Project configuration fixes & improvements

- Allow config to specify object "target_path" and "base_path" explicitly, rather than relying on relative path from the "target_dir" and "base_dir". Useful for more complex directory layouts.
- Fix watch_patterns in project config not using default.
- Fix "Rebuild on changes" not defaulting to true.
- Keep watching project config updates even when "Rebuild on changes" is false.
- Disable some configuration options when loaded from project config file.

Cargo.lock

@@ -840,9 +840,9 @@ dependencies = [
 
 [[package]]
 name = "cwdemangle"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b58d34a3a03cfe0a4ebfd03aeda6ee8a0f2e99bd3308476a8a89815add3ec373"
+checksum = "c251bc5553377b3dc85c7b9b3955cfc2eb5a7b5544cf65adc2d53c2a4c2f4162"
 dependencies = [
  "argh",
 ]
@@ -2457,7 +2457,7 @@ dependencies = [
 
 [[package]]
 name = "objdiff"
-version = "0.4.0"
+version = "0.4.1"
 dependencies = [
  "anyhow",
  "byteorder",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "objdiff"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2021"
 rust-version = "1.65"
 authors = ["Luke Street <luke@street.dev>"]
@@ -27,7 +27,7 @@ byteorder = "1.4.3"
 bytes = "1.4.0"
 cfg-if = "1.0.0"
 const_format = "0.2.31"
-cwdemangle = "0.1.5"
+cwdemangle = "0.1.6"
 dirs = "5.0.1"
 eframe = { version = "0.22.0", features = ["persistence"] }
 egui = "0.22.0"

README.md

@@ -50,8 +50,11 @@ file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it
 // objdiff.json
 {
   "custom_make": "ninja",
+
+  // Only required if objects use "path" instead of "target_path" and "base_path".
   "target_dir": "build/asm",
   "base_dir": "build/src",
+
   "build_target": true,
   "watch_patterns": [
     "*.c",
@@ -63,8 +66,15 @@ file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it
   ],
   "objects": [
     {
+      "name": "main/MetroTRK/mslsupp",
+
+      // Option 1: Relative to target_dir and base_dir
       "path": "MetroTRK/mslsupp.o",
-      "name": "MetroTRK/mslsupp",
+      // Option 2: Explicit paths from project root
+      // Useful for more complex directory layouts
+      "target_path": "build/asm/MetroTRK/mslsupp.o",
+      "base_path": "build/src/MetroTRK/mslsupp.o",
+      
       "reverse_fn_order": false
     },
     // ...
@@ -72,25 +82,43 @@ file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it
 }
 ```
 
-- `custom_make` _(optional)_: By default, objdiff will use `make` to build the project.  
-  If the project uses a different build system (e.g. `ninja`), specify it here.
-- `target_dir`: Relative from the root of the project, this where the "target" or "expected" objects are located.  
-  These are the **intended result** of the match.
-- `base_dir`: Relative from the root of the project, this is where the "base" or "actual" objects are located.  
-  These are objects built from the **current source code**.
-- `build_target`: If true, objdiff will tell the build system to build the target objects before diffing (e.g.
+`custom_make` _(optional)_: By default, objdiff will use `make` to build the project.  
+If the project uses a different build system (e.g. `ninja`), specify it here.
+
+`target_dir` _(optional)_: Relative from the root of the project, this where the "target" or "expected" objects are located.  
+These are the **intended result** of the match.
+
+`base_dir` _(optional)_: Relative from the root of the project, this is where the "base" or "actual" objects are located.  
+These are objects built from the **current source code**.
+
+`build_target`: If true, objdiff will tell the build system to build the target objects before diffing (e.g.
   `make path/to/target.o`).  
-  This is useful if the target objects are not built by default or can change based on project configuration or edits
-  to assembly files.  
-  Requires the build system to be configured properly.
-- `watch_patterns` _(optional)_: A list of glob patterns to watch for changes.
-  ([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))  
-  If any of these files change, objdiff will automatically rebuild the objects and re-compare them.
