feat: remove non first parent on revwalk based on settings

src/git/revspec.rs

@@ -70,6 +70,9 @@ impl Repository {
     pub fn all_commits(&self) -> Result<CommitRange, Git2Error> {
         let mut revwalk = self.0.revwalk()?;
         revwalk.push_head()?;
+        if SETTINGS.only_first_parent {
+            revwalk.simplify_first_parent()?;
+        }
         let mut commits = vec![];
 
         for oid in revwalk {
@@ -331,6 +334,9 @@ impl Repository {
         let mut revwalk = self.0.revwalk()?;
 
         revwalk.push_range(spec)?;
+        if SETTINGS.only_first_parent {
+            revwalk.simplify_first_parent()?;
+        }
 
         let mut commits: Vec<Commit> = vec![];
 

src/settings/mod.rs

@@ -33,6 +33,7 @@ pub struct Settings {
     pub from_latest_tag: bool,
     pub ignore_merge_commits: bool,
     pub generate_mono_repository_global_tag: bool,
+    pub only_first_parent: bool,
     pub monorepo_version_separator: Option<String>,
     pub branch_whitelist: Vec<String>,
     pub tag_prefix: Option<String>,
@@ -55,6 +56,7 @@ impl Default for Settings {
             from_latest_tag: false,
             ignore_merge_commits: false,
             generate_mono_repository_global_tag: true,
+            only_first_parent: false,
             monorepo_version_separator: None,
             branch_whitelist: vec![],
             tag_prefix: None,