From 00c2fd9057d9e0b40901d671d517f190541a15f8 Mon Sep 17 00:00:00 2001
From: Julio Biason <julio.biason@diaxcapital.com.br>
Date: Tue, 20 Oct 2020 13:43:20 -0300
Subject: [PATCH] "Database" skeleton

---
 Cargo.lock      | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |  3 +++
 src/database.rs | 54 +++++++++++++++++++++++++++++++++++++++++
 src/main.rs     | 10 +++++++-
 4 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 src/database.rs

diff --git a/Cargo.lock b/Cargo.lock
index 6cd4ef7..73da412 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -61,6 +61,44 @@ name = "nrp"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "serde",
+ "serde_derive",
+ "toml",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
+
+[[package]]
+name = "serde_derive"
+version = "1.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbd1ae72adb44aab48f325a02444a5fc079349a8d804c1fc922aed3f7454c74e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -69,6 +107,17 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "syn"
+version = "1.0.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea9c5432ff16d6152371f808fb5a871cd67368171b09bb21b43df8e4a47a3556"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -78,12 +127,27 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75cf45bb0bef80604d001caaec0d09da99611b3c0fd39d3080468875cdb65645"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "unicode-width"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
 [[package]]
 name = "vec_map"
 version = "0.8.1"
diff --git a/Cargo.toml b/Cargo.toml
index 464f0a2..f3f74dd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2018"
 
 [dependencies]
 clap = "2.33"
+toml = "0.5"
+serde = "*"
+serde_derive = "*"
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..92a5a3a
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,54 @@
+use std::collections::BTreeMap;
+use std::collections::LinkedList;
+use std::fs::File;
+use std::io::Read;
+
+use serde_derive::Deserialize;
+use serde_derive::Serialize;
+use toml;
+
+type WordStorage = BTreeMap<char, LinkedList<String>>;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Database {
+    adjectives: WordStorage,
+    metals: WordStorage,
+}
+
+pub enum DatabaseError {
+    InvalidFormat,
+}
+
+impl std::convert::From<std::io::Error> for DatabaseError {
+    fn from(_error: std::io::Error) -> DatabaseError {
+        DatabaseError::InvalidFormat
+    }
+}
+
+impl std::convert::From<toml::de::Error> for DatabaseError {
+    fn from(_error: toml::de::Error) -> DatabaseError {
+        DatabaseError::InvalidFormat
+    }
+}
+
+impl Database {
+    /// Create an empty database
+    fn empty() -> Self {
+        Database {
+            adjectives: WordStorage::new(),
+            metals: WordStorage::new(),
+        }
+    }
+
+    /// Load the database
+    pub fn load() -> Result<Self, DatabaseError> {
+        if let Ok(mut fp) = File::open("database.toml") {
+            let mut content = String::new();
+            fp.read_to_string(&mut content)?;
+            let data = toml::from_str(&content)?;
+            Ok(data)
+        } else {
+            Ok(Database::empty())
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index d8f54f3..2d18b46 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,10 +18,18 @@
 
 mod actions;
 mod args;
+mod database;
 
 fn main() {
     match args::parse() {
-        Ok(x) => println!("Ok: {:?}", x),
+        Ok(x) => {
+            println!("Ok: {:?}", x);
+            if let Ok(_db) = database::Database::load() {
+                println!("Has db");
+            } else {
+                println!("Do not has db");
+            }
+        }
         Err(x) => println!("Error {:?}", x),
     }
 }