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use std::{env, error::Error, fs::File, io::Read};
use colored::Colorize;
const ARGS_LIMIT: usize = 4;
pub struct Config {
pub file: String,
pub pattern: String,
}
impl Config {
pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
if args.len() >= ARGS_LIMIT {
return Err("Expected 2 arguments but more than 2 arguments were provided!");
}
args.next();
let (file, pattern): (String, String) = (
match args.next() {
Some(arg) => arg,
None => return Err("No file provided!"),
},
match args.next() {
Some(arg) => arg.to_lowercase(),
None => return Err("No pattern provided!"),
},
);
Ok(Config { file, pattern })
}
}
fn search<'a>(pattern: &str, content: &'a str) -> Vec<&'a str> {
content
.lines()
.filter(|line: &&str| line.to_lowercase().contains(&pattern.to_ascii_lowercase()))
.collect()
}
fn summarize(occurrence: usize, line_count: usize) -> String {
let summary: String;
if occurrence == 0 {
summary = format!(
"{:1} {:1} {:1}",
"Found".red(),
occurrence.to_string().red(),
"occurrence!".red()
)
} else {
let (mut occurrence_word, mut line_word): (String, String) =
("occurrence".parse().unwrap(), "line".parse().unwrap());
match (occurrence, line_count) {
(0, _) | (1, _) => {
line_word.push("s".parse().unwrap());
}
(_, 0) | (_, 1) => {
occurrence_word.push("s".parse().unwrap());
}
_ => {
line_word.push("s".parse().unwrap());
occurrence_word.push("s".parse().unwrap());
}
}
summary = format!(
"{:1}\n{:1} {:1} {:1} {:1} {:1} {:1} {:1}{:1}",
"--Summary--".yellow(),
"*".green().bold(),
"Found".green(),
occurrence.to_string().trim().blue().bold(),
occurrence_word.green(),
"in".green(),
line_count.to_string().blue().bold(),
line_word.green(),
"!".green()
);
}
summary
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
println!(
"\n{:1} {:1} {:1} {:1}\n",
"Search result for".green(),
&config.pattern.bright_cyan().bold(),
"in".green(),
&config.file.bright_cyan().bold(),
);
let (mut file, mut contents): (File, String) = (File::open(config.file)?, String::new());
file.read_to_string(&mut contents)?;
let results: Vec<&str> = search(&config.pattern, &contents);
let (mut line_count, mut total_occurrence): (usize, usize) = (0usize, 0usize);
for line in results {
let occurrences: String = format!(
"{:1}",
line.to_lowercase()
.matches(&config.pattern)
.count()
.to_string()
.yellow()
.bold()
);
line_count += 1;
total_occurrence += line.to_lowercase().matches(&config.pattern).count();
println!("{:1} [ {:1} ]", line.to_string().magenta(), occurrences);
}
println!("\n{:1}", summarize(total_occurrence, line_count));
Ok(())
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn case_sensitive() {
let pattern: &str = "is";
let contents: &str = "\
Hello There!
This is just a random text.
There is no errors.";
assert_eq!(
vec!["This is just a random text.", "There is no errors."],
search(pattern, contents)
);
}
#[test]
fn case_insensitive() {
let pattern: &str = "tH";
let contents: &str = "\
Hello There!
This is another random text.
There should be no errors as well.";
assert_eq!(
vec![
"Hello There!",
"This is another random text.",
"There should be no errors as well."
],
search(pattern, contents)
);
}
}