cassiopeia: finishing up version 0.3.0

This commit does kind of a lot to get cass(1) over the finish line.
For one it implements all the CLI functions (well, almost all) with
their respective parameters, and also creates a new `gen` module which
uses the IR stream to generate a new file based on the old one, while
updating header fields that need to be updated (currently only
`version`).

This version does nothing with the actual header values, and probably
has a lot of bugs.  More documentation will follow in future
cassiopeia commits.

1 files changed, 33 insertions, 0 deletions

diff --git a/apps/cassiopeia/src/format/gen.rs b/apps/cassiopeia/src/format/gen.rs
new file mode 100644
index 000000000000..2bcd6cc724fd
--- /dev/null
+++ b/apps/cassiopeia/src/format/gen.rs
@@ -0,0 +1,33 @@
+//! Cassiopeia line generator
+//!
+//! This module takes a set of IR lines, and generates strings from
+//! them that are in accordance with the way that the parser of the
+//! same version expects them.
+
+use crate::format::ir::{IrItem, IrType};
+
+/// Take a line of IR and generate a string to print into a file
+pub(crate) fn line(ir: &IrItem) -> String {
+    let IrItem { tt, lo } = ir;
+    match tt {
+        IrType::Ignore => "".into(),
+        IrType::Header(map) => format!(
+            "HEADER {}",
+            map.iter()
+                .map(|(k, v)| format!("{}={},", k, v))
+                .collect::<Vec<_>>()
+                .join("")
+        ),
+        IrType::Start(time) => format!("START {}", time.to_string()),
+        
+        // FIXME: find a better way to align the lines here rather
+        // than having to manually having to pad the 'STOP' commands
+        IrType::Stop(time) => format!("STOP  {}", time.to_string()),
+        IrType::Invoice(date) => format!("INVOICE {}", date.to_string()),
+    }
+}
+
+pub(crate) fn head_comment() -> String {
+    ";; generated by cassiopeia, be careful about editing by hand!".into()
+}
+