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



use std::fs::File;
use std::io::prelude::*;
use std::error::Error;
use std::env;


pub fn run(config: Config) -> Result<(), Box<Error>> {
    let mut f = File::open(config.filename)?; //.expect("file not found");

    let mut contents = String::new(); 
    f.read_to_string(&mut contents)?; //.expect("something went wrong reading the file");
    
    for line in search(&config.query, &contents) {
         println!("{}", line); 
    }
    
    let results = if config.case_sensitive {
         search(&config.query, &contents)
    } else {
         search_case_insensitive(&config.query, &contents)
    };

    for line in results {
         println!("{}", line);
    }

    Ok(())
}
pub struct Config { 
    pub query: String, 
    pub filename: String,
    pub case_sensitive: bool,
 
}

impl Config  { 
  pub fn new(mut args: std::env::Args /*&[String]*/) -> Result<Config, &'static str> {
      if args.len() < 3 {
          return Err("No search string && no file name found");
          
      }
/*      let query = args[1].clone();
*/      let query = match args.next() {
          Some(arg) => arg,
          None => return Err("Didn't get a query string"),
        };
    

/*      let filename = args[2].clone();
*/      let filename = match args.next() {
          Some(arg) => arg, 
          None => return Err("Didn't get a file name"),
        };

      let case_sensitive = env::var("CASE_INSENSITIVE") .is_err();

      
      Ok(Config {
/*           query: query,           filename: filename,
*/           query,                  filename,
           case_sensitive: case_sensitive,
        }) 

  }
}

pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> { 
    
    let /*mut*/ results = Vec::new();
/*   for line in contents.lines() {if line.contains(query) {results.push(line);} 
*/   fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> { 
        contents.lines() 
            .filter(|line| line.contains(query)) 
            .collect()
    }

    results
 
} 
fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
     let query = query.to_lowercase();
     let mut results = Vec::new();

     for line in contents.lines() {
         if line.to_lowercase().contains(&query) {
             results.push(line);
         }
     }

     results
} 


#[cfg(test)] 
mod test { 
    use super::*;

    #[test] 
    fn one_result() {
         let query = "duct"; 
         let contents = "\
Rust: 
safe, fast, productive.
Pick three.";
    
         assert_eq!(
              vec!["safe, fast, productive."],
              search(query, contents) 
         );
    }

    fn case_sensitive() { 
         let query = "duct";
         let contents = "\
Rust: 
safe, fast, productive.
Pick three.
Duct tape.";

         assert_eq!(
             vec!["safe, fast, productive."],
             
             search(query, contents)

         );

    }

    fn case_insensitive() { 
         let query = "duct";
         let contents = "\
Rust: 
safe, fast, productive.
Pick three.
Duct tape.";

         assert_eq!(
             vec!["Rust:","Trust me."],
             
             search_case_insensitive(query, contents)

         );

    }
}