Remove dependency on files for running compare.

The tests still use files since they get the test name from a file but compare does the same action via stdin so it can operator on any org source.

src/main.rs

@@ -1,5 +1,6 @@
 #![feature(round_char_boundary)]
-use std::path::Path;
+#[cfg(feature = "compare")]
+use std::io::Read;
 
 #[cfg(feature = "compare")]
 use ::organic::parser::document;
@@ -36,22 +37,26 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 fn main_body() -> Result<(), Box<dyn std::error::Error>> {
-    run_compare(
-        std::env::args()
-            .nth(1)
-            .ok_or("Pass a single file into this script.")?,
-    )
+    let org_contents = read_stdin_to_string()?;
+    run_compare(org_contents)
+}
+
+fn read_stdin_to_string() -> Result<String, Box<dyn std::error::Error>> {
+    let mut stdin_contents = String::new();
+    std::io::stdin()
+        .lock()
+        .read_to_string(&mut stdin_contents)?;
+    Ok(stdin_contents)
 }
 
 #[cfg(feature = "compare")]
-fn run_compare<P: AsRef<Path>>(todo_org_path: P) -> Result<(), Box<dyn std::error::Error>> {
-    let org_contents = std::fs::read_to_string(todo_org_path.as_ref())?;
-    let (remaining, rust_parsed) = document(org_contents.as_str()).expect("Org Parse failure");
-    let org_sexp = emacs_parse_org_document(todo_org_path.as_ref())?;
+fn run_compare<P: AsRef<str>>(org_contents: P) -> Result<(), Box<dyn std::error::Error>> {
+    let (remaining, rust_parsed) = document(org_contents.as_ref()).expect("Org Parse failure");
+    let org_sexp = emacs_parse_org_document(org_contents.as_ref())?;
     let (_remaining, parsed_sexp) =
         sexp_with_padding(org_sexp.as_str()).expect("Sexp Parse failure");
 
-    println!("{}\n\n\n", org_contents.as_str());
+    println!("{}\n\n\n", org_contents.as_ref());
     println!("{}", org_sexp);
     println!("{:#?}", rust_parsed);