1 files changed, 46 insertions, 0 deletions
diff --git a/ds100-macro/src/lib.rs b/ds100-macro/src/lib.rs
new file mode 100644
index 0000000..d99c504
--- /dev/null
+++ b/ds100-macro/src/lib.rs
@@ -0,0 +1,46 @@
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use std::{collections::HashMap, fs::File, io::BufReader};
+use std::io::prelude::*;
+
+
+
+fn readds100() -> HashMap<String, String> {
+    // who needs obvious filepaths, anyways?
+    let filename = "./DBNetz-Betriebsstellenverzeichnis-Stand2021-10.csv";
+    let file = File::open(filename).unwrap();
+    let reader = BufReader::new(file);
+
+    reader.lines()
+          .filter_map(|l| l.ok())
+        .skip(1)
+          .map(|l| {
+              let segments: Vec<&str> = l
+                  .split(";")
+                  .collect();
+              (segments[1].to_owned(),segments[2].to_owned())
+          })
+          .collect::<HashMap<String,String>>()
+}
+
+
+// rust macros are a strange kind of horrible, tbh
+#[proc_macro]
+pub fn make_ds100(_item: TokenStream) -> TokenStream {
+    let symbols = readds100();
+
+    format!(
+        "pub fn ds100(key: &str) -> Option<&str> {{
+          match key {{
+             {}
+             _ => None
+          }}
+        }}",
+        symbols.iter()
+               .map(|(k,v)| format!("\"{}\" => Some(\"{}\"),",k,v))
+               .collect::<Vec<_>>()
+               .join("\n")
+    ).parse().unwrap()
+}