- replace anyhow with thiserror

Cargo.toml

@@ -1,13 +1,14 @@
 [package]
 name = "tiffwrite"
-version = "2025.8.1"
+version = "2025.9.0"
 edition = "2024"
 rust-version = "1.85.1"
 authors = ["Wim Pomp <w.pomp@nki.nl>"]
-license = "MIT"
+license = "MIT OR Apache-2.0"
 description = "Write BioFormats/ImageJ compatible tiffs with zstd compression in parallel."
 homepage = "https://github.com/wimpomp/tiffwrite"
 repository = "https://github.com/wimpomp/tiffwrite"
+documentation = "https://docs.rs/tiffwrite"
 readme = "README.md"
 keywords = ["bioformats", "tiff", "ndarray", "zstd", "fiji"]
 categories = ["multimedia::images", "science"]
@@ -17,7 +18,6 @@ name = "tiffwrite"
 crate-type = ["cdylib", "rlib"]
 
 [dependencies]
-anyhow = "1.0.98"
 colorcet = "0.2.1"
 colorgrad = "0.7.2"
 chrono = "0.4.41"
@@ -25,9 +25,10 @@ css-color = "0.2.8"
 flate2 = "1.1.1"
 ndarray = "0.16.1"
 num = "0.4.3"
-rayon = "1.10.0"
-zstd = "0.13.3"
 numpy = { version = "0.25.0", optional = true }
+rayon = "1.10.0"
+thiserror = "2.0.16"
+zstd = "0.13.3"
 
 [dependencies.pyo3]
 version = "0.25.1"

LICENSE-APACHE

@@ -0,0 +1,176 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
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+
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+   other entities that control, are controlled by, or are under common
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+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
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+   "Object" form shall mean any form resulting from mechanical
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+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
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+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS

src/error.rs

@@ -0,0 +1,14 @@
+use thiserror::Error;
+
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("io error: {0}")]
+    IO(#[from] std::io::Error),
+    #[error("could not parse color: {0}")]
+    ColorParse(String),
+    #[error("colorcet error: {0}")]
+    ColorCet(#[from] colorcet::ColorcetError),
+    #[error("could not covert ColorMap into LinearGradient")]
+    Conversion
+}

src/lib.rs

@@ -1,7 +1,7 @@
 #[cfg(feature = "python")]
 mod py;
+mod error;
 
-use anyhow::{Result, anyhow};
 use chrono::Utc;
 use colorcet::ColorMap;
 use colorgrad::{Gradient, LinearGradient};
@@ -23,6 +23,7 @@ use std::{
 };
 use zstd::zstd_safe::CompressionLevel;
 use zstd::{DEFAULT_COMPRESSION_LEVEL, stream::Encoder};
+use crate::error::Error;
 
 const TAG_SIZE: usize = 20;
 const OFFSET_SIZE: usize = 8;
@@ -59,7 +60,7 @@ impl IFD {
         }
     }
 
-    fn write(&mut self, ijtifffile: &mut IJTiffFile, where_to_write_offset: u64) -> Result<u64> {
+    fn write(&mut self, ijtifffile: &mut IJTiffFile, where_to_write_offset: u64) -> Result<u64, Error> {
         let mut tags = self.tags.drain().collect::<Vec<_>>();
         tags.sort();
         ijtifffile.file.seek(SeekFrom::End(0))?;
@@ -322,7 +323,7 @@ impl Tag {
         c as u64
     }
 
-    fn write_tag(&mut self, ijtifffile: &mut IJTiffFile) -> Result<()> {
+    fn write_tag(&mut self, ijtifffile: &mut IJTiffFile) -> Result<(), Error> {
         self.offset = ijtifffile.file.stream_position()?;
         ijtifffile.file.write_all(&self.code.to_le_bytes())?;
         ijtifffile.file.write_all(&self.ttype.to_le_bytes())?;
@@ -338,7 +339,7 @@ impl Tag {
         Ok(())
     }
 
-    fn write_data(&self, ijtifffile: &mut IJTiffFile) -> Result<()> {
+    fn write_data(&self, ijtifffile: &mut IJTiffFile) -> Result<(), Error> {
         if self.bytes.len() > OFFSET_SIZE {
             ijtifffile.file.seek(SeekFrom::End(0))?;
             let offset = ijtifffile.write(&self.bytes)?;
@@ -493,7 +494,7 @@ impl CompressedFrame {
         slice: (usize, usize, usize, usize),
         tile_width: usize,
         tile_length: usize,
-    ) -> Result<W>
+    ) -> Result<W, Error>
     where
         W: Write,
         T: Bytes,
@@ -524,7 +525,7 @@ impl CompressedFrame {
         slice: (usize, usize, usize, usize),
         tile_width: usize,
         tile_length: usize,
-    ) -> Result<Vec<u8>>
+    ) -> Result<Vec<u8>, Error>
     where
         T: Bytes,
     {
@@ -539,7 +540,7 @@ impl CompressedFrame {
         tile_width: usize,
         tile_length: usize,
         compression_level: i32,
-    ) -> Result<Vec<u8>>
+    ) -> Result<Vec<u8>, Error>
     where
         T: Bytes,
     {
@@ -678,7 +679,7 @@ impl Drop for IJTiffFile {
 impl IJTiffFile {
     /// create new tifffile from path, use it's save() method to save frames
     /// the file is finalized when it goes out of scope
-    pub fn new<P: AsRef<Path>>(path: P) -> Result<Self> {
+    pub fn new<P: AsRef<Path>>(path: P) -> Result<Self, Error> {
         let mut file = OpenOptions::new()
             .create(true)
             .truncate(true)
@@ -711,7 +712,8 @@ impl IJTiffFile {
     }
 
