1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
//! output first or last n lines, like a head and tail of linux command. //! //! ```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 //! ``` //! //! # 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!("{}\n", err)); return Ok(()); } } return Err(anyhow!("{}\n{}", errs, TRY_HELP_MSG)); } }; run::run(sioe, &conf) }