-- `objects` _(optional)_: If specified, objdiff will display a list of objects in the sidebar for easy navigation.
-    - `path`: Relative path to the object from the `target_dir` and `base_dir`.
-    - `name` _(optional)_: The name of the object in the UI. If not specified, the object's `path` will be used.
-    - `reverse_fn_order` _(optional)_: Displays function symbols in reversed order.  
-      Used to support MWCC's `-inline deferred` option, which reverses the order of functions in the object file.
+This is useful if the target objects are not built by default or can change based on project configuration or edits
+to assembly files.  
+Requires the build system to be configured properly.
+
+`watch_patterns` _(optional)_: A list of glob patterns to watch for changes.
+([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))  
+If any of these files change, objdiff will automatically rebuild the objects and re-compare them.  
+If not specified, objdiff will use the default patterns listed above.
+
+`objects` _(optional)_: If specified, objdiff will display a list of objects in the sidebar for easy navigation.
+
+> `name` _(optional)_: The name of the object in the UI. If not specified, the object's `path` will be used.
+> 
+> `path`: Relative path to the object from the `target_dir` and `base_dir`.  
+> Requires `target_dir` and `base_dir` to be specified.
+> 
+> `target_path`: Path to the target object from the project root.  
+> Required if `path` is not specified.
+> 
+> `base_path`: Path to the base object from the project root.  
+> Required if `path` is not specified.
+> 
+> `reverse_fn_order` _(optional)_: Displays function symbols in reversed order.  
+Used to support MWCC's `-inline deferred` option, which reverses the order of functions in the object file.
+
+
 
 ## License
 

src/app.rs

@@ -40,6 +40,18 @@ pub struct ViewState {
     pub show_project_config: bool,
 }
 
+/// The configuration for a single object file.
+#[derive(Clone, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
+pub struct ObjectConfig {
+    pub name: String,
+    pub target_path: PathBuf,
+    pub base_path: PathBuf,
+    pub reverse_fn_order: Option<bool>,
+}
+
+#[inline]
+fn bool_true() -> bool { true }
+
 #[derive(Default, Clone, serde::Deserialize, serde::Serialize)]
 pub struct AppConfig {
     pub custom_make: Option<String>,
@@ -47,9 +59,10 @@ pub struct AppConfig {
     pub project_dir: Option<PathBuf>,
     pub target_obj_dir: Option<PathBuf>,
     pub base_obj_dir: Option<PathBuf>,
-    pub obj_path: Option<String>,
+    pub selected_obj: Option<ObjectConfig>,
     pub build_target: bool,
-    pub watcher_enabled: bool,
+    #[serde(default = "bool_true")]
+    pub rebuild_on_changes: bool,
     pub auto_update_check: bool,
     pub watch_patterns: Vec<Glob>,
 
@@ -65,6 +78,8 @@ pub struct AppConfig {
     pub obj_change: bool,
     #[serde(skip)]
     pub queue_build: bool,
+    #[serde(skip)]
+    pub project_config_loaded: bool,
 }
 
 impl AppConfig {
@@ -72,7 +87,7 @@ impl AppConfig {
         self.project_dir = Some(path);
         self.target_obj_dir = None;
         self.base_obj_dir = None;
-        self.obj_path = None;
+        self.selected_obj = None;
         self.build_target = false;
         self.objects.clear();
         self.object_nodes.clear();
@@ -80,24 +95,25 @@ impl AppConfig {
         self.config_change = true;
         self.obj_change = true;
         self.queue_build = false;
+        self.project_config_loaded = false;
     }
 
     pub fn set_target_obj_dir(&mut self, path: PathBuf) {
         self.target_obj_dir = Some(path);
-        self.obj_path = None;
+        self.selected_obj = None;
         self.obj_change = true;
         self.queue_build = false;
     }
 
     pub fn set_base_obj_dir(&mut self, path: PathBuf) {
         self.base_obj_dir = Some(path);
-        self.obj_path = None;
+        self.selected_obj = None;
         self.obj_change = true;
         self.queue_build = false;
     }
 
-    pub fn set_obj_path(&mut self, path: String) {
-        self.obj_path = Some(path);
+    pub fn set_selected_obj(&mut self, object: ObjectConfig) {
+        self.selected_obj = Some(object);
         self.obj_change = true;
         self.queue_build = false;
     }
@@ -258,19 +274,19 @@ impl App {
 
         if config.obj_change {
             *diff_state = Default::default();
-            if config.obj_path.is_some() {
+            if config.selected_obj.is_some() {
                 config.queue_build = true;
             }
             config.obj_change = false;
         }
 
-        if self.modified.swap(false, Ordering::Relaxed) {
+        if self.modified.swap(false, Ordering::Relaxed) && config.rebuild_on_changes {
             config.queue_build = true;
         }
 
         // Don't clear `queue_build` if a build is running. A file may have been modified during
         // the build, so we'll start another build after the current one finishes.
