feat: set message for multiple revsets

Allows to set the revision message of multiple revisions by passing
them as arguments. This only supports simple revisions, such as `@`,
`@-`, `xs`, and so on. Comple revisions such as `@..@-` are not
supported.

Fixes: #5

src/error.rs

@@ -1,3 +1,5 @@
+use jj_lib::revset::{RevsetEvaluationError, RevsetParseError, RevsetResolutionError};
+
 use crate::commit::types::{CommitMessageError, DescriptionError, ScopeError};
 
 #[derive(Debug, Clone, PartialEq, Eq, thiserror::Error)]
@@ -25,6 +27,10 @@ pub enum Error {
     Cancelled,
     #[error("Non-interactive terminal detected")]
     NonInteractive,
+    #[error("Failed to resolve revision '{revset}': {context}")]
+    RevsetResolutionError { revset: String, context: String },
+    #[error("Revision set '{revset}' resolves to multiple commits; specify a single revision")]
+    MultipleRevisions { revset: String },
 }
 
 impl From<ScopeError> for Error {
@@ -46,7 +52,38 @@ impl From<CommitMessageError> for Error {
 }
 
 impl From<std::io::Error> for Error {
-    fn from(_value: std::io::Error) -> Self {
+    fn from(_: std::io::Error) -> Self {
         Self::FailedGettingCurrentDir
     }
 }
+
+impl<T> From<std::sync::PoisonError<T>> for Error {
+    fn from(_: std::sync::PoisonError<T>) -> Self {
+        Self::JjOperation {
+            context: "internal lock poisoned".to_string(),
+        }
+    }
+}
+
+impl Error {
+    pub fn from_revset_parse_error(revset: &str, error: RevsetParseError) -> Self {
+        Self::RevsetResolutionError {
+            revset: revset.to_string(),
+            context: error.to_string(),
+        }
+    }
+
+    pub fn from_revset_resolution_error(revset: &str, error: RevsetResolutionError) -> Self {
+        Self::RevsetResolutionError {
+            revset: revset.to_string(),
+            context: error.to_string(),
+        }
+    }
+
+    pub fn from_revset_evaluation_error(revset: &str, error: RevsetEvaluationError) -> Self {
+        Self::RevsetResolutionError {
+            revset: revset.to_string(),
+            context: error.to_string(),
+        }
+    }
+}