feat: init migra lib

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
 members = [
+    "migra",
     "migra-cli"
 ]

migra-cli/Cargo.toml

@@ -14,6 +14,7 @@ readme = "../README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+migra = { version = "0", path = "../migra" }
 cfg-if = "1.0"
 structopt = "0.3"
 serde = { version = "1.0", features = ["derive"] }

migra/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "migra"
+version = "0.1.0"
+authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

migra/src/lib.rs

@@ -0,0 +1,5 @@
+#![deny(missing_debug_implementations)]
+#![deny(clippy::all, clippy::pedantic)]
+#![allow(clippy::missing_errors_doc)]
+
+pub mod migration;

migra/src/migration.rs

@@ -0,0 +1,87 @@
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
+pub struct Migration {
+    name: String,
+    upgrade_sql_content: Option<String>,
+    downgrade_sql_content: Option<String>,
+}
+
+impl Migration {
+    #[must_use]
+    pub fn new(name: &str) -> Self {
+        Migration {
+            name: name.to_owned(),
+            ..Migration::default()
+        }
+    }
+
+    #[must_use]
+    pub fn with_upgrade(name: &str, up_content: &str) -> Self {
+        Migration {
+            name: name.to_owned(),
+            upgrade_sql_content: Some(up_content.to_owned()),
+            ..Migration::default()
+        }
+    }
+
+    #[must_use]
+    pub fn with_upgrade_and_downgrade(name: &str, up_content: &str, down_content: &str) -> Self {
+        Migration {
+            name: name.to_owned(),
+            upgrade_sql_content: Some(up_content.to_owned()),
+            downgrade_sql_content: Some(down_content.to_owned()),
+        }
+    }
+
+    #[must_use]
+    pub fn name(&self) -> &String {
+        &self.name
+    }
+
+    #[must_use]
+    pub fn upgrade_sql_content(&self) -> Option<&String> {
+        self.upgrade_sql_content.as_ref()
+    }
+
+    #[must_use]
+    pub fn downgrade_sql_content(&self) -> Option<&String> {
+        self.downgrade_sql_content.as_ref()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct List {
+    inner: Vec<Migration>,
+}
+
+impl<T: AsRef<str>> From<Vec<T>> for List {
+    fn from(list: Vec<T>) -> Self {
+        List {
+            inner: list.iter().map(AsRef::as_ref).map(Migration::new).collect(),
+        }
+    }
+}
+
+impl List {
+    #[must_use]
+    pub fn new() -> Self {
+        List { inner: Vec::new() }
+    }
+
+    pub fn push<T: AsRef<str>>(&mut self, name: &T) {
+        self.inner.push(Migration::new(name.as_ref()))
+    }
+
+    #[must_use]
+    pub fn contains(&self, name: &str) -> bool {
+        self.inner.iter().any(|migration| migration.name() == name)
+    }
+
+    #[must_use]
+    pub fn maybe_next<'a>(&self, name: &'a str) -> Option<&'a str> {
+        if self.contains(name) {
+            None
+        } else {
+            Some(name)
+        }
+    }
+}