git.r.bdr.sh - rbdr/blog/blob - src/command/help.rs

   1 use std::env::args;
   2 use std::io::Result;
   3 use super::available_commands;
   4
   5 pub struct Help;
   6
   7 impl Help {
   8     pub fn new() -> Self {
   9         Help
  10     }
  11 }
  12
  13 impl super::Command for Help {
  14     fn before_dependencies(&self) -> Vec<Box<dyn super::Command>> {
  15         vec![]
  16     }
  17
  18     fn execute(&self, _: Option<&String>) -> Result<()> {
  19         let arguments: Vec<String> = args().collect();
  20         let app_name = arguments.get(0).map_or("blog", |s| s.as_str());
  21         let commands = available_commands();
  22         println!("Usage:");
  23         println!("");
  24         for command in commands {
  25             print!("{} {} ", app_name, command.command());
  26             println!("{}", command.help());
  27         }
  28         return Ok(())
  29     }
  30
  31     fn after_dependencies(&self) -> Vec<Box<dyn super::Command>> {
  32         vec![]
  33     }
  34
  35     fn command(&self) -> &'static str {
  36         "help"
  37     }
  38
  39     fn help(&self) -> &'static str {
  40         "\t\t\t\tPrints this help"
  41     }
  42 }