Allow copying comparisons (LiveSplit#812)

This adds functionality to the run editor to allow copying comparisons.
This is not only useful for copying custom comparisons, but also for
"baking" the times of a generated comparison, such as the `Latest Run` or
the `Average Segments` to a custom comparison that you can keep around
as long as you want. This is somewhat also meant to replace the
functionality of storing the current run as a Personal Best. Instead you
can just store the `Latest Run` as a custom comparison after you are
done with it.

Cargo.toml

@@ -123,7 +123,7 @@ libc = { version = "0.2.101", optional = true }
 seahash = "4.1.0"
 
 [target.'cfg(windows)'.dev-dependencies]
-sysinfo = { version = "0.30.0", default-features = false }
+winreg = "0.52.0"
 
 [target.'cfg(not(target_family = "wasm"))'.dev-dependencies]
 criterion = "0.5.0"

capi/src/run_editor.rs

@@ -352,7 +352,7 @@ pub unsafe extern "C" fn RunEditor_active_parse_and_set_comparison_time(
 }
 
 /// Adds a new custom comparison. It can't be added if it starts with
-/// `[Race]` or already exists.
+/// `[Race]` or it already exists.
 #[no_mangle]
 pub unsafe extern "C" fn RunEditor_add_comparison(
     this: &mut RunEditor,
@@ -425,6 +425,18 @@ pub unsafe extern "C" fn RunEditor_parse_and_generate_goal_comparison(
     this.parse_and_generate_goal_comparison(str(time)).is_ok()
 }
 
+/// Copies a comparison with the given name as a new custom comparison with the
+/// new name provided. It can't be added if it starts with `[Race]` or it
+/// already exists. The old comparison needs to exist.
+#[no_mangle]
+pub unsafe extern "C" fn RunEditor_copy_comparison(
+    this: &mut RunEditor,
+    old_name: *const c_char,
+    new_name: *const c_char,
+) -> bool {
+    this.copy_comparison(str(old_name), str(new_name)).is_ok()
+}
+
 /// Clears out the Attempt History and the Segment Histories of all the
 /// segments.
 #[no_mangle]

src/comparison/latest_run.rs

@@ -27,7 +27,7 @@ pub const NAME: &str = "Latest Run";
 
 fn generate(segments: &mut [Segment], method: TimingMethod) {
     let mut attempt_id = None;
-    for segment in segments.iter_mut().rev() {
+    for segment in segments.iter().rev() {
         if let Some(max_index) = segment.segment_history().try_get_max_index() {
             attempt_id = Some(max_index);
             break;

src/run/editor/mod.rs

@@ -4,7 +4,7 @@
 //! current state of the editor as state objects that can be visualized by any
 //! kind of User Interface.
 
-use super::{ComparisonError, ComparisonResult, LinkedLayout};
+use super::{AddComparisonError, CopyComparisonError, LinkedLayout};
 use crate::{
     comparison,
     platform::prelude::*,
@@ -63,7 +63,7 @@ pub enum RenameError {
     /// Name was invalid.
     InvalidName {
         /// The underlying error.
-        source: ComparisonError,
+        source: AddComparisonError,
     },
 }
 
@@ -743,8 +743,11 @@ impl Editor {
     }
 
     /// Adds a new custom comparison. It can't be added if it starts with
-    /// `[Race]` or already exists.
-    pub fn add_comparison<S: PopulateString>(&mut self, comparison: S) -> ComparisonResult<()> {
+    /// `[Race]` or it already exists.
+    pub fn add_comparison<S: PopulateString>(
+        &mut self,
+        comparison: S,
+    ) -> Result<(), AddComparisonError> {
         self.run.add_custom_comparison(comparison)?;
         self.fix();
         Ok(())
@@ -753,7 +756,11 @@ impl Editor {
     /// Imports the Personal Best from the provided run as a comparison. The
     /// comparison can't be added if its name starts with `[Race]` or it already
     /// exists.
-    pub fn import_comparison(&mut self, run: &Run, comparison: &str) -> ComparisonResult<()> {
+    pub fn import_comparison(
+        &mut self,
+        run: &Run,
+        comparison: &str,
+    ) -> Result<(), AddComparisonError> {
         self.run.add_custom_comparison(comparison)?;
 
         let mut remaining_segments = self.run.segments_mut().as_mut_slice();
@@ -908,6 +915,31 @@ impl Editor {
         Ok(())
     }
 
+    /// Copies a comparison with the given name as a new custom comparison with
+    /// the new name provided. It can't be added if it starts with `[Race]` or
+    /// it already exists. The old comparison needs to exist.
+    pub fn copy_comparison(
+        &mut self,
+        old_name: &str,
+        new_name: &str,
+    ) -> Result<(), CopyComparisonError> {
+        if !self.run.comparisons().any(|c| c == old_name) {
+            return Err(CopyComparisonError::NoSuchComparison);
+        }
+
+        self.run
+            .add_custom_comparison(new_name)
+            .map_err(|source| CopyComparisonError::AddComparison { source })?;
+
+        for segment in self.run.segments_mut() {
+            *segment.comparison_mut(new_name) = segment.comparison(old_name);
+        }
+
+        self.raise_run_edited();
+
+        Ok(())
+    }
+
     /// Clears out the Attempt History and the Segment Histories of all the
     /// segments.
     pub fn clear_history(&mut self) {

src/run/editor/tests/comparison.rs

@@ -1,5 +1,8 @@
-use crate::run::{ComparisonError, Editor, RenameError};
-use crate::{Run, Segment};
+use crate::{
+    comparison::{best_segments, personal_best},
+    run::{AddComparisonError, CopyComparisonError, Editor, RenameError},
+    Run, Segment,
+};
 
