remove derive_more (#60)

* Initial go at things

* Finish off Frame

* Finish off removing all of derive_more

* Fix clippy complaint

* Actually fix CI!

Cargo.toml

@@ -15,7 +15,6 @@ categories = ["compression"]
 [dependencies]
 byteorder = { version = "1.5", default-features = false }
 twox-hash = { version = "1.6", default-features = false, optional = true }
-derive_more = { version = "0.99", default-features = false, features = ["display", "from"] }
 
 [dev-dependencies]
 criterion = "0.5"
@@ -24,7 +23,7 @@ rand = { version = "0.8.5", features = ["small_rng"] }
 [features]
 default = ["hash", "std"]
 hash = ["dep:twox-hash"]
-std = ["derive_more/error"]
+std = []
 
 [[bench]]
 name = "reversedbitreader_bench"

src/blocks/literals_section.rs

@@ -14,21 +14,51 @@ pub enum LiteralsSectionType {
     Treeless,
 }
 
-#[derive(Debug, derive_more::Display, derive_more::From)]
-#[cfg_attr(feature = "std", derive(derive_more::Error))]
+#[derive(Debug)]
 #[non_exhaustive]
 pub enum LiteralsSectionParseError {
-    #[display(fmt = "Illegal literalssectiontype. Is: {got}, must be in: 0, 1, 2, 3")]
     IllegalLiteralSectionType { got: u8 },
-    #[display(fmt = "{_0:?}")]
-    #[from]
     GetBitsError(GetBitsError),
-    #[display(
-        fmt = "Not enough byte to parse the literals section header. Have: {have}, Need: {need}"
-    )]
     NotEnoughBytes { have: usize, need: u8 },
 }
 
+#[cfg(feature = "std")]
+impl std::error::Error for LiteralsSectionParseError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            LiteralsSectionParseError::GetBitsError(source) => Some(source),
+            _ => None,
+        }
+    }
+}
+impl core::fmt::Display for LiteralsSectionParseError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            LiteralsSectionParseError::IllegalLiteralSectionType { got } => {
+                write!(
+                    f,
+                    "Illegal literalssectiontype. Is: {}, must be in: 0, 1, 2, 3",
+                    got
+                )
+            }
+            LiteralsSectionParseError::GetBitsError(e) => write!(f, "{:?}", e),
+            LiteralsSectionParseError::NotEnoughBytes { have, need } => {
+                write!(
+                    f,
+                    "Not enough byte to parse the literals section header. Have: {}, Need: {}",
+                    have, need,
+                )
+            }
+        }
+    }
+}
+
+impl From<GetBitsError> for LiteralsSectionParseError {
+    fn from(val: GetBitsError) -> Self {
+        Self::GetBitsError(val)
+    }
+}
+
 impl core::fmt::Display for LiteralsSectionType {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
         match self {

src/blocks/sequence_section.rs

@@ -55,16 +55,29 @@ impl Default for SequencesHeader {
     }
 }
 
-#[derive(Debug, derive_more::Display)]
-#[cfg_attr(feature = "std", derive(derive_more::Error))]
+#[derive(Debug)]
 #[non_exhaustive]
 pub enum SequencesHeaderParseError {
-    #[display(
-        fmt = "source must have at least {need_at_least} bytes to parse header; got {got} bytes"
-    )]
     NotEnoughBytes { need_at_least: u8, got: usize },
 }
 
+#[cfg(feature = "std")]
+impl std::error::Error for SequencesHeaderParseError {}
+
+impl core::fmt::Display for SequencesHeaderParseError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            SequencesHeaderParseError::NotEnoughBytes { need_at_least, got } => {
+                write!(
+                    f,
+                    "source must have at least {} bytes to parse header; got {} bytes",
+                    need_at_least, got,
+                )
+            }
+        }
+    }
+}
+
 impl SequencesHeader {
     pub fn new() -> SequencesHeader {
         SequencesHeader {

src/decoding/bit_reader.rs

@@ -3,19 +3,47 @@ pub struct BitReader<'s> {
     source: &'s [u8],
 }
 
-#[derive(Debug, derive_more::Display)]
-#[cfg_attr(feature = "std", derive(derive_more::Error))]
+#[derive(Debug)]
 #[non_exhaustive]
 pub enum GetBitsError {
-    #[display(
-        fmt = "Cant serve this request. The reader is limited to {limit} bits, requested {num_requested_bits} bits"
-    )]
     TooManyBits {
         num_requested_bits: usize,
         limit: u8,
     },
-    #[display(fmt = "Can't read {requested} bits, only have {remaining} bits left")]
-    NotEnoughRemainingBits { requested: usize, remaining: usize },
+    NotEnoughRemainingBits {
+        requested: usize,
+        remaining: usize,
+    },
+}
+
+#[cfg(feature = "std")]
+impl std::error::Error for GetBitsError {}
+
+impl core::fmt::Display for GetBitsError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            GetBitsError::TooManyBits {
+                num_requested_bits,
+                limit,
+            } => {
+                write!(
+                    f,
+                    "Cant serve this request. The reader is limited to {} bits, requested {} bits",
+                    limit, num_requested_bits,
+                )
+            }
+            GetBitsError::NotEnoughRemainingBits {
+                requested,
+                remaining,
+            } => {
+                write!(
+                    f,
+                    "Can\'t read {} bits, only have {} bits left",
+                    requested, remaining,
+                )
+            }
+        }
+    }
 }
 
 impl<'s> BitReader<'s> {