Restructure program

This commit also includes changes to devices according to the latest
devices specification, in particular the math and system devices.

1 files changed, 95 insertions, 60 deletions

diff --git a/src/devices/file_device.rs b/src/devices/file_device.rs
index 61966b1..f8d8fa0 100644
--- a/src/devices/file_device.rs
+++ b/src/devices/file_device.rs
@@ -1,20 +1,4 @@
-mod bedrock_file_path;
-mod bedrock_path_buffer;
-mod buffered_file;
-mod directory_listing;
-mod entry;
-mod operations;
-
-use buffered_file::BufferedFile;
-use bedrock_file_path::BedrockFilePath;
-use bedrock_path_buffer::BedrockPathBuffer;
-use directory_listing::DirectoryListing;
-use entry::{Entry, EntryType};
-use operations::{create_file, move_entry, delete_entry};
-
-use bedrock_core::*;
-
-use std::path::{Component, Path, PathBuf};
+use crate::*;
 
 
 pub struct FileDevice {
@@ -39,6 +23,59 @@ pub struct FileDevice {
     pub enable_delete: bool,
 }
 
+
+impl Device for FileDevice {
+    fn read(&mut self, port: u8) -> u8 {
+        match port {
+            0x0 => read_b!(self.entry.is_some()),
+            0x1 => read_b!(self.success),
+            0x2 => self.path_buffer.read(),
+            0x3 => read_b!(self.entry_type()),
+            0x4 => self.read_byte(),
+            0x5 => self.read_byte(),
+            0x6 => self.read_child_path(),
+            0x7 => read_b!(self.child_type()),
+            0x8 => read_hh!(self.pointer()),
+            0x9 => read_hl!(self.pointer()),
+            0xa => read_lh!(self.pointer()),
+            0xb => read_ll!(self.pointer()),
+            0xc => read_hh!(self.length()),
+            0xd => read_hl!(self.length()),
+            0xe => read_lh!(self.length()),
+            0xf => read_ll!(self.length()),
+            _ => unreachable!(),
+        }
+    }
+
+    fn write(&mut self, port: u8, value: u8) -> Option<Signal> {
+        match port {
+            0x0 => self.write_to_entry_port(value),
+            0x1 => self.write_to_action_port(value),
+            0x2 => self.path_buffer.set_pointer(value),
+            0x3 => self.ascend_to_parent(),
+            0x4 => self.write_byte(value),
+            0x5 => self.write_byte(value),
+            0x6 => self.set_child_path(value),
+            0x7 => self.descend_to_child(),
+            0x8 => write_hh!(self.pointer_write, value),
+            0x9 => write_hl!(self.pointer_write, value),
+            0xa => write_lh!(self.pointer_write, value),
+            0xb => {write_ll!(self.pointer_write, value); self.commit_pointer()},
+            0xc => write_hh!(self.length_write, value),
+            0xd => write_hl!(self.length_write, value),
+            0xe => write_lh!(self.length_write, value),
+            0xf => {write_ll!(self.length_write, value); self.commit_length()},
+            _ => unreachable!(),
+        };
+        return None;
+    }
+
+    fn wake(&mut self) -> bool {
+        false
+    }
+}
+
+
 impl FileDevice {
     pub fn new() -> Self {
         #[cfg(target_family = "unix")]
@@ -279,59 +316,57 @@ impl FileDevice {
     }
 }
 
+
 impl Drop for FileDevice {
     fn drop(&mut self) {
         self.flush();
     }
 }
 
-impl Device for FileDevice {
-    fn read(&mut self, port: u8) -> u8 {
-        match port {
-            0x0 => read_b!(self.entry.is_some()),
-            0x1 => read_b!(self.success),
-            0x2 => self.path_buffer.read(),
-            0x3 => read_b!(self.entry_type()),
-            0x4 => self.read_byte(),
-            0x5 => self.read_byte(),
-            0x6 => self.read_child_path(),
-            0x7 => read_b!(self.child_type()),
-            0x8 => read_hh!(self.pointer()),
-            0x9 => read_hl!(self.pointer()),
-            0xa => read_lh!(self.pointer()),
-            0xb => read_ll!(self.pointer()),
-            0xc => read_hh!(self.length()),
-            0xd => read_hl!(self.length()),
-            0xe => read_lh!(self.length()),
-            0xf => read_ll!(self.length()),
-            _ => unreachable!(),
+
+/// Create a new file if it doesn't already exist, returning true if successful.
+pub fn create_file(destination: &Path) -> bool {
+    if entry_exists(destination) {
+        false
+    } else {
+        if let Some(parent_path) = destination.parent() {
+            let _ = std::fs::create_dir_all(parent_path);
         }
+        std::fs::OpenOptions::new().write(true).create_new(true)
+            .open(destination).is_ok()
     }
+}
 
-    fn write(&mut self, port: u8, value: u8) -> Option<Signal> {
-        match port {
-            0x0 => self.write_to_entry_port(value),
-            0x1 => self.write_to_action_port(value),
-            0x2 => self.path_buffer.set_pointer(value),
-            0x3 => self.ascend_to_parent(),
-            0x4 => self.write_byte(value),
-            0x5 => self.write_byte(value),
-            0x6 => self.set_child_path(value),
-            0x7 => self.descend_to_child(),
-            0x8 => write_hh!(self.pointer_write, value),
-            0x9 => write_hl!(self.pointer_write, value),
-            0xa => write_lh!(self.pointer_write, value),
-            0xb => {write_ll!(self.pointer_write, value); self.commit_pointer()},
-            0xc => write_hh!(self.length_write, value),
-            0xd => write_hl!(self.length_write, value),
-            0xe => write_lh!(self.length_write, value),
-            0xf => {write_ll!(self.length_write, value); self.commit_length()},
-            _ => unreachable!(),
-        };
-        return None;
+/// Move an entry from one location to another, returning true if successful.
+pub fn move_entry(source: &Path, destination: &Path) -> bool {
+    if !entry_exists(source) || entry_exists(destination) {
+        return false;
     }
+    std::fs::rename(source, destination).is_ok()
+}
 
-    fn wake(&mut self) -> bool {
-        false
+/// Delete an entry, returning true if successful.
+pub fn delete_entry(source: &Path) -> bool {
+    use std::fs::{remove_file, remove_dir_all};
+    use std::io::ErrorKind;
+
+    match remove_file(source) {
+        Ok(_) => true,
+        Err(error) => match error.kind() {
+            ErrorKind::NotFound => true,
+            ErrorKind::IsADirectory => match remove_dir_all(source) {
+                Ok(_) => true,
+                Err(error) => match error.kind() {
+                    ErrorKind::NotFound => true,
+                    _ => false,
+                }
+            }
+            _ => false,
+        }
     }
 }
+
+/// Returns true if an entry already exists at the given path.
+fn entry_exists(source: &Path) -> bool {
+    std::fs::metadata(source).is_ok()
+}