46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
//! # GEGL
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//!
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//! > **Ad-hoc GEGL data structure library for Rust.**
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mod operations;
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pub use operations::*;
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pub use indexmap::indexmap;
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/// Type alias for a [`indexmap::IndexMap`] with static [`str`] keys and
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/// [`String`] values. The reason for [`indexmap`] is to preserve insertion
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/// order for simpler testing.
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pub type GeglData = indexmap::IndexMap<&'static str, String>;
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/// The [`GeglOperation`] trait defines a set of common functions for the
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/// individual operations to implement so they can be used with the GEGL CLI.
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pub trait GeglOperation: Default + std::fmt::Debug {
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/// Some GEGL operations will run infinitely unless you limit the buffer in
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/// some way, so all operations must indicate whether or not they should be
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/// followed by a crop operation.
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fn append_crop_operation(&self) -> bool;
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/// Creates the parameters for the graph to be used with the GEGL CLI.
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fn graph(&self, include_default_values: bool) -> Vec<String> {
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let mut graph = vec![self.name().to_string()];
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let defaults = Self::default().values();
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for (key, value) in self.values() {
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if !include_default_values && defaults.get(key) == Some(&value) {
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continue;
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}
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graph.push(format!("{key}={value}"));
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}
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graph
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}
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/// Returns the name of the operation, starting with `gegl:`.
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fn name(&self) -> &'static str;
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/// Returns the set of configured values for this operation.
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fn values(&self) -> GeglData;
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}
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