 #[test]
 fn adding_a_new_comparison_works() {
@@ -15,8 +18,54 @@ fn adding_a_duplicate_fails() {
     let mut run = Run::new();
     run.push_segment(Segment::new("s"));
     let mut editor = Editor::new(run).unwrap();
-    let c = editor.add_comparison("Best Segments");
-    assert_eq!(c, Err(ComparisonError::DuplicateName));
+    let c = editor.add_comparison(best_segments::NAME);
+    assert_eq!(c, Err(AddComparisonError::DuplicateName));
+}
+
+#[test]
+fn copying_a_comparison_works() {
+    let mut run = Run::new();
+    run.push_segment(Segment::new("s"));
+    let mut editor = Editor::new(run).unwrap();
+    let c = editor.copy_comparison(personal_best::NAME, "My Comparison");
+    assert_eq!(c, Ok(()));
+}
+
+#[test]
+fn copying_a_duplicate_fails() {
+    let mut run = Run::new();
+    run.push_segment(Segment::new("s"));
+    let mut editor = Editor::new(run).unwrap();
+    let c = editor.copy_comparison(personal_best::NAME, best_segments::NAME);
+    assert_eq!(
+        c,
+        Err(CopyComparisonError::AddComparison {
+            source: AddComparisonError::DuplicateName,
+        })
+    );
+}
+
+#[test]
+fn copying_to_a_race_name_fails() {
+    let mut run = Run::new();
+    run.push_segment(Segment::new("s"));
+    let mut editor = Editor::new(run).unwrap();
+    let c = editor.copy_comparison(personal_best::NAME, "[Race]Custom");
+    assert_eq!(
+        c,
+        Err(CopyComparisonError::AddComparison {
+            source: AddComparisonError::NameStartsWithRace,
+        })
+    );
+}
+
+#[test]
+fn copying_an_inexistent_comparison_fails() {
+    let mut run = Run::new();
+    run.push_segment(Segment::new("s"));
+    let mut editor = Editor::new(run).unwrap();
+    let c = editor.copy_comparison("My Comparison", "My Comparison 2");
+    assert_eq!(c, Err(CopyComparisonError::NoSuchComparison));
 }
 
 #[test]
@@ -49,7 +98,7 @@ fn renaming_to_a_race_name_fails() {
     assert_eq!(
         c,
         Err(RenameError::InvalidName {
-            source: ComparisonError::NameStartsWithRace
+            source: AddComparisonError::NameStartsWithRace
         })
     );
 }
@@ -65,7 +114,7 @@ fn renaming_to_an_existing_name_fails() {
     assert_eq!(
         c,
         Err(RenameError::InvalidName {
-            source: ComparisonError::DuplicateName
+            source: AddComparisonError::DuplicateName
         })
     );
 }

src/run/mod.rs

@@ -97,17 +97,26 @@ impl PartialEq for ComparisonGenerators {
     }
 }
 
-/// Error type for an invalid comparison name
+/// Error type for an invalid comparison name to be added.
 #[derive(PartialEq, Eq, Debug, snafu::Snafu)]
-pub enum ComparisonError {
+pub enum AddComparisonError {
     /// Comparison name starts with "\[Race\]".
     NameStartsWithRace,
     /// Comparison name is a duplicate.
     DuplicateName,
 }
 
-/// Result type for an invalid comparison name
-pub type ComparisonResult<T> = Result<T, ComparisonError>;
+/// Error type for copying a comparison.
+#[derive(PartialEq, Eq, Debug, snafu::Snafu)]
+pub enum CopyComparisonError {
+    /// There is no comparison with the provided name to copy.
+    NoSuchComparison,
+    /// The new comparison could not be added.
+    AddComparison {
+        /// The underlying error.
+        source: AddComparisonError,
+    },
+}
 
 impl Run {
     /// Creates a new Run object with no segments.
@@ -485,7 +494,7 @@ impl Run {
     /// Adds a new custom comparison. If a custom comparison with that name
     /// already exists, it is not added.
     #[inline]
-    pub fn add_custom_comparison<S>(&mut self, comparison: S) -> ComparisonResult<()>
+    pub fn add_custom_comparison<S>(&mut self, comparison: S) -> Result<(), AddComparisonError>
     where
         S: PopulateString,
     {
@@ -798,11 +807,11 @@ impl Run {
 
