Support overriding diff options in project config (& for individual units) (#263)

* Support loading diff options from project config

* Support per-unit option overrides

objdiff-core/src/config/mod.rs

@@ -1,6 +1,7 @@
 pub mod path;
 
 use alloc::{
+    borrow::Cow,
     collections::BTreeMap,
     string::{String, ToString},
     vec::Vec,
@@ -45,6 +46,8 @@ pub struct ProjectConfig {
     pub units: Option<Vec<ProjectObject>>,
     #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub progress_categories: Option<Vec<ProjectProgressCategory>>,
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
+    pub options: Option<ProjectOptions>,
 }
 
 impl ProjectConfig {
@@ -116,6 +119,8 @@ pub struct ProjectObject {
     pub metadata: Option<ProjectObjectMetadata>,
     #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
     pub symbol_mappings: Option<BTreeMap<String, String>>,
+    #[cfg_attr(feature = "serde", serde(skip_serializing_if = "Option::is_none"))]
+    pub options: Option<ProjectOptions>,
 }
 
 #[derive(Default, Clone)]
@@ -143,6 +148,15 @@ pub struct ProjectProgressCategory {
     pub name: String,
 }
 
+pub type ProjectOptions = BTreeMap<String, ProjectOptionValue>;
+
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize), serde(untagged))]
+pub enum ProjectOptionValue {
+    Bool(bool),
+    String(String),
+}
+
 impl ProjectObject {
     pub fn name(&self) -> &str {
         if let Some(name) = &self.name {
@@ -179,6 +193,8 @@ impl ProjectObject {
     pub fn auto_generated(&self) -> Option<bool> {
         self.metadata.as_ref().and_then(|m| m.auto_generated)
     }
+
+    pub fn options(&self) -> Option<&ProjectOptions> { self.options.as_ref() }
 }
 
 #[derive(Default, Clone, Eq, PartialEq)]
@@ -310,3 +326,47 @@ pub fn build_globset(vec: &[Glob]) -> Result<GlobSet, globset::Error> {
     }
     builder.build()
 }
+
+#[cfg(feature = "any-arch")]
+pub fn apply_project_options(
+    diff_config: &mut crate::diff::DiffObjConfig,
+    options: &ProjectOptions,
+) -> Result<()> {
+    use core::str::FromStr;
+
+    use crate::diff::{ConfigEnum, ConfigPropertyId, ConfigPropertyKind};
+
+    let mut result = Ok(());
+    for (key, value) in options.iter() {
+        let property_id = ConfigPropertyId::from_str(key)
+            .map_err(|()| anyhow!("Invalid configuration property: {key}"))?;
+        let value = match value {
+            ProjectOptionValue::Bool(value) => Cow::Borrowed(if *value { "true" } else { "false" }),
+            ProjectOptionValue::String(value) => Cow::Borrowed(value.as_str()),
+        };
+        if diff_config.set_property_value_str(property_id, &value).is_err() {
+            if result.is_err() {
+                // Already returning an error, skip further errors
+                continue;
+            }
+            let mut expected = String::new();
+            match property_id.kind() {
+                ConfigPropertyKind::Boolean => expected.push_str("true, false"),
+                ConfigPropertyKind::Choice(variants) => {
+                    for (idx, variant) in variants.iter().enumerate() {
+                        if idx > 0 {
+                            expected.push_str(", ");
+                        }
+                        expected.push_str(variant.value);
+                    }
+                }
+            }
+            result = Err(anyhow!(
+                "Invalid value for {}. Expected one of: {}",
+                property_id.name(),
+                expected
+            ));
+        }
+    }
+    result
+}