4 files changed, 125 insertions, 0 deletions
diff --git a/rust-book/minigrep/Cargo.lock b/rust-book/minigrep/Cargo.lock
new file mode 100755
index 0000000..5b5afdd
--- /dev/null
+++ b/rust-book/minigrep/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "minigrep"
+version = "0.1.0"
+
diff --git a/rust-book/minigrep/Cargo.toml b/rust-book/minigrep/Cargo.toml
new file mode 100755
index 0000000..09021c1
--- /dev/null
+++ b/rust-book/minigrep/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "minigrep"
+version = "0.1.0"
+authors = ["Adam Carpenter <53hornet@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+
diff --git a/rust-book/minigrep/src/lib.rs b/rust-book/minigrep/src/lib.rs
new file mode 100755
index 0000000..bb8b4d7
--- /dev/null
+++ b/rust-book/minigrep/src/lib.rs
@@ -0,0 +1,96 @@
+use std::env;
+use std::error::Error;
+use std::fs;
+
+pub struct Config {
+    pub query: String,
+    pub filename: String,
+    pub case_sensitive: bool,
+}
+
+impl Config {
+
+    pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
+        args.next();
+
+        let query = match args.next() {
+            Some(arg) => arg,
+            None => return Err("Didn't get a query string"),
+        };
+
+        let filename = match args.next() {
+            Some(arg) => arg,
+            None => return Err("Didn't get a filename"),
+        };
+
+        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
+
+        Ok(Config { query, filename, case_sensitive })
+    }
+
+}
+
+pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(config.filename)?;
+
+    let results = if config.case_sensitive {
+        search(&config.query, &contents)
+    }
+    else {
+        search_case_insensitive(&config.query, &contents)
+    };
+
+    for line in results {
+        println!("{}", line);
+    }
+
+    Ok(())
+}
+
+fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+    contents.lines()
+        .filter(|line| line.contains(query))
+        .collect()
+}
+
+fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+    contents.lines()
+        .filter(|line| line.to_lowercase()
+                .contains(&query.to_lowercase()))
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    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)
+        );
+    }
+
+    #[test]
+    fn case_insensitive() {
+        let query = "rUsT";
+        let contents = "\
+Rust:
+safe, fast, productive.
+Pick three.
+Trust me.";
+
+        assert_eq!(
+            vec!["Rust:", "Trust me."],
+            search_case_insensitive(query, contents)
+        );
+    }
+}
diff --git a/rust-book/minigrep/src/main.rs b/rust-book/minigrep/src/main.rs
new file mode 100755
index 0000000..c752da1
--- /dev/null
+++ b/rust-book/minigrep/src/main.rs
@@ -0,0 +1,17 @@
+use std::process;
+use std::env;
+
+use minigrep;
+use minigrep::Config;
+
+fn main() {
+    let config = Config::new(env::args()).unwrap_or_else(|err| {
+        eprintln!("Problem parsing arguments: {}", err);
+        process::exit(1);
+    });
+    if let Err(e) = minigrep::run(config) {
+        eprintln!("Application error: {}", e);
+        process::exit(1);
+    }
+}
+