-        if config.queue_build && config.obj_path.is_some() && !jobs.is_running(Job::ObjDiff) {
+        if config.queue_build && config.selected_obj.is_some() && !jobs.is_running(Job::ObjDiff) {
             jobs.push(start_build(self.config.clone()));
             config.queue_build = false;
         }

src/config.rs

@@ -6,7 +6,7 @@ use std::{
 use anyhow::{Context, Result};
 use globset::{Glob, GlobSet, GlobSetBuilder};
 
-use crate::app::AppConfig;
+use crate::{app::AppConfig, views::config::DEFAULT_WATCH_PATTERNS};
 
 #[derive(Default, Clone, serde::Deserialize)]
 #[serde(default)]
@@ -15,7 +15,7 @@ pub struct ProjectConfig {
     pub target_dir: Option<PathBuf>,
     pub base_dir: Option<PathBuf>,
     pub build_target: bool,
-    pub watch_patterns: Vec<Glob>,
+    pub watch_patterns: Option<Vec<Glob>>,
     #[serde(alias = "units")]
     pub objects: Vec<ProjectObject>,
 }
@@ -23,10 +23,24 @@ pub struct ProjectConfig {
 #[derive(Default, Clone, serde::Deserialize)]
 pub struct ProjectObject {
     pub name: Option<String>,
-    pub path: PathBuf,
+    pub path: Option<PathBuf>,
+    pub target_path: Option<PathBuf>,
+    pub base_path: Option<PathBuf>,
     pub reverse_fn_order: Option<bool>,
 }
 
+impl ProjectObject {
+    pub fn name(&self) -> &str {
+        if let Some(name) = &self.name {
+            name
+        } else if let Some(path) = &self.path {
+            path.to_str().unwrap_or("[invalid path]")
+        } else {
+            "[unknown]"
+        }
+    }
+}
+
 #[derive(Clone)]
 pub enum ProjectObjectNode {
     File(String, ProjectObject),
@@ -53,11 +67,22 @@ fn find_dir<'a>(
     unreachable!();
 }
 
-fn build_nodes(objects: &[ProjectObject]) -> Vec<ProjectObjectNode> {
+fn build_nodes(
+    objects: &[ProjectObject],
+    project_dir: &PathBuf,
+    target_obj_dir: &Option<PathBuf>,
+    base_obj_dir: &Option<PathBuf>,
+) -> Vec<ProjectObjectNode> {
     let mut nodes = vec![];
     for object in objects {
         let mut out_nodes = &mut nodes;
-        let path = object.name.as_ref().map(Path::new).unwrap_or(&object.path);
+        let path = if let Some(name) = &object.name {
+            Path::new(name)
+        } else if let Some(path) = &object.path {
+            path
+        } else {
+            continue;
+        };
         if let Some(parent) = path.parent() {
             for component in parent.components() {
                 if let Component::Normal(name) = component {
@@ -66,8 +91,23 @@ fn build_nodes(objects: &[ProjectObject]) -> Vec<ProjectObjectNode> {
                 }
             }
         }
+        let mut object = object.clone();
+        if let (Some(target_obj_dir), Some(path), None) =
+            (target_obj_dir, &object.path, &object.target_path)
+        {
+            object.target_path = Some(target_obj_dir.join(path));
+        } else if let Some(path) = &object.target_path {
+            object.target_path = Some(project_dir.join(path));
+        }
+        if let (Some(base_obj_dir), Some(path), None) =
+            (base_obj_dir, &object.path, &object.base_path)
+        {
+            object.base_path = Some(base_obj_dir.join(path));
+        } else if let Some(path) = &object.base_path {
+            object.base_path = Some(project_dir.join(path));
+        }
         let filename = path.file_name().unwrap().to_str().unwrap().to_string();
-        out_nodes.push(ProjectObjectNode::File(filename, object.clone()));
+        out_nodes.push(ProjectObjectNode::File(filename, object));
     }
     nodes
 }
@@ -84,10 +124,14 @@ pub fn load_project_config(config: &mut AppConfig) -> Result<()> {
