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/*!
output first or last n lines, like a head and tail of linux command.
# Features
- output first or last n lines, like a head and tail of linux command.
- minimum support rustc 1.56.1 (59eed8a2a 2021-11-01)
# Command help
```text
aki-unbody --help
```
```text
Usage:
aki-unbody [options]
output first or last n lines, like a head and tail of linux command.
Options:
-h, --head <num> output the first <num> lines.
-t, --tail <num> output the last <num> lines.
-i, --inverse output the body, except for head and tail.
-H, --help display this help and exit
-V, --version display version information and exit
Examples:
Outputs first 2 lines:
cat file1.txt | aki-unbody --head 2
Outputs last 2 lines:
cat file1.txt | aki-unbody --tail 2
Outputs body, except for first 2 lines and last 2 lines:
cat file1.txt | aki-unbody --head 2 --tail 2 --inverse
```
# Quick install
1. you can install this into cargo bin path:
```text
cargo install aki-unbody
```
2. you can build debian package:
```text
cargo deb
```
and install **.deb** into your local repository of debian package.
# Examples
The input data used in this example looks like this:
```text
cat file1.txt
```
result output:
```text
LN:0001,text
LN:0002,text
LN:0003,text
LN:0004,text
LN:0005,text
LN:0006,text
```
## Example 1: output head
Outputs first 2 lines.
command line:
```text
cat file1.txt | aki-unbody --head 2
```
result output:
```text
LN:0001,text
LN:0002,text
```
## Example 2: output tail
Outputs last 2 lines.
command line:
```text
cat file1.txt | aki-unbody --tail 2
```
result output:
```text
LN:0005,text
LN:0006,text
```
## Example 3: output head and tail
Outputs first 2 lines and last 2 lines.
command line:
```text
cat file1.txt | aki-unbody --head 2 --tail 2
```
result output:
```text
LN:0001,text
LN:0002,text
LN:0005,text
LN:0006,text
```
## Example 4: output body, except for head and tail
Outputs body, except for first 2 lines and last 2 lines.
command line:
```text
cat file1.txt | aki-unbody --head 2 --tail 2 --inverse
```
result output:
```text
LN:0003,text
LN:0004,text
```
# 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 unbody
///
/// params:
/// - sioe: stream in/out/err
/// - program: program name. etc. "unbody"
/// - args: parameter arguments.
///
/// return:
/// - ok: ()
/// - err: anyhow
///
/// # Examples
///
/// ## Example 1: output head
///
/// Outputs first 2 lines.
///
/// ```rust
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_unbody::execute(&RunnelIoeBuilder::new().build(),
/// "unbody", &["--head", "2"]);
/// ```
///
/// ## Example 2: output tail
///
/// Outputs last 2 lines.
///
/// ```rust
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_unbody::execute(&RunnelIoeBuilder::new().build(),
/// "unbody", &["--tail", "2"]);
/// ```
///
/// ## Example 3: output head and tail
///
/// Outputs first 2 lines and last 2 lines.
///
/// ```rust
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_unbody::execute(&RunnelIoeBuilder::new().build(),
/// "unbody", &["--head", "2", "--tail", "2"]);
/// ```
///
/// ## Example 4: output body, except for head and tail
///
/// Outputs body, except for first 2 lines and last 2 lines.
///
/// ```rust
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_unbody::execute(&RunnelIoeBuilder::new().build(),
/// "unbody", &["--head", "2", "--tail", "2", "--inverse"]);
/// ```
///
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!("{err}\n"));
return Ok(());
}
}
return Err(anyhow!("{}\n{}", errs, TRY_HELP_MSG));
}
};
run::run(sioe, &conf)
}