From 532ba8381f4f4ca5ab25067d4f76a6c6ec75e1db Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Fri, 11 Dec 2020 19:13:00 +0100
Subject: [PATCH] read_value()/write_value(): put behind feature
 postcard-values

---
 Cargo.toml   | 8 ++++++--
 src/error.rs | 2 ++
 src/lib.rs   | 6 +++++-
 src/test.rs  | 5 +++++
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index cf8322c..8de9a3b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,11 @@ categories = ["embedded", "database"]
 license = "GPL-3"
 edition = "2018"
 
+[features]
+default = ["postcard-values"]
+postcard-values = ["postcard", "serde"]
+
 [dependencies]
 byteorder = { version = "1", default-features = false }
-serde = { version = "1.0", default-features = false }
-postcard = "0.5"
+serde = { version = "1.0", default-features = false, optional = true }
+postcard = { version = "0.5", optional = true }
diff --git a/src/error.rs b/src/error.rs
index c213fa4..701d076 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -4,7 +4,9 @@ use core::{fmt, str};
 pub enum Error<B> {
     Read(ReadError),
     Write(WriteError<B>),
+    #[cfg(feature = "postcard-values")]
     Encode(postcard::Error),
+    #[cfg(feature = "postcard-values")]
     Decode(postcard::Error),
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index bba7377..a209620 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 
 use core::{mem::size_of, str};
 use byteorder::{ByteOrder, BigEndian};
+#[cfg(feature = "postcard-values")]
 use serde::{Deserialize, Serialize};
 
 mod error;
@@ -59,10 +60,12 @@ impl<B: StoreBackend> Store<B> {
                       .map(|value| str::from_utf8(value)
                            .map_err(ReadError::Utf8Error)
                       )
-                      .transpose())
+                      .transpose()
+            )
     }
 
     /// read from `key`, decode with `postcard`
+    #[cfg(feature = "postcard-values")]
     pub fn read_value<'a, T: Deserialize<'a>>(&'a self, key: &str) -> Result<Option<T>, Error<B::Error>> {
         self.read(key)?
             .map(
@@ -159,6 +162,7 @@ impl<B: StoreBackend> Store<B> {
     }
 
     /// encode with `postcard`, write at `key`
+    #[cfg(feature = "postcard-values")]
     pub fn write_value<T: Serialize>(&mut self, key: &str, value: T) -> Result<(), Error<B::Error>> {
         let mut buf = [0; 64];
         let data = postcard::to_slice(&value, &mut buf)
diff --git a/src/test.rs b/src/test.rs
index 849bfb2..d7a914b 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -74,6 +74,7 @@ fn write_read_str_utf8() {
 }
 
 #[test]
+#[cfg(feature = "postcard-values")]
 fn write_read_value_str() {
     let mut store = make_store();
     store.write_value("foo", "bar").unwrap();
@@ -81,6 +82,7 @@ fn write_read_value_str() {
 }
 
 #[test]
+#[cfg(feature = "postcard-values")]
 fn write_read_value_u32() {
     let mut store = make_store();
     store.write_value("foo", 42005u32).unwrap();
@@ -88,6 +90,7 @@ fn write_read_value_u32() {
 }
 
 #[test]
+#[cfg(feature = "postcard-values")]
 fn write_read_value_i64() {
     let mut store = make_store();
     store.write_value("foo", -99999999i64).unwrap();
@@ -95,6 +98,7 @@ fn write_read_value_i64() {
 }
 
 #[test]
+#[cfg(feature = "postcard-values")]
 fn write_read_value_f32() {
     let mut store = make_store();
     store.write_value("foo", 3.75e17f32).unwrap();
@@ -102,6 +106,7 @@ fn write_read_value_f32() {
 }
 
 #[test]
+#[cfg(feature = "postcard-values")]
 fn write_read_value_f64() {
     let mut store = make_store();
     store.write_value("foo", -1.999e-13f64).unwrap();