         config.target_obj_dir = project_config.target_dir.map(|p| project_dir.join(p));
         config.base_obj_dir = project_config.base_dir.map(|p| project_dir.join(p));
         config.build_target = project_config.build_target;
-        config.watch_patterns = project_config.watch_patterns;
+        config.watch_patterns = project_config.watch_patterns.unwrap_or_else(|| {
+            DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect()
+        });
         config.watcher_change = true;
         config.objects = project_config.objects;
-        config.object_nodes = build_nodes(&config.objects);
+        config.object_nodes =
+            build_nodes(&config.objects, project_dir, &config.target_obj_dir, &config.base_obj_dir);
+        config.project_config_loaded = true;
     }
     Ok(())
 }

src/jobs/objdiff.rs

@@ -1,6 +1,6 @@
 use std::{path::Path, process::Command, str::from_utf8, sync::mpsc::Receiver};
 
-use anyhow::{Context, Error, Result};
+use anyhow::{anyhow, Context, Error, Result};
 use time::OffsetDateTime;
 
 use crate::{
@@ -76,47 +76,51 @@ fn run_build(
     config: AppConfigRef,
 ) -> Result<Box<ObjDiffResult>> {
     let config = config.read().map_err(|_| Error::msg("Failed to lock app config"))?.clone();
-    let obj_path = config.obj_path.as_ref().ok_or_else(|| Error::msg("Missing obj path"))?;
+    let obj_config = config.selected_obj.as_ref().ok_or_else(|| Error::msg("Missing obj path"))?;
     let project_dir =
         config.project_dir.as_ref().ok_or_else(|| Error::msg("Missing project dir"))?;
-    let mut target_path = config
-        .target_obj_dir
-        .as_ref()
-        .ok_or_else(|| Error::msg("Missing target obj dir"))?
-        .to_owned();
-    target_path.push(obj_path);
-    let mut base_path =
-        config.base_obj_dir.as_ref().ok_or_else(|| Error::msg("Missing base obj dir"))?.to_owned();
-    base_path.push(obj_path);
-    let target_path_rel = target_path
-        .strip_prefix(project_dir)
-        .context("Failed to create relative target obj path")?;
-    let base_path_rel =
-        base_path.strip_prefix(project_dir).context("Failed to create relative base obj path")?;
+    let target_path_rel = obj_config.target_path.strip_prefix(project_dir).map_err(|_| {
+        anyhow!(
+            "Target path '{}' doesn't begin with '{}'",
+            obj_config.target_path.display(),
+            project_dir.display()
+        )
+    })?;
+    let base_path_rel = obj_config.base_path.strip_prefix(project_dir).map_err(|_| {
+        anyhow!(
+            "Base path '{}' doesn't begin with '{}'",
+            obj_config.base_path.display(),
+            project_dir.display()
+        )
+    })?;
 
     let total = if config.build_target { 5 } else { 4 };
     let first_status = if config.build_target {
-        update_status(status, format!("Building target {obj_path}"), 0, total, &cancel)?;
+        update_status(status, format!("Building target {}", target_path_rel.display()), 0, total, &cancel)?;
         run_make(project_dir, target_path_rel, &config)
     } else {
         BuildStatus { success: true, log: String::new() }
     };
 
-    update_status(status, format!("Building base {obj_path}"), 1, total, &cancel)?;
+    update_status(status, format!("Building base {}", base_path_rel.display()), 1, total, &cancel)?;
     let second_status = run_make(project_dir, base_path_rel, &config);
 
     let time = OffsetDateTime::now_utc();
 
     let mut first_obj = if first_status.success {
-        update_status(status, format!("Loading target {obj_path}"), 2, total, &cancel)?;
-        Some(elf::read(&target_path)?)
