cli: idempotent `rad id update`

Instead of producing an error when there is no update during `rad id
update`, a message that the document is up to date is printed. The
command is considered is considered successful.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

radicle-cli/examples/rad-id-private.md

@@ -62,17 +62,16 @@ $ rad id update --title "Remove allow list" --allow did:key:z6Mkt67GdsW7715MEfRu
 ✗ Error: `--allow` and `--disallow` must not overlap: ["did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk"]
 ```
 
-Allowing or disallowing the same peer twice will result in an error the second
-call, since there is no update specified:
+Allowing or disallowing the same peer twice will result in a message saying that
+the document is already up to date:
 
 ```
 $ rad id update --title "Allow Bob" --allow did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk -q
 ...
 ```
-``` (fails)
-$ rad id update --title "Allow Bob" --allow did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk -q
-✗ Error: no update specified
-✗ Hint: an update to the identity must be specified, run `rad id update -h` to see the available options
+```
+$ rad id update --title "Allow Bob" --allow did:key:z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk
+Nothing to do. The document is up to date. See `rad inspect --identity`.
 ```
 
 If we attempt to change the list while also changing the repository to `public`,

radicle-cli/examples/rad-id-update-delete-field.md

@@ -74,5 +74,5 @@ Note that we cannot delete mandatory fields:
 
 ``` (fails)
 $ rad id update --title "Delete default branch" --payload xyz.radicle.project defaultBranch null
-✗ Error: failed to verify `xyz.radicle.project`, failed with json: missing field `defaultBranch`
+✗ Error: failed to verify `xyz.radicle.project`, json: missing field `defaultBranch`
 ```

radicle-cli/examples/rad-id.md

@@ -174,10 +174,9 @@ $ rad id accept 0ca42d376bd566631083c8913cf86bec722da392
 ✗ Error: [..]
 ```
 
-If no updates are specified then the update will fail:
+If no updates are specified then we are told that our command had no effect:
 
-``` (fail)
-$ rad id update --title "Update canonical branch" --description "Update the canonical branch to `main`"
-✗ Error: no update specified
-✗ Hint: an update to the identity must be specified, run `rad id update -h` to see the available options
+```
+$ rad id update --title "Update canonical branch" --description "Update the canonical branch to `main`"
+Nothing to do. The document is up to date. See `rad inspect --identity`.
 ```

radicle-cli/src/commands/id.rs

@@ -465,15 +465,15 @@ pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
                 // Verify that the project payload can still be parsed into the
                 // `Project` type.
                 if let Err(e) = proposal.project() {
-                    anyhow::bail!("failed to verify `xyz.radicle.project`, failed with {e}",);
+                    anyhow::bail!("failed to verify `xyz.radicle.project`, {e}");
                 }
                 proposal
             };
             if proposal == current.doc {
-                return Err(Error::WithHint {
-                    err: anyhow!("no update specified"),
-                    hint: "an update to the identity must be specified, run `rad id update -h` to see the available options"
-                }.into());
+                term::print(term::format::italic(
+                    "Nothing to do. The document is up to date. See `rad inspect --identity`.",
+                ));
+                return Ok(());
             }
             let revision = update(title, description, proposal, &mut identity, &signer)?;