Add command line interface for testing queries

src/archive/fetcher.rs

@@ -101,4 +101,11 @@ where
     pub fn iter(&self) -> impl Iterator<Item = &Story> {
         self.index.iter()
     }
+
+    pub fn filter<F>(&self, function: &F) -> Vec<&Story>
+    where
+        F: Sync + Fn(&Story) -> bool,
+    {
+        self.index.iter().filter(|s| function(s)).collect()
+    }
 }

src/main.rs

@@ -5,10 +5,14 @@ pub mod error;
 pub mod query;
 
 use std::env::args;
+use std::io::stdin;
+use std::io::stdout;
+use std::io::Write;
 use std::time::Instant;
 
 use crate::archive::Fetcher;
 use crate::error::Error;
+use crate::query::parse;
 
 fn exit(error: Error) -> ! {
     eprintln!("{}", error);
@@ -16,6 +20,16 @@ fn exit(error: Error) -> ! {
     std::process::exit(1)
 }
 
+fn input() -> String {
+    let mut buffer = String::new();
+
+    print!(">>> ");
+    stdout().flush().unwrap();
+    stdin().read_line(&mut buffer).unwrap();
+
+    buffer
+}
+
 fn main() {
     let argv = args().collect::<Vec<String>>();
 
@@ -28,10 +42,38 @@ fn main() {
 
     let start = Instant::now();
     let result = Fetcher::from(&argv[1]);
-    let finish = Instant::now() - start;
-
     let fetcher = result.map_err(exit).unwrap();
+    let finish = (Instant::now() - start).as_millis();
+    let count = fetcher.iter().count();
 
-    println!("Finished loading in {} milliseconds.", finish.as_millis());
-    println!("The archive contains {} stories.", fetcher.iter().count());
+    println!("Finished loading in {} milliseconds.", finish);
+    println!("The archive contains {} stories.", count);
+
+    loop {
+        let filter = match parse(&input()) {
+            Ok(filter) => filter,
+            Err(error) => {
+                println!("{}", error);
+                continue;
+            }
+        };
+
+        let start = Instant::now();
+        let stories = fetcher.filter(&filter);
+        let finish = (Instant::now() - start).as_millis();
+        let count = stories.len();
+
+        println!("Found {} stories in {} milliseconds!", count, finish);
+
+        if count > 32 {
+            continue;
+        }
+
+        for story in stories.iter() {
+            let key = &story.id;
+            let title = &story.title;
+
+            println!("[{}] {}", key, title);
+        }
+    }
 }