     /// Checks a given name against the current comparisons in the Run to
     /// ensure that it is valid for use.
-    pub fn validate_comparison_name(&self, new: &str) -> ComparisonResult<()> {
+    pub fn validate_comparison_name(&self, new: &str) -> Result<(), AddComparisonError> {
         if new.starts_with(RACE_COMPARISON_PREFIX) {
-            Err(ComparisonError::NameStartsWithRace)
+            Err(AddComparisonError::NameStartsWithRace)
         } else if self.comparisons().any(|c| c == new) {
-            Err(ComparisonError::DuplicateName)
+            Err(AddComparisonError::DuplicateName)
         } else {
             Ok(())
         }

src/run/parser/livesplit.rs

@@ -2,7 +2,7 @@
 
 use crate::{
     platform::prelude::*,
-    run::{ComparisonError, LinkedLayout},
+    run::{AddComparisonError, LinkedLayout},
     settings::Image,
     util::{
         ascii_char::AsciiChar,
@@ -58,7 +58,7 @@ pub enum Error {
     /// Parsed comparison has an invalid name.
     InvalidComparisonName {
         /// The underlying error.
-        source: ComparisonError,
+        source: AddComparisonError,
     },
     /// Failed to parse a boolean.
     ParseBool,
@@ -88,8 +88,8 @@ impl From<crate::timing::ParseError> for Error {
     }
 }
 
-impl From<ComparisonError> for Error {
-    fn from(source: ComparisonError) -> Self {
+impl From<AddComparisonError> for Error {
+    fn from(source: AddComparisonError) -> Self {
         Self::InvalidComparisonName { source }
     }
 }
@@ -314,10 +314,10 @@ fn parse_segment(
                         } else {
                             time_old(reader, |t| *segment.comparison_mut(&comparison) = t)?;
                         }
-                        if let Err(ComparisonError::NameStartsWithRace) =
+                        if let Err(AddComparisonError::NameStartsWithRace) =
                             run.add_custom_comparison(comparison)
                         {
-                            return Err(ComparisonError::NameStartsWithRace.into());
+                            return Err(AddComparisonError::NameStartsWithRace.into());
                         }
                         Ok(())
                     } else {

src/run/parser/time_split_tracker.rs

@@ -1,6 +1,6 @@
 //! Provides the parser for Time Split Tracker splits files.
 
-use super::super::ComparisonError;
+use super::super::AddComparisonError;
 use crate::{
     comparison::RACE_COMPARISON_PREFIX,
     platform::{path::Path, prelude::*},
@@ -124,13 +124,13 @@ pub fn parse(
         loop {
             match run.add_custom_comparison(&**comparison) {
                 Ok(_) => break,
-                Err(ComparisonError::DuplicateName) => {
+                Err(AddComparisonError::DuplicateName) => {
                     let comparison = comparison.to_mut();
                     comparison.drain(orig_len..);
                     let _ = write!(comparison, " {number}");
                     number += 1;
                 }
-                Err(ComparisonError::NameStartsWithRace) => {
+                Err(AddComparisonError::NameStartsWithRace) => {
                     let comparison = comparison.to_mut();
                     // After removing the `[Race]`, there might be some
                     // whitespace we want to trim too.

src/run/tests/comparison.rs

@@ -1,4 +1,4 @@
-use crate::run::{ComparisonError, Run};
+use crate::run::{AddComparisonError, Run};
 
 #[test]
 fn adding_a_new_comparison_works() {
@@ -11,5 +11,5 @@ fn adding_a_new_comparison_works() {
 fn adding_a_duplicate_fails() {
     let mut run = Run::new();
     let c = run.add_custom_comparison("Best Segments");
-    assert_eq!(c, Err(ComparisonError::DuplicateName));
+    assert_eq!(c, Err(AddComparisonError::DuplicateName));
 }

tests/rendering.rs

@@ -60,13 +60,18 @@ fn default() {
 #[cfg(all(feature = "font-loading", windows))]
 #[test]
 fn font_fallback() {
-    let build_number: u64 = sysinfo::System::kernel_version().unwrap().parse().unwrap();
+    let hklm = winreg::RegKey::predef(winreg::enums::HKEY_LOCAL_MACHINE);
+    let cur_ver = hklm
+        .open_subkey(r"SOFTWARE\Microsoft\Windows NT\CurrentVersion")
+        .unwrap();
+    let build_number: String = cur_ver.get_value("CurrentBuildNumber").unwrap();
+    let build_number: u64 = build_number.parse().unwrap();
+    let revision: u32 = cur_ver.get_value("UBR").unwrap();
 
-    if build_number < 22000 {
-        // The hash is different before Windows 11.
+    if (build_number, revision) < (22631, 3672) {
+        // The hash is different before Windows 11 23H2 (end of May 2024 update).
         println!(
-            "Skipping font fallback test on Windows with build number {}.",
-            build_number
+            "Skipping font fallback test on Windows with build number {build_number}.{revision}.",
         );
         return;
     }
@@ -122,8 +127,8 @@ fn font_fallback() {
     check(
         &state,
         &image_cache,
-        "d908fda633352ba5",
-        "299f188d2a8ccf5d",
+        "e3c55d333d082bab",
+        "267615d875c8cf61",
         "font_fallback",
     );
 }