Indicate which types/functions/etc. require the std feature in the docs

Cargo.toml

@@ -10,6 +10,9 @@ license      = "MIT OR Apache-2.0"
 keywords     = ["esp-idf", "partition", "partition-table"]
 categories   = ["embedded", "parsing"]
 
+[package.metadata.docs.rs]
+rustdoc-args = ["--cfg", "docsrs"]
+
 [dependencies]
 csv         = { version = "1.1.6",   optional = true }
 deku        = { version = "0.15.1",  optional = true }

src/error.rs

@@ -68,21 +68,25 @@ pub enum Error {
 
     /// An error which originated in the `csv` package
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     #[cfg_attr(feature = "std", error(transparent))]
     CsvError(#[from] csv::Error),
 
     /// An error which originated in the `deku` package
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     #[cfg_attr(feature = "std", error(transparent))]
     DekuError(#[from] deku::DekuError),
 
     /// An error which occurred while trying to convert bytes to a String
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     #[cfg_attr(feature = "std", error(transparent))]
     FromUtf8Error(#[from] std::string::FromUtf8Error),
 
     /// An error which originated in the `std::io` module
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     #[cfg_attr(feature = "std", error(transparent))]
     IoError(#[from] std::io::Error),
 }

src/lib.rs

@@ -6,6 +6,7 @@
 //! <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/partition-tables.html>
 
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(feature = "std")]
 use core::ops::Rem;
@@ -60,6 +61,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Attempt to parse either a binary or CSV partition table from the given
     /// input.
     ///
@@ -84,6 +86,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Attempt to parse a binary partition table from the given bytes.
     ///
     /// For more information on the partition table format see:  
@@ -136,6 +139,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Attempt to parse a CSV partition table from the given string.
     ///
     /// For more information on the partition table format see:  
@@ -196,6 +200,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Convert a partition table to binary
     pub fn to_bin(&self) -> Result<Vec<u8>, Error> {
         let mut result = Vec::with_capacity(PARTITION_TABLE_SIZE);
@@ -221,6 +226,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Convert a partition table to a CSV string
     pub fn to_csv(&self) -> Result<String, Error> {
         let mut csv = String::new();
@@ -246,6 +252,7 @@ impl PartitionTable {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Validate a partition table
     fn validate(&self) -> Result<(), Error> {
         // There must be at least one partition with type 'app'

src/partition/mod.rs

@@ -80,6 +80,7 @@ impl Type {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Return a `String` stating which subtypes are allowed for the given type.
     ///
     /// This is useful for error handling in dependent packages.
@@ -309,6 +310,7 @@ impl Partition {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Write a record to the provided binary writer
     pub fn write_bin<W>(&self, writer: &mut W) -> std::io::Result<()>
     where
@@ -331,6 +333,7 @@ impl Partition {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
     /// Write a record to the provided [`csv::Writer`]
     pub fn write_csv<W>(&self, csv: &mut csv::Writer<W>) -> std::io::Result<()>
     where