cli: indicate each workspace's checkout in log (#13)

It seems helpful to show in the log output which commit is checked out
in which workspace, so let's try that. I made it only show the
information if there are multiple checkouts for now.

src/commands.rs

@@ -2549,6 +2549,7 @@ fn log_template(settings: &UserSettings) -> String {
             " " label("timestamp", author.timestamp())
             " " branches
             " " tags
+            " " checkouts
             if(is_git_head, label("git_head", " HEAD@git"))
             if(divergent, label("divergent", " divergent"))
             if(conflict, label("conflict", " conflict"))

src/formatter.rs

@@ -88,6 +88,7 @@ fn config_colors(user_settings: &UserSettings) -> HashMap<String, String> {
     result.insert(String::from("author timestamp"), String::from("cyan"));
     result.insert(String::from("committer"), String::from("yellow"));
     result.insert(String::from("committer timestamp"), String::from("cyan"));
+    result.insert(String::from("checkouts"), String::from("magenta"));
     result.insert(String::from("branch"), String::from("magenta"));
     result.insert(String::from("branches"), String::from("magenta"));
     result.insert(String::from("tags"), String::from("magenta"));
@@ -128,6 +129,10 @@ fn config_colors(user_settings: &UserSettings) -> HashMap<String, String> {
         String::from("checkout committer timestamp"),
         String::from("bright cyan"),
     );
+    result.insert(
+        String::from("checkout checkouts"),
+        String::from("bright magenta"),
+    );
     result.insert(
         String::from("checkout branch"),
         String::from("bright magenta"),

src/template_parser.rs

@@ -24,10 +24,10 @@ use pest::Parser;
 
 use crate::formatter::PlainTextFormatter;
 use crate::templater::{
-    AuthorProperty, BranchProperty, ChangeIdProperty, CommitIdKeyword, CommitterProperty,
-    ConditionalTemplate, ConflictProperty, ConstantTemplateProperty, CurrentCheckoutProperty,
-    DescriptionProperty, DivergentProperty, DynamicLabelTemplate, GitRefsProperty,
-    IsGitHeadProperty, LabelTemplate, ListTemplate, LiteralTemplate, OpenProperty,
+    AuthorProperty, BranchProperty, ChangeIdProperty, CheckoutsProperty, CommitIdKeyword,
+    CommitterProperty, ConditionalTemplate, ConflictProperty, ConstantTemplateProperty,
+    CurrentCheckoutProperty, DescriptionProperty, DivergentProperty, DynamicLabelTemplate,
+    GitRefsProperty, IsGitHeadProperty, LabelTemplate, ListTemplate, LiteralTemplate, OpenProperty,
     StringPropertyTemplate, TagProperty, Template, TemplateFunction, TemplateProperty,
 };
 
@@ -243,6 +243,7 @@ fn parse_commit_keyword<'a>(
         "author" => Property::Signature(Box::new(AuthorProperty)),
         "committer" => Property::Signature(Box::new(CommitterProperty)),
         "open" => Property::Boolean(Box::new(OpenProperty)),
+        "checkouts" => Property::String(Box::new(CheckoutsProperty { repo })),
         "current_checkout" => Property::Boolean(Box::new(CurrentCheckoutProperty {
             repo,
             workspace_id: workspace_id.clone(),

src/templater.rs

@@ -205,6 +205,26 @@ impl<'r> TemplateProperty<Commit, bool> for OpenProperty {
     }
 }
 
+pub struct CheckoutsProperty<'a> {
+    pub repo: RepoRef<'a>,
+}
+
+impl TemplateProperty<Commit, String> for CheckoutsProperty<'_> {
+    fn extract(&self, context: &Commit) -> String {
+        let checkouts = self.repo.view().checkouts();
+        if checkouts.len() <= 1 {
+            return "".to_string();
+        }
+        let mut names = vec![];
+        for (workspace_id, checkout_id) in checkouts.iter().sorted() {
+            if checkout_id == context.id() {
+                names.push(format!("{}@", workspace_id.as_str()));
+            }
+        }
+        names.join(" ")
+    }
+}
+
 pub struct CurrentCheckoutProperty<'a> {
     pub repo: RepoRef<'a>,
     pub workspace_id: WorkspaceId,