Add database skeleton

Cargo.lock

@@ -3,4 +3,60 @@
 [[package]]
 name = "avarice"
 version = "0.1.0"
+dependencies = [
+ "custom_error 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.59 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "custom_error"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "itoa"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "log"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "serde"
+version = "1.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "serde_json"
+version = "1.0.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+"checksum custom_error 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51ac5e99a7fea3ee8a03fa4721a47e2efd3fbb38358fc61192a54d4c6f866c12"
+"checksum itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "dc6f3ad7b9d11a0c00842ff8de1b60ee58661048eb8049ed33c73594f359d7e6"
+"checksum log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
+"checksum ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
+"checksum serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)" = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
+"checksum serde_json 1.0.59 (registry+https://github.com/rust-lang/crates.io-index)" = "dcac07dbffa1c65e7f816ab9eba78eb142c6d44410f4eeba1e26e4f5dfa56b95"

Cargo.toml

@@ -7,3 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+log = "0.4"
+serde_json = "1.0"
+custom_error = "1.8.0"

src/database/mod.rs

@@ -0,0 +1,112 @@
+use log::warn;
+use serde_json;
+use std::error::Error;
+use std::fs;
+use std::path;
+
+extern crate custom_error;
+use custom_error::custom_error;
+
+custom_error! {DatabaseError
+    NotDirectory{path: String} = "Path to database should point at the directory: {path}",
+}
+
+struct File {
+    name: String,
+    contents: serde_json::Value,
+}
+
+struct Group {
+    name: String,
+    files: Vec<File>,
+}
+
+struct Category {
+    name: String,
+    groups: Vec<Group>,
+}
+
+pub struct Database {
+    storage: path::PathBuf,
+    contents: Vec<Category>,
+}
+
+impl Database {
+    pub fn new(storage: &path::Path) -> Result<Database, Box<dyn Error>> {
+        if !storage.is_dir() {
+            return Err(Box::new(DatabaseError::NotDirectory {
+                path: storage.display().to_string(),
+            }));
+        }
+        let mut contents = Vec::new();
+        for entry in fs::read_dir(storage)? {
+            let entry = entry?;
+            let path = entry.path();
+            if !path.is_dir() {
+                warn!(
+                    r#"File {} found where only category directories are supposed to be"#,
+                    path.display()
+                );
+            } else {
+                let category = load_category(&path)?;
+                contents.push(category);
+            }
+        }
+        Ok(Database {
+            storage: storage.to_path_buf(),
+            contents,
+        })
+    }
+}
+
+fn load_category(category_path: &path::Path) -> Result<Category, Box<dyn Error>> {
+    let mut groups = Vec::new();
+    for entry in fs::read_dir(category_path)? {
+        let entry = entry?;
+        let path = entry.path();
+        if !path.is_dir() {
+            warn!(
+                r#"File {} found where only group directories are supposed to be"#,
+                path.display()
+            );
+        } else {
+            let group = load_group(&path)?;
+            groups.push(group);
+        }
+    }
+    Ok(Category {
+        name: get_file_name(category_path),
+        groups,
+    })
+}
+
+fn load_group(group_path: &path::Path) -> Result<Group, Box<dyn Error>> {
+    let mut files = Vec::new();
+    for entry in fs::read_dir(group_path)? {
+        let entry = entry?;
+        let path = entry.path();
+        if path.is_dir() {
+            warn!(
+                r#"Directory {} found where only data files are supposed to be"#,
+                path.display()
+            );
+        } else {
+            let file_contents = fs::read_to_string(&path)?;
+            files.push(File {
+                name: get_file_name(path.as_path()),
+                contents: serde_json::from_str(&file_contents)?,
+            });
+        }
+    }
+    Ok(Group {
+        name: get_file_name(group_path),
+        files,
+    })
+}
+
+fn get_file_name(path: &path::Path) -> String {
+    path.file_stem()
+        .and_then(|x| x.to_str())
+        .unwrap_or_default()
+        .to_string()
+}

src/main.rs

@@ -1,13 +1,13 @@
 use std::env;
 use std::path::Path;
-mod unreal_config;
+mod database;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
     let filename = &args[1];
-    let config = unreal_config::load_file(Path::new(filename));
+    let config = database::Database::new(Path::new(filename));
     match config {
-        Ok(config) => print!("{}", config),
+        Ok(db) => print!("ok"),
         _ => (),
     }
 }