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//! The json pick out command.
//!
//! ```text
//! Usage:
//!   aki-json-pick [options]
//!
//! The json pick out command.
//!
//! Options:
//!       --color <when>        json colored output.
//!   -s, --select <selector>   pick out json value by <selector>.
//!   -p, --pretty              pretty output.
//!   -r, --raw-output          raw string output without JSON double-quote.
//!
//!   -H, --help        display this help and exit
//!   -V, --version     display version information and exit
//!   -X <x-options>    x options. try -X help
//!
//! Option Parameters:
//!   <when>        'always', 'never', or 'auto'
//!   <selector>    json selector
//!
//! Examples:
//!   pick out some.property value:
//!     echo -e '{ "some": { "property": "yay!" } }' | aki-json-pick -s '"some"."property"'
//! ```
//!
//! # Examples
//!
//! ## Example 1: root selection
//!
//! command line:
//! ```text
//! cat fixtures/01.json | aki-json-pick -s '.'
//! ```
//!
//! result output:
//! ```text
//! "This is a valid JSON text with one value"
//! ```
//!
//! ## Example 2: child selection
//!
//! command line:
//! ```text
//! cat fixtures/01.json | aki-json-pick -s '"some"."property"'
//! ```
//!
//! result output:
//! ```text
//! "yay!"
//! ```
//!
//! ## Example 3: index selection
//!
//! command line:
//! ```text
//! cat fixtures/01.json | aki-json-pick -s '"primes".[0]'
//! ```
//!
//! result output:
//! ```text
//! 7
//! ```
//!
//! command line:
//! ```text
//! cat fixtures/01.json | aki-json-pick -s '"primes"[0]"'
//! ```
//!
//! result output:
//! ```text
//! 7
//! ```
//!
//! command line:
//! ```text
//! cat fixtures/01.json | aki-json-pick -s '"primes".[2,0]'
//! ```
//!
//! result output:
//! ```text
//! [13,7]
//! ```
//!
//! # Reference
//!
//! This crate use [jql](https://crates.io/crates/jql). The `selector` is comatible.
//!
//! # Library example
//!
//! See [`fn execute()`] for this library examples.
//!
//! [`fn execute()`]: crate::execute

#[macro_use]
extern crate anyhow;

mod conf;
mod run;
mod util;

use flood_tide::HelpVersion;
use runnel::RunnelIoe;
use std::io::Write;

const TRY_HELP_MSG: &str = "Try --help for help.";

/// execute stats
///
/// params:
///   - sioe: stream in/out/err
///   - program: program name. etc. "json-pick"
///   - args: parameter arguments.
///
/// return:
///   - ok: ()
///   - err: anyhow
///
/// # Examples
///
/// ## Example 1: root selection
///
/// ```rust
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_json_pick::execute(&RunnelIoeBuilder::new().build(),
///     "json-pick", &["-s", "."]);
/// ```
///
pub fn execute(sioe: &RunnelIoe, prog_name: &str, args: &[&str]) -> anyhow::Result<()> {
    let conf = match conf::parse_cmdopts(prog_name, args) {
        Ok(conf) => conf,
        Err(errs) => {
            for err in errs.iter().take(1) {
                if err.is_help() || err.is_version() {
                    let _r = sioe.pout().lock().write_fmt(format_args!("{}\n", err));
                    return Ok(());
                }
            }
            return Err(anyhow!("{}\n{}", errs, TRY_HELP_MSG));
        }
    };
    run::run(sioe, &conf)
}