+        update_status(status, format!("Loading target {}", target_path_rel.display()), 2, total, &cancel)?;
+        Some(elf::read(&obj_config.target_path).with_context(|| {
+            format!("Failed to read object '{}'", obj_config.target_path.display())
+        })?)
     } else {
         None
     };
 
     let mut second_obj = if second_status.success {
-        update_status(status, format!("Loading base {obj_path}"), 3, total, &cancel)?;
-        Some(elf::read(&base_path)?)
+        update_status(status, format!("Loading base {}", base_path_rel.display()), 3, total, &cancel)?;
+        Some(elf::read(&obj_config.base_path).with_context(|| {
+            format!("Failed to read object '{}'", obj_config.base_path.display())
+        })?)
     } else {
         None
     };

src/views/config.rs

@@ -17,7 +17,7 @@ use globset::Glob;
 use self_update::cargo_crate_version;
 
 use crate::{
-    app::{AppConfig, AppConfigRef},
+    app::{AppConfig, AppConfigRef, ObjectConfig},
     config::{ProjectObject, ProjectObjectNode},
     jobs::{
         check_update::{start_check_update, CheckUpdateResult},
@@ -79,7 +79,7 @@ impl ConfigViewState {
     }
 }
 
-const DEFAULT_WATCH_PATTERNS: &[&str] = &[
+pub const DEFAULT_WATCH_PATTERNS: &[&str] = &[
     "*.c", "*.cp", "*.cpp", "*.cxx", "*.h", "*.hp", "*.hpp", "*.hxx", "*.s", "*.S", "*.asm",
     "*.inc", "*.py", "*.yml", "*.txt", "*.json",
 ];
@@ -129,7 +129,7 @@ pub fn config_ui(
         selected_wsl_distro,
         target_obj_dir,
         base_obj_dir,
-        obj_path,
+        selected_obj,
         auto_update_check,
         objects,
         object_nodes,
@@ -205,9 +205,9 @@ pub fn config_ui(
         }
     });
 
-    if let (Some(base_dir), Some(target_dir)) = (base_obj_dir, target_obj_dir) {
-        let mut new_build_obj = obj_path.clone();
-        if objects.is_empty() {
+    let mut new_selected_obj = selected_obj.clone();
+    if objects.is_empty() {
+        if let (Some(base_dir), Some(target_dir)) = (base_obj_dir, target_obj_dir) {
             if ui.button("Select object").clicked() {
                 if let Some(path) = rfd::FileDialog::new()
                     .set_directory(&target_dir)
@@ -215,88 +215,99 @@ pub fn config_ui(
                     .pick_file()
                 {
                     if let Ok(obj_path) = path.strip_prefix(&base_dir) {
-                        new_build_obj = Some(obj_path.display().to_string());
+                        let target_path = target_dir.join(obj_path);
+                        new_selected_obj = Some(ObjectConfig {
+                            name: obj_path.display().to_string(),
+                            target_path,
+                            base_path: path,
+                            reverse_fn_order: None,
+                        });
                     } else if let Ok(obj_path) = path.strip_prefix(&target_dir) {
-                        new_build_obj = Some(obj_path.display().to_string());
+                        let base_path = base_dir.join(obj_path);
+                        new_selected_obj = Some(ObjectConfig {
+                            name: obj_path.display().to_string(),
+                            target_path: path,
+                            base_path,
+                            reverse_fn_order: None,
+                        });
                     }
                 }
             }
-            if let Some(obj) = obj_path {
+            if let Some(obj) = selected_obj {
                 ui.label(
-                    RichText::new(&*obj)
+                    RichText::new(&obj.name)
                         .color(appearance.replace_color)
                         .family(FontFamily::Monospace),
                 );
             }
         } else {
-            let had_search = !state.object_search.is_empty();
-            egui::TextEdit::singleline(&mut state.object_search).hint_text("Filter").ui(ui);
+            ui.colored_label(appearance.delete_color, "Missing project settings");
