### Install bpaf_cauwugo

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Install the bpaf_cauwugo tool using cargo.

```bash
$ cargo install bpaf_cauwugo
```

--------------------------------

### Running Example

Source: https://github.com/pacak/bpaf/blob/master/README.md

Demonstrates how to run examples from the bpaf repository using cargo.

```shell
$ cargo run --example example_name
```

--------------------------------

### cauwugo test completion for bins, tests, and examples

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Shows autocompletion for testable items like bins, tests, and examples with cauwugo test.

```bash
% cauwugo test <TAB>
[skip]
Bins, tests, examples
adjacent    bpaf    bpaf_derive    derive    help_format
% cauwugo test de<TAB>
% cauwugo test derive
% cauwugo test derive <TAB>
Available test names
command_and_fallback    help_with_default_parse
% cauwugo test derive co<TAB>
% cauwugo test derive command_and_fallback<ENTER>
```

--------------------------------

### Dynamic Build Target Completion for `cauwugo build`

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Shows dynamic completion for build examples and target architectures. It also lists available targets.

```console
% cauwugo build --example se<TAB>
```

```console
% cauwugo build --example sensors
```

```console
% cauwugo build --example sensros --target <TAB>
```

```console
% cauwugo build --example sensors --target
```

```console
armv7-unknown-linux-gnueabihf  x86_64-pc-windows-gnu          x86_64-unknown-linux-gnu
```

```console
% cauwugo build --example sensors --target a<TAB>
```

```console
% cauwugo build --example sensors --target armv7-unknown-linux-gnueabihf
```

--------------------------------

### cauwugo test execution example

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Illustrates the output after running a specific test using cauwugo test.

```text
Finished test [unoptimized + debuginfo] target(s) in 0.00s
     Running tests/derive.rs (target/debug/deps/derive-7ef117342dbf6a84)

running 1 test
test command_and_fallback ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00s
```

--------------------------------

### Feature Flags for Color Output

Source: https://github.com/pacak/bpaf/blob/master/README.md

Example of how to expose color features as feature flags in your Cargo.toml for conditional compilation.

```toml
[features]
bright-color = ["bpaf/bright-color"]
dull-color = ["bpaf/dull-color"]
```

--------------------------------

### Generate Zsh Completion Script

Source: https://github.com/pacak/bpaf/blob/master/README.md

Redirect the output of your program with the --bpaf-complete-style-zsh flag to a file in your zsh completions directory, ensuring the filename starts with an underscore.

```console
$ your_program --bpaf-complete-style-zsh > ~/.zsh/_your_program
```

--------------------------------

### Define arguments using bpaf combinatoric API

Source: https://github.com/pacak/bpaf/blob/master/README.md

Construct argument parsers programmatically using combinators. This example defines speed and distance arguments and combines them into a struct.

```rust
use bpaf::{construct, long, Parser};
#[derive(Clone, Debug)]
struct SpeedAndDistance {
    /// Speed in KPH
    speed: f64,
    /// Distance in miles
    distance: f64,
}

fn main() {
    // primitive parsers
    let speed = long("speed")
        .help("Speed in KPH")
        .argument::<f64>("SPEED");

    let distance = long("distance")
        .help("Distance in miles")
        .argument::<f64>("DIST");

    // parser containing information about both speed and distance
    let parser = construct!(SpeedAndDistance { speed, distance });

    // option parser with metainformation attached
    let speed_and_distance
        = parser
        .to_options()
        .descr("Accept speed and distance, print them");

    let opts = speed_and_distance.run();
    println!("Options: {:?}", opts);
}
```

--------------------------------

### Define arguments using bpaf derive API

Source: https://github.com/pacak/bpaf/blob/master/README.md

Use the `#[derive(Bpaf)]` macro to automatically generate argument parsing code from a struct definition. This example defines speed and distance arguments.

```rust
use bpaf::Bpaf;

#[derive(Clone, Debug, Bpaf)]
#[bpaf(options, version)]
/// Accept speed and distance, print them
struct SpeedAndDistance {
    /// Speed in KPH
    speed: f64,
    /// Distance in miles
    distance: f64,
}

fn main() {
    // #[derive(Bpaf)] generates `speed_and_distance` function
    let opts = speed_and_distance().run();
    println!("Options: {:?}", opts);
}
```

--------------------------------

### Dynamic Package Completion for `cauwugo add`

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Demonstrates dynamic completion for package names when adding a dependency. It also shows completion for workspace members.

```console
% cauwugo add serde<TAB>
serde    A generic serialization/deserialization framework
serde_alias    An attribute macro to apply serde aliases to all struct fields
serde_amqp    A serde implementation of AMQP1.0 protocol.
serde_any    Dynamic serialization and deserialization with the format chosen at runtime
serde_asn1_der    A basic ASN.1-DER implementation for `serde` based upon `asn1_der`
serde-big-array    Big array helper for serde.

