Auto merge of #1119 - matthewjasper:removing-message, r=Diggsey

Add a message when removing a component

Fixes #306.
The message is (for example)
```
info: removing component 'rust-std' for 'x86_64-unknown-linux-musl'
```

Author: bors

src/rustup-dist/src/manifestation.rs

@@ -157,6 +157,11 @@ impl Manifestation {
 
         // Uninstall components
         for component in components_to_uninstall {
+
+            notify_handler(Notification::RemovingComponent(&component.pkg,
+                                                           &self.target_triple,
+                                                           component.target.as_ref()));
+
             tx = try!(self.uninstall_component(&component, tx, notify_handler.clone()));
         }
 

src/rustup-dist/src/notifications.rs

@@ -26,6 +26,7 @@ pub enum Notification<'a> {
     MissingInstalledComponent(&'a str),
     DownloadingComponent(&'a str, &'a TargetTriple, Option<&'a TargetTriple>),
     InstallingComponent(&'a str, &'a TargetTriple, Option<&'a TargetTriple>),
+    RemovingComponent(&'a str, &'a TargetTriple, Option<&'a TargetTriple>),
     DownloadingManifest(&'a str),
     DownloadingLegacyManifest,
     ManifestChecksumFailedHack,
@@ -55,6 +56,7 @@ impl<'a> Notification<'a> {
             Extracting(_, _) | SignatureValid(_)  |
             DownloadingComponent(_, _, _) |
             InstallingComponent(_, _, _) |
+            RemovingComponent(_, _, _) |
             ComponentAlreadyInstalled(_)  |
             ManifestChecksumFailedHack |
             RollingBack | DownloadingManifest(_) => NotificationLevel::Info,
@@ -105,6 +107,13 @@ impl<'a> Display for Notification<'a> {
                     write!(f, "installing component '{}' for '{}'", c, t.unwrap())
                 }
             }
+            RemovingComponent(c, h, t) => {
+                if Some(h) == t || t.is_none() {
+                    write!(f, "removing component '{}'", c)
+                } else {
+                    write!(f, "removing component '{}' for '{}'", c, t.unwrap())
+                }
+            }
             DownloadingManifest(t) => write!(f, "syncing channel updates for '{}'", t),
             DownloadingLegacyManifest => write!(f, "manifest not found. trying legacy manifest"),
             ManifestChecksumFailedHack => write!(f, "update not yet available, sorry! try again later"),

tests/cli-rustup.rs

@@ -40,6 +40,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'
@@ -83,6 +87,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'
@@ -92,6 +100,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'
@@ -101,6 +113,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'
@@ -130,6 +146,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'
@@ -140,6 +160,10 @@ info: downloading component 'rust-std'
 info: downloading component 'rustc'
 info: downloading component 'cargo'
 info: downloading component 'rust-docs'
+info: removing component 'rust-std'
+info: removing component 'rustc'
+info: removing component 'cargo'
+info: removing component 'rust-docs'
 info: installing component 'rust-std'
 info: installing component 'rustc'
 info: installing component 'cargo'