feat: add lazy static

Closes #13

itconfig-tests/Cargo.toml

@@ -14,8 +14,9 @@ criterion = "0.3.1"
 lazy_static = "1.4.0"
 
 [features]
-default = ["meta_namespace"]
+default = ["meta_namespace", "static"]
 meta_namespace = []
+static = ["itconfig/static"]
 
 [[bench]]
 name = "main_benches"

itconfig-tests/benches/main_benches.rs

@@ -3,11 +3,13 @@ use std::env;
 
 #[macro_use]
 extern crate lazy_static;
+#[macro_use]
+extern crate itconfig;
 
 
 
-fn setup_env_var(initial: &String) {
+fn setup_env_var(key: &'static str, initial: String) {
-    env::set_var("TEST", initial);
+    env::set_var(key, initial);
 }
 
 
@@ -26,33 +28,66 @@ fn lazy_get_env() -> u32 {
 
 
 fn source_vs_lazy(c: &mut Criterion) {
-    let source = Fun::new("source", |b, initial: &String| {
+    setup_env_var("TEST", "1".to_string());
-        setup_env_var(initial);
-        let int: u32 = initial.parse().unwrap();
 
+    let source = Fun::new("source", |b, _| {
         b.iter(move || {
-            assert_eq!(source_get_env(), int)
+            assert_eq!(source_get_env(), 1)
         })
     });
-    let lazy = Fun::new("lazy", |b, initial: &String| {
+    let lazy = Fun::new("lazy", |b, _| {
-        setup_env_var(initial);
-        let int: u32 = initial.parse().unwrap();
-
         b.iter(move || {
-            assert_eq!(lazy_get_env(), int);
+            assert_eq!(lazy_get_env(), 1);
         })
     });
 
-    let funcs = vec![source, lazy];
+    c.bench_functions("get_env", vec![source, lazy], 0);
-
-    c.bench_functions("get_env", funcs, "1".to_string());
 }
 
 
+fn source_macro_vs_lazy_macro(c: &mut Criterion) {
+    config! {
+        TEST: &'static str,
+        TEST_WITH_DEFAULT: &'static str => "default",
+
+        static LAZY_TEST: &'static str,
+        static LAZY_TEST_WITH_DEFAULT: &'static str => "default",
+    }
+
+    setup_env_var("TEST", "test".to_string());
+    setup_env_var("LAZY_TEST", "test".to_string());
+
+    let source = Fun::new("source", |b, _| {
+        b.iter(move || {
+            assert_eq!(cfg::TEST(), "test");
+        })
+    });
+    let lazy = Fun::new("lazy", |b, _| {
+        b.iter(move || {
+            assert_eq!(cfg::LAZY_TEST(), "test");
+        })
+    });
+    let source_with_default = Fun::new("source_with_default", |b, _| {
+        b.iter(move || {
+            assert_eq!(cfg::TEST_WITH_DEFAULT(), "default");
+        })
+    });
+    let lazy_with_default = Fun::new("lazy_with_default", |b, _| {
+        b.iter(move || {
+            assert_eq!(cfg::LAZY_TEST_WITH_DEFAULT(), "default");
+        })
+    });
+
+    let funcs = vec![source, lazy, source_with_default, lazy_with_default];
+
+    c.bench_functions("macro", funcs, 0);
+}
+
 
 criterion_group! {
     benches,
     source_vs_lazy,
+    source_macro_vs_lazy_macro,
 }
 
 criterion_main!(benches);

