1 files changed, 91 insertions, 0 deletions
diff --git a/apps/koffice/libko/src/cass/error.rs b/apps/koffice/libko/src/cass/error.rs
new file mode 100644
index 000000000000..24bbb4965494
--- /dev/null
+++ b/apps/koffice/libko/src/cass/error.rs
@@ -0,0 +1,91 @@
+//! A set of error types for cassiopeia
+
+use std::fmt::{self, Display, Formatter};
+use std::{error::Error, io};
+
+/// User errors that can occur when using cassiopeia
+///
+/// None of these errors are the fault of the program, but rather
+/// fault of the user for giving invalid commands.  They must never
+/// make the program crash, but instead need to print human friendly
+/// error messages.
+#[derive(Debug)]
+pub enum UserError {
+    /// Trying to start a session when one exists
+    ActiveSessionExists,
+    /// Trying to stop a session when none exists
+    NoActiveSession,
+    /// Trying to create a second invoice on the same day
+    SameDayInvoice,
+    /// No work was done since the last invoice
+    NoWorkInvoice,
+}
+
+impl Display for UserError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "You're doing it wrong!")
+    }
+}
+
+impl Error for UserError {}
+
+pub type UserResult<T> = Result<T, UserError>;
+
+/// Errors that occur when parsing a file
+///
+/// These errors can pre-maturely terminate the run of the program,
+/// but must print a detailed error about what is wrong.  Also,
+/// because they are technically a superset of
+/// [`UserError`](self::UserError), one of the variants is an embedded
+/// user error.
+#[derive(Debug)]
+pub enum ParseError {
+    /// An embedded user error
+    ///
+    /// This error means that the structure of the parsed file is
+    /// wrong, with an invalid sequence of events expressed
+    User(UserError),
+    /// The requested file did not exist
+    NoSuchFile,
+    /// The file could not be read
+    BadPermissions,
+    /// The file could not be written to
+    FileNotWritable,
+    /// Other file related errors
+    FileUnknown(String),
+    /// An invalid keyword was found
+    BadKeyword { line: usize, tokn: String },
+    /// A bad timestamp was found
+    BadTimestamp { line: usize, tokn: String },
+    /// A bad date was found
+    BadDate { line: usize, tokn: String },
+    /// An unknown parse error occured
+    Unknown,
+}
+
+impl Display for ParseError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "The parsed file was bad :(")
+    }
+}
+
+impl Error for ParseError {}
+
+pub type ParseResult<T> = Result<T, ParseError>;
+
+impl From<UserError> for ParseError {
+    fn from(user: UserError) -> Self {
+        ParseError::User(user)
+    }
+}
+
+impl From<io::Error> for ParseError {
+    fn from(e: io::Error) -> Self {
+        use io::ErrorKind::*;
+        match e.kind() {
+            NotFound => Self::NoSuchFile,
+            PermissionDenied => Self::BadPermissions,
+            _ => Self::FileUnknown(format!("{}", e)),
+        }
+    }
+}