refactor: move policy on whether to back up a file into a module

This commit also splits up the src/cmd/backup.rs module into other,
smaller, more cohesive modules that are easier to understand and use.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/backup_reason.rs b/src/backup_reason.rs
new file mode 100644
index 0000000..cc0d49a
--- /dev/null
+++ b/src/backup_reason.rs
@@ -0,0 +1,34 @@
+use rusqlite::types::ToSqlOutput;
+use rusqlite::ToSql;
+use std::fmt;
+
+#[derive(Debug)]
+pub enum Reason {
+    Skipped,
+    IsNew,
+    Changed,
+    Unchanged,
+    Error,
+}
+
+impl ToSql for Reason {
+    fn to_sql(&self) -> rusqlite::Result<ToSqlOutput> {
+        Ok(ToSqlOutput::Owned(rusqlite::types::Value::Text(format!(
+            "{}",
+            self
+        ))))
+    }
+}
+
+impl fmt::Display for Reason {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let reason = match self {
+            Reason::Skipped => "skipped",
+            Reason::IsNew => "new",
+            Reason::Changed => "changed",
+            Reason::Unchanged => "unchanged",
+            Reason::Error => "error",
+        };
+        write!(f, "{}", reason)
+    }
+}