itconfig-tests/tests/config_macro.rs

@@ -422,3 +422,51 @@ fn concatenated_environment_variable_in_namespace() {
     );
     assert_eq!(env::var("CONCAT_ENVVAR"), Err(VarError::NotPresent));
 }
+
+
+#[test]
+#[cfg(feature = "static")]
+fn static_variables() {
+    config! {
+        static STATIC_STR => "test",
+        static STATIC_STRING: String => "test",
+        static STATIC_I8: i8 => 1,
+        static STATIC_I16: i16 => 1,
+        static STATIC_I32: i32 => 1,
+        static STATIC_I64: i64 => 1,
+        static STATIC_I128: i128 => 1,
+        static STATIC_ISIZE: isize => 1,
+        static STATIC_U8: u8 => 1,
+        static STATIC_U16: u16 => 1,
+        static STATIC_U32: u32 => 1,
+        static STATIC_U64: u64 => 1,
+        static STATIC_U128: u128 => 1,
+        static STATIC_USIZE: usize => 1,
+        static STATIC_F32: f32 => 1,
+        static STATIC_F64: f64 => 1,
+        static STATIC_CONCAT_VARIABLE < (
+            "static ",
+            STATIC_CONCAT_PART => "part",
+        ),
+    }
+
+    cfg::init();
+
+    assert_eq!(cfg::STATIC_STR(), "test");
+    assert_eq!(cfg::STATIC_STRING(), "test".to_string());
+    assert_eq!(cfg::STATIC_I8(), 1);
+    assert_eq!(cfg::STATIC_I16(), 1);
+    assert_eq!(cfg::STATIC_I32(), 1);
+    assert_eq!(cfg::STATIC_I64(), 1);
+    assert_eq!(cfg::STATIC_I128(), 1);
+    assert_eq!(cfg::STATIC_ISIZE(), 1);
+    assert_eq!(cfg::STATIC_U8(), 1);
+    assert_eq!(cfg::STATIC_U16(), 1);
+    assert_eq!(cfg::STATIC_U32(), 1);
+    assert_eq!(cfg::STATIC_U64(), 1);
+    assert_eq!(cfg::STATIC_U128(), 1);
+    assert_eq!(cfg::STATIC_USIZE(), 1);
+    assert_eq!(cfg::STATIC_F32(), 1.0);
+    assert_eq!(cfg::STATIC_F64(), 1.0);
+    assert_eq!(cfg::STATIC_CONCAT_VARIABLE(), "static part".to_string())
+}

itconfig/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "itconfig"
-version = "0.10.2"
+version = "0.11.0"
 authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
 description = "Easy build a configs from environment variables and use it in globally."
 categories = ["config", "web-programming"]
@@ -16,11 +16,14 @@ readme = "README.md"
 
 [dependencies]
 failure = { version = "0.1.6", features = ["derive"]}
+lazy_static = { version = "1.4.0", optional = true }
 serde_json = { version = "1.0.44", optional = true }
 
 [features]
-default = ["macro", "primitives"]
+default = ["macro", "primitives", "static"]
+
 macro = []
+static = ["lazy_static"]
 
 array = ["serde_json"]
 

itconfig/src/envstr.rs

@@ -119,6 +119,15 @@ impl FromEnvString for String {
 }
 
 
+impl FromEnvString for &'static str {
+    type Err = ();
+
+    fn from_env_string(s: &EnvString) -> Result<Self, Self::Err> {
+        Ok(Box::leak(s.0.clone().into_boxed_str()))
+    }
+}
+
+
 #[doc(hidden)]
 #[derive(Debug, PartialEq, Clone)]
 pub struct EnvString(String);

itconfig/src/lib.rs

@@ -87,12 +87,14 @@
 
 
 // Rustc lints.
-#![deny(unused_imports)]
+//#![deny(unused_imports)]
 
 /////////////////////////////////////////////////////////////////////////////
 
 #[macro_use]
 extern crate failure;
+#[cfg(feature = "static")]
+extern crate lazy_static;
 
 mod enverr;
 mod getenv;
@@ -108,7 +110,7 @@ pub mod prelude {
 
 
 #[cfg(feature = "macro")]
-#[allow(unused_imports)]
+//#[allow(unused_imports)]
 #[macro_use]
 mod r#macro;
 #[cfg(feature = "macro")]

itconfig/src/macro.rs

@@ -301,6 +301,14 @@ macro_rules! __itconfig_parse_module {
 }
 
 
+#[macro_export]
+#[doc(hidden)]
+macro_rules! __itconfig_get_ty_or_default {
+    () => { &'static str };
+    ($ty:ty) => { $ty };
+}
+
+
 #[macro_export]
 #[doc(hidden)]
 macro_rules! __itconfig_parse_variables {
@@ -329,6 +337,30 @@ macro_rules! __itconfig_parse_variables {
         }
     };
 
+    // Find static concatenated variable
+    (
+        tokens = [
+            $(#$meta:tt)*
+            static $name:ident < ($($inner:tt)+),
+            $($rest:tt)*
+        ],
+        $($args:tt)*
+    ) => {
+        __itconfig_parse_variables! {
+            current_variable = {
+                unparsed_meta = [$(#$meta)*],
+                meta = [],
+                unparsed_concat = [$($inner)+],
+                concat = [],
+                name = $name,
+                ty = String,
+                is_static = true,
+            },
+            tokens = [$($rest)*],
+            $($args)*
+        }
+    };
+
     // Find concatenated variable
     (
         tokens = [
@@ -346,17 +378,18 @@ macro_rules! __itconfig_parse_variables {
                 concat = [],
                 name = $name,
                 ty = String,
+                is_static = false,
             },
             tokens = [$($rest)*],
             $($args)*
         }
     };
 