```

```console
% cauwugo add serde_j
```

```console
% cauwugo add serde_j<TAB>
```

```console
% cauwugo add serde_json -p <TAB>
bpaf          bpaf_cauwugo  bpaf_derive   docs
```

```console
% cauwugo add serde_json -p
```

```console
% cauwugo add serde_json -p <TAB><TAB>
```

```console
% cauwugo add serde_json -p bpaf_cauwugo
```

--------------------------------

### Configure Shell Completions

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Enable shell completions for bpaf_cauwugo by running the appropriate command for your shell. This only needs to be done once.

```bash
$ cauwugo --bpaf-complete-style-bash
```

```bash
$ cauwugo --bpaf-complete-style-zsh
```

```bash
$ cauwugo --bpaf-complete-style-fish
```

```bash
$ cauwugo --bpaf-complete-style-elvish
```

--------------------------------

### cauwugo clean package completion

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Demonstrates how cauwugo autocompletes package names for the 'clean' command.

```bash
% cauwugo clean --p<TAB>
% cauwugo clean --package
% cauwugo clean --package d<TAB>
% cauwugo clean --package docs
```

--------------------------------

### cauwugo run passthrough completion

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Demonstrates passthrough argument completion for the 'cauwugo run' command when using bpaf with dynamic completion.

```bash
% cauwugo run se<TAB>
% cauwugo run sensors
% cauwugo run sensors -- <TAB>
--sensor    --sensor-device <DEVICE>    --sensor-i2c-address <ADDRESS>    --sensor-name <NAME>
% cauwugo run sensors -- --sensor --sensor-device <TAB><TAB>
elakelaiset% cauwugo run sensors -- --sensor-device outdoor                                                                                                                                                                         ~/ej/bpaf
outdoor    Outdoor temperature sensor
tank01    Temperature in a storage tank 1
tank02    Temperature in a storage tank 2
tank03    Temperature in a storage tank 3
temp100    Main temperature sensor
temp101    Output temperature sensor
```

--------------------------------

### Enable bpaf autocomplete for cauwugo run

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Configuration snippet to enable bpaf argument completion for cauwugo run within the workspace metadata.

```toml
[workspace.metadata.cauwugo]
bpaf = true # use true if all the executables/examples use bpaf or a list of packages if only some are
```

--------------------------------

### Generate Fish Completion Script

Source: https://github.com/pacak/bpaf/blob/master/README.md

Redirect the output of your program with the --bpaf-complete-style-fish flag to the appropriate completions directory for fish shell.

```console
$ your_program --bpaf-complete-style-fish > ~/.config/fish/completions/your_program.fish
```

--------------------------------

### Enable bpaf Completion Passthrough

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Configure your workspace to enable completion passthrough for bpaf-enabled packages. This requires adding a configuration to your Cargo.toml file.

```toml
[workspace.metadata.cauwugo]
bpaf = true
```

--------------------------------

### Generate Elvish Completion Script

Source: https://github.com/pacak/bpaf/blob/master/README.md

Append the output of your program with the --bpaf-complete-style-elvish flag to your elvish rc file.

```console
$ your_program --bpaf-complete-style-elvish >> ~/.config/elvish/rc.elv
```

--------------------------------

### Generate Bash Completion Script

Source: https://github.com/pacak/bpaf/blob/master/README.md

Redirect the output of your program with the --bpaf-complete-style-bash flag to a file in your bash completion directory.

```console
$ your_program --bpaf-complete-style-bash >> ~/.bash_completion
```

--------------------------------

### Enable Autocomplete Feature

Source: https://github.com/pacak/bpaf/blob/master/README.md

Add the 'autocomplete' feature to your bpaf dependency in Cargo.toml to enable shell completion capabilities.

```toml
bpaf = { version = "0.9", features = ["autocomplete"] }
```

--------------------------------

### View Cargo Zsh Completion File

Source: https://github.com/pacak/bpaf/blob/master/bpaf_cauwugo/README.md

Display the contents of the Zsh completion file provided by Cargo. This file contains static completion definitions for commands and flags.

```bash
% cat "$(rustc --print sysroot)"/share/zsh/site-functions/_cargo
```

--------------------------------

### Replace positional_os/argument_os with positional/argument

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

In version 0.6.x, `positional_os` and `argument_os` have been replaced by `positional` and `argument` respectively. Use turbofish syntax for type annotation.

```diff
-let file = positional_os("FILE").help("File to use").map(PathBuf::from);
+let file = positional::<PathBuf>("FILE").help("File to use");
```

--------------------------------

### Add bpaf to Cargo.toml for combinatoric API

Source: https://github.com/pacak/bpaf/blob/master/README.md

Include bpaf in your project's dependencies without specific features for the combinatoric API.

```toml
[dependencies]
bpaf = "0.9"
```

