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How to make CLI tools composing different output formats using [clap](https://crates.io/crates/clap).
Demo:
$ ./target/debug/rust-clap-output-formats --help
Usage: rust-clap-output-formats <COMMAND>
Commands:
debug Debug output by default
text Text output by default
api Unformatted JSON output by default
json Pretty formatted JSON output by default
yaml YAML output by default
table Table output by default
help Print this message or the help of the given subcommand(s)
Options:
-h, --help Print help
$ ./target/debug/rust-clap-output-formats debug --help
Debug output by default
Usage: rust-clap-output-formats debug [OPTIONS]
Options:
--debug Display as internal debug representation
--text Display as text
--api Display as unformatted JSON
-h, --help Print help
$ ./target/debug/rust-clap-output-formats table --help
Table output by default
Usage: rust-clap-output-formats table [OPTIONS]
Options:
--table Display as table
--yaml Display as YAML
--json Display as pretty formatted JSON
--api Display as unformatted JSON
--text Display as text
--debug Display as internal debug representation
-h, --help Print help
$ ./target/debug/rust-clap-output-formats json
{
"name": "Hello",
"value": "world"
}
$ ./target/debug/rust-clap-output-formats table
+-------+-------+
| Name | Value |
+===============+
| Hello | world |
+-------+-------+
$ ./target/debug/rust-clap-output-formats table --json
{
"name": "Hello",
"value": "world"
}
$ ./target/debug/rust-clap-output-formats table --yaml
name: Hello
value: world
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