feat: add features for each type

itconfig/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "itconfig"
-version = "0.10.0"
+version = "0.10.1"
 authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
 description = "Easy build a configs from environment variables and use it in globally."
 categories = ["config", "web-programming"]
@@ -22,6 +22,53 @@ maintenance = { status = "actively-developed" }
 failure = { version = "0.1.6", features = ["derive"]}
 
 [features]
-default = ['macro']
+default = ["macro", "numbers", "bool"]
 macro = []
 
+numbers = [
+    "int",
+    "uint",
+    "float"
+]
+
+int = [
+    "i8",
+    "i16",
+    "i32",
+    "i64",
+    "i128",
+    "isize",
+]
+
+uint = [
+    "u8",
+    "u16",
+    "u32",
+    "u64",
+    "u128",
+    "usize",
+]
+
+float = [
+    "f32",
+    "f64",
+]
+
+i8    = []
+i16   = []
+i32   = []
+i64   = []
+i128  = []
+isize = []
+
+u8    = []
+u16   = []
+u32   = []
+u64   = []
+u128  = []
+usize = []
+
+f32   = []
+f64   = []
+
+bool  = []

itconfig/README.md

@@ -96,6 +96,7 @@ fn main() {
 * [ ] Common configuration for namespace variables
 
 
+
 ## License
 
 [MIT] © [Ice Temple](https://github.com/icetemple)

itconfig/src/envstr.rs

@@ -1,5 +1,4 @@
 use std::ops::Deref;
-use std::str::FromStr;
 
 
 #[doc(hidden)]
@@ -29,10 +28,11 @@ impl<T> ToEnvString for T
 
 #[doc(hidden)]
 macro_rules! from_env_string_numbers_impl {
-    ($($ty:ty),+) => {
+    ($($ty:ty => $feature:expr),+) => {
         $(
+            #[cfg(feature = $feature)]
             impl FromEnvString for $ty {
-                type Err = <$ty as FromStr>::Err;
+                type Err = <$ty as std::str::FromStr>::Err;
 
                 #[inline]
                 fn from_env_string(s: &EnvString) -> Result<Self, Self::Err> {
@@ -44,12 +44,24 @@ macro_rules! from_env_string_numbers_impl {
 }
 
 from_env_string_numbers_impl![
-    i8, i16, i32, i64, i128, isize,
+    i8    => "i8",
-    u8, u16, u32, u64, u128, usize,
+    i16   => "i16",
-    f32, f64
+    i32   => "i32",
+    i64   => "i64",
+    i128  => "i128",
+    isize => "isize",
+    u8    => "u8",
+    u16   => "u16",
+    u32   => "u32",
+    u64   => "u64",
+    u128  => "u128",
+    usize => "usize",
+    f32   => "f32",
+    f64   => "f64"
 ];
 
 
+#[cfg(feature = "bool")]
 impl FromEnvString for bool {
     type Err = ();