-    // Find variable
+    // Find static variable
     (
         tokens = [
             $(#$meta:tt)*
-            $name:ident : $ty:ty$( => $default:expr)?,
+            static $name:ident $(: $ty:ty)? $(=> $default:expr)?,
             $($rest:tt)*
         ],
         $($args:tt)*
@@ -368,7 +401,33 @@ macro_rules! __itconfig_parse_variables {
                 unparsed_concat = [],
                 concat = [],
                 name = $name,
-                ty = $ty,
+                ty = __itconfig_get_ty_or_default!($($ty)?),
+                is_static = true,
+                $(default = $default,)?
+            },
+            tokens = [$($rest)*],
+            $($args)*
+        }
+    };
+
+    // Find variable
+    (
+        tokens = [
+            $(#$meta:tt)*
+            $name:ident $(: $ty:ty)? $(=> $default:expr)?,
+            $($rest:tt)*
+        ],
+        $($args:tt)*
+    ) => {
+        __itconfig_parse_variables! {
+            current_variable = {
+                unparsed_meta = [$(#$meta)*],
+                meta = [],
+                unparsed_concat = [],
+                concat = [],
+                name = $name,
+                ty = __itconfig_get_ty_or_default!($($ty)?),
+                is_static = false,
                 $(default = $default,)?
             },
             tokens = [$($rest)*],
@@ -523,6 +582,9 @@ macro_rules! __itconfig_impl_namespace {
             meta = $var_meta:tt,
             concat = $var_concat:tt,
             name = $var_name:ident,
+            $(env_name = $env_name:expr,)?
+            ty = $ty:ty,
+            is_static = $is_static:ident,
             $($variable:tt)*
         },)*],
         namespaces = [$({
@@ -543,6 +605,8 @@ macro_rules! __itconfig_impl_namespace {
         $(#$meta)*
         pub mod $mod_name {
             #![allow(non_snake_case)]
+            #[cfg(feature = "static")]
+            use lazy_static::lazy_static;
 
             $(__itconfig_impl_namespace! {
                 variables = $ns_variable,
@@ -567,6 +631,9 @@ macro_rules! __itconfig_impl_namespace {
                 concat = $var_concat,
                 name = $var_name,
                 env_prefix = $env_prefix,
+                $(env_name = $env_name,)?
+                ty = $ty,
+                is_static = $is_static,
                 $($variable)*
             })*
         }
@@ -630,37 +697,74 @@ macro_rules! __itconfig_variable {
 
     // Add method for env variable
     (
-        meta = [$(#$meta:tt,)*],
+        meta = $meta:tt,
         concat = $concat:tt,
         name = $name:ident,
         env_prefix = $env_prefix:expr,
         env_name = $env_name:expr,
         ty = $ty:ty,
+        is_static = $is_static:ident,
         $(default = $default:expr,)?
     ) => {
-        $(#$meta)*
+        __itconfig_variable!(
-        pub fn $name() -> $ty {
+            @wrap
-            __itconfig_variable! {
+            is_static = $is_static,
+            meta = $meta,
+            name = $name,
+            ty = $ty,
+            value = __itconfig_variable!(
                 @inner
                 concat = $concat,
                 env_name = $env_name,
                 $(default = $default,)?
-            }
+            ),
-        }
+        );
     };
 
+    // Wrap static variables
+    (
+        @wrap
+        is_static = true,
+        meta = [$(#$meta:tt,)*],
+        name = $name:ident,
+        ty = $ty:ty,
+        value = $value:expr,
+    ) => (
+        $(#$meta)*
+        pub fn $name() -> $ty {
+            lazy_static! {
+                static ref $name: $ty = $value;
+            }
+
+            (*$name).clone()
+        }
+    );
+
+    // Wrap functions
+    (
+        @wrap
+        is_static = false,
+        meta = [$(#$meta:tt,)*],
+        name = $name:ident,
+        ty = $ty:ty,
+        value = $value:expr,
+    ) => (
+        $(#$meta)*
+        pub fn $name() -> $ty { $value }
+    );
+
     // Concatenate function body
     (
         @inner
         concat = [$($concat:expr,)+],
         env_name = $env_name:expr,
         $($args:tt)*
-    ) => (
+    ) => ({
         let value_parts: Vec<String> = vec!($($concat),+);
         let value = value_parts.join("");
         std::env::set_var($env_name, value.as_str());
         value
-    );
+    });
 
     // Env without default
     (