D11762: rhg: Colored output is not supported

[SimonSapin]

SimonSapin created this revision.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  Fallback if it is requested explicitly.
  
  The default is documented as use color "whenever it seems possible".
  rhg proceeds without color in that case.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D11762

AFFECTED FILES
  rust/rhg/src/main.rs

CHANGE DETAILS

diff --git a/rust/rhg/src/main.rs b/rust/rhg/src/main.rs
--- a/rust/rhg/src/main.rs
+++ b/rust/rhg/src/main.rs
@@ -28,7 +28,7 @@
     repo: Result<&Repo, &NoRepoInCwdError>,
     config: &Config,
 ) -> Result<(), CommandError> {
-    check_unsupported(config)?;
+    check_unsupported(config, ui)?;
 
     let app = App::new("rhg")
         .global_setting(AppSettings::AllowInvalidUtf8)
@@ -615,7 +615,10 @@
     }
 }
 
-fn check_unsupported(config: &Config) -> Result<(), CommandError> {
+fn check_unsupported(
+    config: &Config,
+    ui: &ui::Ui,
+) -> Result<(), CommandError> {
     check_extensions(config)?;
 
     if std::env::var_os("HG_PENDING").is_some() {
@@ -632,5 +635,11 @@
         Err(CommandError::unsupported("[decode] config"))?
     }
 
+    if let Some(color) = config.get(b"ui", b"color") {
+        if (color == b"always" || color == b"debug") && !ui.plain() {
+            Err(CommandError::unsupported("colored output"))?
+        }
+    }
+
     Ok(())
 }



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