Share dir_files between segments through Context (#16)

src/context.rs

@@ -1,30 +1,52 @@
 use clap::ArgMatches;
 use std::env;
+use std::fs;
 use std::path::PathBuf;
 
 pub struct Context<'a> {
     pub current_dir: PathBuf,
+    pub dir_files: Vec<PathBuf>,
     pub arguments: ArgMatches<'a>,
 }
 
 impl<'a> Context<'a> {
     pub fn new(arguments: ArgMatches) -> Context {
-        // TODO: Currently gets the physical directory. Get the logical directory.
         let current_dir = env::current_dir().expect("Unable to identify current directory.");
-
-        Context {
-            current_dir,
-            arguments,
-        }
+        Context::new_with_dir(arguments, current_dir)
     }
 
+    #[allow(dead_code)]
     pub fn new_with_dir<T>(arguments: ArgMatches, dir: T) -> Context
     where
         T: Into<PathBuf>,
     {
+        // TODO: Currently gets the physical directory. Get the logical directory.
+        let current_dir = Context::expand_tilde(dir.into());
+
+        let dir_files = fs::read_dir(&current_dir)
+            .unwrap_or_else(|_| {
+                panic!(
+                    "Unable to read current directory: {}",
+                    current_dir.to_string_lossy()
+                )
+            })
+            .filter_map(Result::ok)
+            .map(|entry| entry.path())
+            .collect::<Vec<PathBuf>>();
+
         Context {
-            current_dir: dir.into(),
+            current_dir,
             arguments,
+            dir_files,
         }
     }
+
+    /// Convert a `~` in a path to the home directory
+    fn expand_tilde(dir: PathBuf) -> PathBuf {
+        if dir.starts_with("~") {
+            let without_home = dir.strip_prefix("~").unwrap();
+            return dirs::home_dir().unwrap().join(without_home);
+        }
+        dir
+    }
 }