Added model for knowledge of the game's state

Will be useful to track deductions that have already been made.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/files.rs b/src/files.rs
index 7f3daed..0810a4e 100644
--- a/src/files.rs
+++ b/src/files.rs
@@ -1,15 +1,21 @@
 use json;
+use serde_json;
+
 use std::io::prelude::*;
 use std::fs::File;
 use std::path::PathBuf;
 
 use actions::*;
+use knowledge::*;
 
 const STATE_FILE: &'static str = "state.json";
 
 const COMMAND_FILE: &'static str = "command.txt";
 const PLACE_FILE: &'static str = "place.txt";
 
+const KNOWLEDGE_FILE: &'static str = "knowledge-state.json";
+
+
 pub fn read_file(working_dir: &PathBuf) -> Result<json::JsonValue, String> {
     let state_path = working_dir.join(STATE_FILE);
     let mut file = File::open(state_path.as_path()).map_err(|e| e.to_string())?;
@@ -34,3 +40,18 @@ pub fn write_action(working_dir: &PathBuf, is_place_phase: bool, action: Action)
     
     Ok(())
 }
+
+pub fn read_knowledge() -> Result<Knowledge, String> {
+    let mut file = File::open(KNOWLEDGE_FILE).map_err(|e| e.to_string())?;
+    let mut content = String::new();
+    file.read_to_string(&mut content).map_err(|e| e.to_string())?; 
+    serde_json::from_str(content.as_ref()).map_err(|e| e.to_string())
+}
+
+pub fn write_knowledge(knowledge: &Knowledge) -> Result<(), String> {
+    let json = serde_json::to_string(knowledge).map_err(|e| e.to_string())?;
+    let mut file = File::create(KNOWLEDGE_FILE).map_err(|e| e.to_string())?;
+    write!(file, "{}", json).map_err(|e| e.to_string())?;
+
+    Ok(())
+}