+        }
+    } else {
+        let had_search = !state.object_search.is_empty();
+        egui::TextEdit::singleline(&mut state.object_search).hint_text("Filter").ui(ui);
 
-            let mut root_open = None;
-            let mut node_open = NodeOpen::Default;
-            ui.horizontal(|ui| {
-                if ui.small_button("⏶").on_hover_text_at_pointer("Collapse all").clicked() {
-                    root_open = Some(false);
-                    node_open = NodeOpen::Close;
-                }
-                if ui.small_button("⏷").on_hover_text_at_pointer("Expand all").clicked() {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Open;
-                }
-                if ui
-                    .add_enabled(obj_path.is_some(), egui::Button::new("⌖").small())
-                    .on_hover_text_at_pointer("Current object")
-                    .clicked()
-                {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Object;
-                }
-            });
-            if state.object_search.is_empty() {
-                if had_search {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Object;
-                }
-            } else if !had_search {
+        let mut root_open = None;
+        let mut node_open = NodeOpen::Default;
+        ui.horizontal(|ui| {
+            if ui.small_button("⏶").on_hover_text_at_pointer("Collapse all").clicked() {
+                root_open = Some(false);
+                node_open = NodeOpen::Close;
+            }
+            if ui.small_button("⏷").on_hover_text_at_pointer("Expand all").clicked() {
                 root_open = Some(true);
                 node_open = NodeOpen::Open;
             }
-
-            CollapsingHeader::new(RichText::new("🗀 Objects").font(FontId {
-                size: appearance.ui_font.size,
-                family: appearance.code_font.family.clone(),
-            }))
-            .open(root_open)
-            .default_open(true)
-            .show(ui, |ui| {
-                let mut nodes = Cow::Borrowed(object_nodes);
-                if !state.object_search.is_empty() {
-                    let search = state.object_search.to_ascii_lowercase();
-                    nodes = Cow::Owned(
-                        object_nodes.iter().filter_map(|node| filter_node(node, &search)).collect(),
-                    );
-                }
-
-                ui.style_mut().wrap = Some(false);
-                for node in nodes.iter() {
-                    display_node(ui, &mut new_build_obj, node, appearance, node_open);
-                }
-            });
-        }
-
-        if new_build_obj != *obj_path {
-            if let Some(obj) = new_build_obj {
-                // Will set obj_changed, which will trigger a rebuild
-                config_guard.set_obj_path(obj);
+            if ui
+                .add_enabled(selected_obj.is_some(), egui::Button::new("⌖").small())
+                .on_hover_text_at_pointer("Current object")
+                .clicked()
+            {
+                root_open = Some(true);
+                node_open = NodeOpen::Object;
             }
+        });
+        if state.object_search.is_empty() {
+            if had_search {
+                root_open = Some(true);
+                node_open = NodeOpen::Object;
+            }
+        } else if !had_search {
+            root_open = Some(true);
+            node_open = NodeOpen::Open;
         }
-        if config_guard.obj_path.is_some()
-            && ui.add_enabled(!state.build_running, egui::Button::new("Build")).clicked()
-        {
-            state.queue_build = true;
+
+        CollapsingHeader::new(RichText::new("🗀 Objects").font(FontId {
+            size: appearance.ui_font.size,
+            family: appearance.code_font.family.clone(),
+        }))
+        .open(root_open)
+        .default_open(true)
+        .show(ui, |ui| {
+            let mut nodes = Cow::Borrowed(object_nodes);
+            if !state.object_search.is_empty() {