     /// set colors from css color names and #C01085
-    pub fn set_colors<S: AsRef<str>>(&mut self, colors: &[S]) -> Result<()> {
+    /// (see [css_color](https://crates.io/crates/css-color))
+    pub fn set_colors<S: AsRef<str>>(&mut self, colors: &[S]) -> Result<(), Error> {
         self.colors = Colors::Colors(
             colors
                 .iter()
@@ -735,17 +737,18 @@ impl IJTiffFile {
                             (255.0 * c.green).round() as u8,
                             (255.0 * c.blue).round() as u8,
                         ]),
-                        Err(_) => Err(anyhow!("could not parse color: {}", c)),
+                        Err(_) => Err(Error::ColorParse(c.to_string())),
                     }
                 })
-                .collect::<Result<Vec<_>>>()?,
+                .collect::<Result<Vec<_>, Error>>()?,
         );
         Ok(())
     }
 
-    pub fn set_colormap<S: AsRef<str>>(&mut self, name: S) -> Result<()> {
+    /// set colormap from named colormap (see [colorcet](https://crates.io/crates/colorcet))
+    pub fn set_colormap<S: AsRef<str>>(&mut self, name: S) -> Result<(), Error> {
         let name = name.as_ref();
-        let colormap: LinearGradient = name.parse::<ColorMap>()?.try_into()?;
+        let colormap: LinearGradient = name.parse::<ColorMap>()?.try_into().map_err(|_| Error::Conversion)?;
         let mut colormap = colormap
             .colors(256)
             .into_iter()
@@ -832,7 +835,7 @@ impl IJTiffFile {
         hasher.finish()
     }
 
-    fn hash_check(&mut self, bytes: &Vec<u8>, offset: u64) -> Result<bool> {
+    fn hash_check(&mut self, bytes: &Vec<u8>, offset: u64) -> Result<bool, Error> {
         let current_offset = self.file.stream_position()?;
         self.file.seek(SeekFrom::Start(offset))?;
         let mut buffer = vec![0; bytes.len()];
@@ -842,7 +845,7 @@ impl IJTiffFile {
         Ok(same)
     }
 
-    fn write(&mut self, bytes: &Vec<u8>) -> Result<u64> {
+    fn write(&mut self, bytes: &Vec<u8>) -> Result<u64, Error> {
         let hash = IJTiffFile::hash(&bytes);
         if self.hashes.contains_key(&hash)
             && self.hash_check(bytes, *self.hashes.get(&hash).unwrap())?
@@ -860,7 +863,7 @@ impl IJTiffFile {
     }
 
     /// save a 2d array to the tiff file at channel c, slice z, and time t
-    pub fn save<'a, A, T>(&mut self, frame: A, c: usize, z: usize, t: usize) -> Result<()>
+    pub fn save<'a, A, T>(&mut self, frame: A, c: usize, z: usize, t: usize) -> Result<(), Error>
     where
         A: AsArray<'a, T, Ix2>,
         T: Bytes + Clone + Send + Sync + 'static,
@@ -882,7 +885,7 @@ impl IJTiffFile {
         Ok(())
     }
 
-    fn collect_threads(&mut self, block: bool) -> Result<()> {
+    fn collect_threads(&mut self, block: bool) -> Result<(), Error> {
         for (c, z, t) in self.threads.keys().cloned().collect::<Vec<_>>() {
             if block || self.threads[&(c, z, t)].is_finished() {
                 if let Some(thread) = self.threads.remove(&(c, z, t)) {
@@ -893,7 +896,7 @@ impl IJTiffFile {
         Ok(())
     }
 
-    fn write_frame(&mut self, frame: CompressedFrame, c: usize, z: usize, t: usize) -> Result<()> {
+    fn write_frame(&mut self, frame: CompressedFrame, c: usize, z: usize, t: usize) -> Result<(), Error> {
         let mut offsets = Vec::new();
         let mut bytecounts = Vec::new();
         for tile in frame.bytes {
@@ -940,7 +943,7 @@ impl IJTiffFile {
         c
     }
 
-    fn close(&mut self) -> Result<()> {
+    fn close(&mut self) -> Result<(), Error> {
         self.collect_threads(true)?;
         let mut c_size = 1;
         let mut z_size = 1;
@@ -1074,7 +1077,7 @@ mod tests {
 
     #[test]
     /// An example of generating julia fractals.
-    fn julia_test() -> Result<()> {
+    fn julia_test() -> Result<(), Error> {
         let imgx = 800;
         let imgy = 600;
 

src/py.rs

@@ -4,6 +4,12 @@ use numpy::PyReadonlyArray2;
 use pyo3::exceptions::PyValueError;
 use pyo3::prelude::*;
 
+impl From<crate::error::Error> for PyErr {
+    fn from(err: crate::error::Error) -> PyErr {
+        PyErr::new::<PyValueError, _>(err.to_string())
+    }
+}
+
 #[pyclass(subclass)]
 #[pyo3(name = "Tag")]
 #[derive(Clone, Debug)]