +//! +//! ### Flags +//! +//! Flags can also be switches that can be on/off: +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_01_flag_bool.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_01_flag_bool.md")] +//! +//! To accept multiple flags, use [`Count`][crate::ArgAction::Count]: +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_01_flag_count.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_01_flag_count.md")] +//! +//! ### Subcommands +//! +//! Subcommands are defined as [`Command`][crate::Command]s that get added via +//! [`Command::subcommand`][crate::Command::subcommand]. Each instance of a Subcommand can have its +//! own version, author(s), Args, and even its own subcommands. +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_04_subcommands.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_04_subcommands.md")] +//! +//! ### Defaults +//! +//! We've previously showed that arguments can be [`required`][crate::Arg::required] or optional. +//! When optional, you work with a `Option` and can `unwrap_or`. Alternatively, you can set +//! [`Arg::default_value`][crate::Arg::default_value]. +//! +//! ```rust +#![doc = include_str!("../../examples/tutorial_builder/03_05_default_values.rs")] +//! ``` +#![doc = include_str!("../../examples/tutorial_builder/03_05_default_values.md")] +#![allow(unused_imports)] +use crate::builder::*; + +pub use super::chapter_1 as previous; +pub use super::chapter_3 as next; +pub use crate::_tutorial as table_of_contents; |