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/*!
concatenate files that are plain, gzip, xz and zstd.
# Features
- concatenate files that are plain, gzip ... etc.
- input files are decompressed by auto.
- minimum support rustc 1.60.0 (7737e0b5c 2022-04-04)
# Command help
```text
aki-xcat --help
```
```text
Usage:
aki-xcat [options] [<file>...]
this is like a cat, zcat, xzcat, zstdcat and lz4cat.
with no <file> or when <file> is -, read standard input.
automatic discovery file type: plain, gz, xz, zst and lz4.
Options:
-n, --number output line number for each lines
-f, --file-name output file name for each lines
--path-name output path name for each lines
-p, --pipe-in <num> read from pipe <num> [unimplemented]
-H, --help display this help and exit
-V, --version display version information and exit
Argument:
<file> utf-8 encoded text file. A compressed file of it by gzip, xz, zstd, lz4.
Examples:
You can simple use. Just arrange the files.
aki-xcat file1 file2.gz file3.xz file4.zst file5.lz4
```
# Quick install
1. you can install this into cargo bin path:
```text
cargo install aki-xcat
```
2. you can build debian package:
```text
cargo deb
```
and install **.deb** into your local repository of debian package.
# Examples
The input file used in this example looks like this:
```text
cat fixtures/plain.txt
```
result output :
```text
abcdefg
hijklmn
```
```text
zcat fixtures/gztext.txt.gz
```
result output :
```text
ABCDEFG
HIJKLMN
```
## Example 1: simple concatenate
concatenate plain text file and gzip text file.
```text
aki-xcat fixtures/plain.txt fixtures/gztext.txt.gz
```
result output :
```text
abcdefg
hijklmn
ABCDEFG
HIJKLMN
```
## Example 2: multi file formats
concatenate plain text file, gzip text file, xz text file, zstd text file and lz4 text file.
```text
aki-xcat fixtures/plain.txt fixtures/gztext.txt.gz fixtures/xztext.txt.xz fixtures/zstext.txt.zst fixtures/lz4text.txt.lz4
```
## Example 3: output all line number
concatenate plain text file and gzip text file.
```text
aki-xcat -n fixtures/plain.txt fixtures/gztext.txt.gz
```
result output :
```text
1 abcdefg
2 hijklmn
3 ABCDEFG
4 HIJKLMN
```
## Example 4: file name and line number
concatenate plain text file and gzip text file.
```text
aki-xcat -n -f fixtures/plain.txt fixtures/gztext.txt.gz
```
result output :
```text
"plain.txt" 1 abcdefg
"plain.txt" 2 hijklmn
"gztext.txt.gz" 1 ABCDEFG
"gztext.txt.gz" 2 HIJKLMN
```
## Example 5: path name and line number
concatenate plain text file and gzip text file.
```text
aki-xcat -n --path-name fixtures/plain.txt fixtures/gztext.txt.gz
```
result output :
```text
"fixtures/plain.txt" 1 abcdefg
"fixtures/plain.txt" 2 hijklmn
"fixtures/gztext.txt.gz" 1 ABCDEFG
"fixtures/gztext.txt.gz" 2 HIJKLMN
```
### Library example
See [`fn execute()`] for this library examples.
[`fn execute()`]: crate::execute
*/
extern crate anyhow;
use HelpVersion;
use *;
use Write;
const TRY_HELP_MSG: &str = "Try --help for help.";
///
/// execute xcat
///
/// params:
/// - sioe: stream in/out/err
/// - program: program name. etc. "xcat"
/// - args: parameter arguments.
///
/// return:
/// - ok: ()
/// - err: anyhow
///
/// example:
///
/// ```
/// use runnel::RunnelIoeBuilder;
///
/// let r = libaki_xcat::execute(&RunnelIoeBuilder::new().build(),
/// "xcat", &["-n", "file1", "file2.gz", "file3.xz", "file4.zst"]);
/// ```
///