+                let search = state.object_search.to_ascii_lowercase();
+                nodes = Cow::Owned(
+                    object_nodes.iter().filter_map(|node| filter_node(node, &search)).collect(),
+                );
+            }
+
+            ui.style_mut().wrap = Some(false);
+            for node in nodes.iter() {
+                display_node(ui, &mut new_selected_obj, node, appearance, node_open);
+            }
+        });
+    }
+    if new_selected_obj != *selected_obj {
+        if let Some(obj) = new_selected_obj {
+            // Will set obj_changed, which will trigger a rebuild
+            config_guard.set_selected_obj(obj);
         }
-    } else {
-        ui.colored_label(appearance.delete_color, "Missing project settings");
+    }
+    if config_guard.selected_obj.is_some()
+        && ui.add_enabled(!state.build_running, egui::Button::new("Build")).clicked()
+    {
+        state.queue_build = true;
     }
 
     ui.separator();
@@ -304,13 +315,13 @@ pub fn config_ui(
 
 fn display_object(
     ui: &mut egui::Ui,
-    obj_path: &mut Option<String>,
+    selected_obj: &mut Option<ObjectConfig>,
     name: &str,
     object: &ProjectObject,
     appearance: &Appearance,
 ) {
-    let path_string = object.path.to_string_lossy().to_string();
-    let selected = matches!(obj_path, Some(path) if path == &path_string);
+    let object_name = object.name();
+    let selected = matches!(selected_obj, Some(obj) if obj.name == object_name);
     let color = if selected { appearance.emphasized_text_color } else { appearance.text_color };
     if SelectableLabel::new(
         selected,
@@ -324,7 +335,12 @@ fn display_object(
     .ui(ui)
     .clicked()
     {
-        *obj_path = Some(path_string);
+        *selected_obj = Some(ObjectConfig {
+            name: object_name.to_string(),
+            target_path: object.target_path.clone().unwrap_or_default(),
+            base_path: object.base_path.clone().unwrap_or_default(),
+            reverse_fn_order: object.reverse_fn_order,
+        });
     }
 }
 
@@ -339,17 +355,17 @@ enum NodeOpen {
 
 fn display_node(
     ui: &mut egui::Ui,
-    obj_path: &mut Option<String>,
+    selected_obj: &mut Option<ObjectConfig>,
     node: &ProjectObjectNode,
     appearance: &Appearance,
     node_open: NodeOpen,
 ) {
     match node {
         ProjectObjectNode::File(name, object) => {
-            display_object(ui, obj_path, name, object, appearance);
+            display_object(ui, selected_obj, name, object, appearance);
         }
         ProjectObjectNode::Dir(name, children) => {
-            let contains_obj = obj_path.as_ref().map(|path| contains_node(node, path));
+            let contains_obj = selected_obj.as_ref().map(|path| contains_node(node, path));
             let open = match node_open {
                 NodeOpen::Default => None,
                 NodeOpen::Open => Some(true),
@@ -372,21 +388,18 @@ fn display_node(
             .open(open)
             .show(ui, |ui| {
                 for node in children {
-                    display_node(ui, obj_path, node, appearance, node_open);
+                    display_node(ui, selected_obj, node, appearance, node_open);
                 }
             });
         }
     }
 }
 
-fn contains_node(node: &ProjectObjectNode, path: &str) -> bool {
+fn contains_node(node: &ProjectObjectNode, selected_obj: &ObjectConfig) -> bool {
     match node {
-        ProjectObjectNode::File(_, object) => {
-            let path_string = object.path.to_string_lossy().to_string();
-            path == path_string
-        }
+        ProjectObjectNode::File(_, object) => object.name() == selected_obj.name,
         ProjectObjectNode::Dir(_, children) => {
-            children.iter().any(|node| contains_node(node, path))
+            children.iter().any(|node| contains_node(node, selected_obj))
         }
     }
 }
@@ -444,11 +457,12 @@ fn pick_folder_ui(
     label: &str,
     tooltip: impl FnOnce(&mut egui::Ui),
