save history if we can

README.md

@@ -54,11 +54,11 @@ Just unzip/untar the `phetch` program into your $PATH and get going!
 ### basics
 - [ ] download to ~/Downloads
     gopher://zaibatsu.circumlunar.space/1/~cardboard64/
-- [ ] `?` to show all keyboard shortcuts
 - [ ] save history to file
 - [ ] load history from file
 - [ ] load most recent URL when opening without args
 - [ ] ipv6
+- [ ] flesh out help
 ### bonus
 - [ ] TLS
 - [ ] fuzzy find search links

src/ui.rs

@@ -66,6 +66,7 @@ impl UI {
             self.draw();
             self.update();
         }
+        self.shutdown();
     }
 
     pub fn draw(&mut self) {
@@ -157,6 +158,36 @@ impl UI {
         }
     }
 
+    fn shutdown(&self) {
+        self.save_history();
+    }
+
+    fn save_history(&self) {
+        use std::fs::OpenOptions;
+        use std::path::Path;
+
+        let homevar = std::env::var("HOME");
+        if homevar.is_err() {
+            return;
+        }
+
+        let dotdir = "~/.config/phetch".replace('~', &homevar.unwrap());
+        let dotdir = Path::new(&dotdir);
+        if !dotdir.exists() {
+            return;
+        }
+
+        let mut out = String::new();
+        for page in &self.pages {
+            out.push_str(&page.url());
+            out.push('\n');
+        }
+        let history = dotdir.join("history");
+        if let Ok(mut file) = OpenOptions::new().append(true).create(true).open(history) {
+            file.write_all(out.as_ref());
+        }
+    }
+
     fn term_size(&mut self, cols: usize, rows: usize) {
         self.size = (cols, rows);
     }