--------------------------------

### Test Parser with run_inner

Source: https://github.com/pacak/bpaf/blob/master/README.md

Tests a parser's help output using the run_inner function. Ensure the Options struct is defined with #[derive(Bpaf)].

```rust
#[derive(Debug, Clone, Bpaf)]
#[bpaf(options)]
pub struct Options {
    pub user: String
}

#[test]
fn test_my_options() {
    let help = options()
        .run_inner(&["--help"])
        .unwrap_err()
        .unwrap_stdout();
    let expected_help = "\
Usage --user=ARG
<skip>
";

    assert_eq!(help, expected_help);
}
```

--------------------------------

### Replace from_str with turbofish or parse

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

The `from_str` method is deprecated. Use turbofish on the consumer or the `parse` method if `String` is generated within the parser. For custom types, ensure `FromOsStr` is implemented or use `parse` with a custom conversion.

```diff
-let number = short('n').argument("N").from_str::<usize>();
+let number = short('n').argument::<usize>("N");
```

```diff
-let my = long("my-type").argument("MAGIC").from_str::<MyType>();
+let my = long("my-type").argument::<String>("MAGIC").parse(|s| MyType::from_str(s));
```

--------------------------------

### Migrate `any` to new signature in bpaf

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

When migrating from older versions of bpaf, update the `any` function signature to include generic type parameters and a closure for validation. This change improves error handling and flexibility.

```rust
let rest = any<OsString, _, _>("REST", Some);
```

```rust
let name = any("NAME", |x| (x == "Bob").then_some(x));
```

--------------------------------

### Add bpaf with derive feature to Cargo.toml

Source: https://github.com/pacak/bpaf/blob/master/README.md

Include bpaf in your project's dependencies, enabling the 'derive' feature for the derive API.

```toml
[dependencies]
bpaf = { version = "0.9", features = ["derive"] }
```

--------------------------------

### Migrate FromUtf8 Annotation

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

Update code by removing FromUtf8 annotations for type parsing. This change simplifies type handling in bpaf.

```diff
```diff
-let coin = short('c').argument::<FromUtf8<Coin>>("COIN");
+let coin = short('c').argument::<Coin>("COIN");
```
```

--------------------------------

### Parser with validation and transformation

Source: https://github.com/pacak/bpaf/blob/master/README.md

Defines a parser for speed that includes validation guards to ensure the value is within a specific range (0.0 to 100.0) and then transforms the parsed f64 into a custom Speed struct.

```rust
#[derive(Clone, Debug)]
struct Speed(f64);
fn speed() -> impl Parser<Speed> {
    long("speed")
        .help("Speed in KPH")
        .argument::<f64>("SPEED")

        // You can perform additional validation with `parse` and `guard` functions
        // in as many steps as required.
        // Before and after next two applications the type is still `impl Parser<f64>`
        .guard(|&speed| speed >= 0.0, "You need to buy a DLC to move backwards")
        .guard(|&speed| speed <= 100.0, "You need to buy a DLC to break the speed limits")

        // You can transform contained values, next line gives `impl Parser<Speed>` as a result
        .map(|speed| Speed(speed))
}
```

--------------------------------

### Define a basic speed parser

Source: https://github.com/pacak/bpaf/blob/master/README.md

A regular function that defines a parser for a single floating-point number argument named 'speed'. This function can be shared across different parts of your application.

```rust
fn speed() -> impl Parser<f64> {
    long("speed")
        .help("Speed in KPH")
        .argument::<f64>("SPEED")
}
```

--------------------------------

### Update `many` with `req_flag` in bpaf

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

If you previously used `switch` or an option with fallback in combination with `many`, replace `switch` with `req_flag` and move the fallback logic outside the `many` combinator to ensure correct behavior.

```rust
let verbose = short('v').req_flag(()).many().map(|x| x.len());
```

--------------------------------

### Parse multiple speed arguments

Source: https://github.com/pacak/bpaf/blob/master/README.md

This parser accepts multiple occurrences of the '--speed' flag from the command line, collecting all provided values into a vector.

```rust
fn multiple_args() -> impl Parser<Vec<f64>> {
    speed().many()
}
```

--------------------------------

### Rename types: Positional, BuildArgument, Command, Named

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

Several types have been renamed in version 0.6.x for clarity. Ensure your code reflects these changes: `Positional` to `ParsePositional`, `BuildArgument` to `ParseArgument`, `Command` to `ParseCommand`, and `Named` to `NamedArg`.

--------------------------------

### Parse speed argument with a fallback value

Source: https://github.com/pacak/bpaf/blob/master/README.md

This parser checks for the presence of '--speed'. If the flag is not provided, it defaults to a value of 42.0.

```rust
fn with_fallback() -> impl Parser<f64> {
    speed().fallback(42.0)
}
```

--------------------------------

### Replace `anywhere` with `adjacent` in bpaf

Source: https://github.com/pacak/bpaf/blob/master/Changelog.md

In bpaf version 0.8.0 and later, the `anywhere` modifier has been replaced by the `adjacent` method. Use `adjacent` to replicate the behavior of parsing blocks from arbitrary places.

```rust
let set = construct!(set, name, value).adjacent();
```

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