Add an ability to resolve a file path to a historian instance and page object. Add a command for running resolve-links on a file directly, for use in an editor.

src/lib.rs

@@ -58,6 +58,36 @@ impl Historian {
         }
     }
 
+    pub fn resolve_from_file(file_path_str: &str) -> Option<(Historian, Page)> {
+        let file_path: PathBuf = std::path::absolute(file_path_str).unwrap();
+        match fs::metadata(&file_path) {
+            Err(_) => None,
+            Ok(metadata) => {
+                if !metadata.is_file() {
+                    None
+                } else {
+                    let mut wiki_path = file_path.parent().unwrap();
+                    while wiki_path.parent() != None {
+                        let toml_path = wiki_path.join(DEFAULT_TOML_FILENAME);
+                        match fs::metadata(&toml_path) {
+                            Err(_) => {
+                                wiki_path = wiki_path.parent().unwrap();
+                            },
+                            Ok(_) => {
+                                let historian = Historian::new(wiki_path.to_str().unwrap().to_owned());
+                                let relative_page_path = diff_paths(&file_path, &wiki_path).unwrap();
+                                return relative_page_path.to_str()
+                                    .and_then(|page_path| historian.resolve_to_page(page_path))
+                                    .map(|page| (historian, page));
+                            }
+                        };
+                    }
+                    None
+                }
+            }
+        }
+    }
+
     pub fn resolve_to_page(&self, name: &str) -> Option<Page> {
         let mut file_path = self.source_root.clone().join(Path::new(name));
         match fs::metadata(&file_path) {