[Request] [+++ ] D8960: rhg: add a `DebugData` `Command` to prepare the `rhg debugdata` subcommand

[acezar (Antoine Cezar)]

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

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D8960

AFFECTED FILES
  rust/hg-core/src/operations/mod.rs
  rust/rhg/src/commands.rs
  rust/rhg/src/commands/debugdata.rs

CHANGE DETAILS

diff --git a/rust/rhg/src/commands/debugdata.rs b/rust/rhg/src/commands/debugdata.rs
new file mode 100644
--- /dev/null
+++ b/rust/rhg/src/commands/debugdata.rs
@@ -0,0 +1,57 @@
+use crate::commands::Command;
+use crate::error::{CommandError, CommandErrorKind};
+use crate::ui::Ui;
+use hg::operations::{
+    DebugData, DebugDataError, DebugDataErrorKind, DebugDataKind,
+};
+
+pub const HELP_TEXT: &str = "
+Dump the contents of a data file revision
+";
+
+pub struct DebugDataCommand<'a> {
+    rev: &'a str,
+    kind: DebugDataKind,
+}
+
+impl<'a> DebugDataCommand<'a> {
+    pub fn new(rev: &'a str, kind: DebugDataKind) -> Self {
+        DebugDataCommand { rev, kind }
+    }
+}
+
+impl<'a> Command for DebugDataCommand<'a> {
+    fn run(&self, ui: &Ui) -> Result<(), CommandError> {
+        let mut operation = DebugData::new(self.rev, self.kind);
+        let data =
+            operation.run().map_err(|e| to_command_error(self.rev, e))?;
+
+        let mut stdout = ui.stdout_buffer();
+        stdout.write_all(&data)?;
+        stdout.flush()?;
+
+        Ok(())
+    }
+}
+
+/// Convert operation errors to command errors
+fn to_command_error(rev: &str, err: DebugDataError) -> CommandError {
+    match err.kind {
+        DebugDataErrorKind::FindRootError(err) => CommandError::from(err),
+        DebugDataErrorKind::IoError(err) => CommandError {
+            kind: CommandErrorKind::Abort(Some(
+                [b"abort: ", err.to_string().as_bytes(), b"\n"].concat(),
+            )),
+        },
+        DebugDataErrorKind::InvalidRevision => CommandError {
+            kind: CommandErrorKind::Abort(Some(
+                [
+                    b"abort: invalid revision identifier ",
+                    rev.to_string().as_bytes(),
+                    b"\n",
+                ]
+                .concat(),
+            )),
+        },
+    }
+}
diff --git a/rust/rhg/src/commands.rs b/rust/rhg/src/commands.rs
--- a/rust/rhg/src/commands.rs
+++ b/rust/rhg/src/commands.rs
@@ -1,3 +1,4 @@
+pub mod debugdata;
 pub mod files;
 pub mod root;
 use crate::error::CommandError;
diff --git a/rust/hg-core/src/operations/mod.rs b/rust/hg-core/src/operations/mod.rs
--- a/rust/hg-core/src/operations/mod.rs
+++ b/rust/hg-core/src/operations/mod.rs
@@ -6,6 +6,9 @@
 mod dirstate_status;
 mod find_root;
 mod list_tracked_files;
+pub use debugdata::{
+    DebugData, DebugDataError, DebugDataErrorKind, DebugDataKind,
+};
 pub use find_root::{FindRoot, FindRootError, FindRootErrorKind};
 pub use list_tracked_files::{
     ListTrackedFiles, ListTrackedFilesError, ListTrackedFilesErrorKind,



To: acezar, #hg-reviewers
Cc: mercurial-patches, mercurial-devel
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