     appearance: &Appearance,
+    enabled: bool,
 ) -> egui::Response {
     let response = ui.horizontal(|ui| {
         subheading(ui, label, appearance);
         ui.link(HELP_ICON).on_hover_ui(tooltip);
-        ui.button("Select")
+        ui.add_enabled(enabled, egui::Button::new("Select"))
     });
     ui.label(format_path(dir, appearance));
     response.inner
@@ -506,6 +520,7 @@ fn split_obj_config_ui(
             ui.label(job);
         },
         appearance,
+        true,
     );
     if response.clicked() {
         if let Some(path) = rfd::FileDialog::new().pick_folder() {
@@ -566,6 +581,7 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
+            !config.project_config_loaded,
         );
         if response.clicked() {
             if let Some(path) = rfd::FileDialog::new().set_directory(&project_dir).pick_folder() {
@@ -615,6 +631,7 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
+            !config.project_config_loaded,
         );
         if response.clicked() {
             if let Some(path) = rfd::FileDialog::new().set_directory(&project_dir).pick_folder() {
@@ -626,7 +643,7 @@ fn split_obj_config_ui(
 
     subheading(ui, "Watch settings", appearance);
     let response =
-        ui.checkbox(&mut config.watcher_enabled, "Rebuild on changes").on_hover_ui(|ui| {
+        ui.checkbox(&mut config.rebuild_on_changes, "Rebuild on changes").on_hover_ui(|ui| {
             let mut job = LayoutJob::default();
             job.append(
                 "Automatically re-run the build & diff when files change.",

src/views/jobs.rs

@@ -1,4 +1,4 @@
-use egui::{ProgressBar, Widget};
+use egui::{ProgressBar, RichText, Widget};
 
 use crate::{jobs::JobQueue, views::appearance::Appearance};
 
@@ -31,7 +31,7 @@ pub fn jobs_ui(ui: &mut egui::Ui, jobs: &mut JobQueue, appearance: &Appearance)
             bar.ui(ui);
             const STATUS_LENGTH: usize = 80;
             if let Some(err) = &status.error {
-                let err_string = err.to_string();
+                let err_string = format!("{:#}", err);
                 ui.colored_label(
                     appearance.delete_color,
                     if err_string.len() > STATUS_LENGTH - 10 {
@@ -39,13 +39,15 @@ pub fn jobs_ui(ui: &mut egui::Ui, jobs: &mut JobQueue, appearance: &Appearance)
                     } else {
                         format!("Error: {:width$}", err_string, width = STATUS_LENGTH - 7)
                     },
-                );
+                )
+                .on_hover_text_at_pointer(RichText::new(err_string).color(appearance.delete_color));
             } else {
                 ui.label(if status.status.len() > STATUS_LENGTH - 3 {
                     format!("{}…", &status.status[0..STATUS_LENGTH - 3])
                 } else {
                     format!("{:width$}", &status.status, width = STATUS_LENGTH)
-                });
+                })
+                .on_hover_text_at_pointer(&status.status);
             }
         });
     }

src/views/symbol_diff.rs

@@ -62,15 +62,10 @@ impl DiffViewState {
 
         self.symbol_state.disable_reverse_fn_order = false;
         if let Ok(config) = config.read() {
-            if let Some(obj_path) = &config.obj_path {
-                if let Some(object) = config.objects.iter().find(|object| {
-                    let path_string = object.path.to_string_lossy().to_string();
-                    &path_string == obj_path
-                }) {
-                    if let Some(value) = object.reverse_fn_order {
-                        self.symbol_state.reverse_fn_order = value;
-                        self.symbol_state.disable_reverse_fn_order = true;
-                    }
+            if let Some(obj_config) = &config.selected_obj {
+                if let Some(value) = obj_config.reverse_fn_order {
+                    self.symbol_state.reverse_fn_order = value;
+                    self.symbol_state.disable_reverse_fn_order = true;
                 }
             }
         }