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/compare/parse.rs

@@ -1,22 +1,22 @@
-use std::path::Path;
 use std::process::Command;
 
-pub fn emacs_parse_org_document<'a, C>(file_path: C) -> Result<String, Box<dyn std::error::Error>>
+pub fn emacs_parse_org_document<C>(file_contents: C) -> Result<String, Box<dyn std::error::Error>>
 where
-    C: AsRef<Path>,
+    C: AsRef<str>,
 {
-    let elisp_script = r#"(progn
+    let escaped_file_contents = escape_elisp_string(file_contents);
+    let elisp_script = format!(r#"(progn
+     (erase-buffer)
+     (insert "{escaped_file_contents}")
      (org-mode)
      (message "%s" (pp-to-string (org-element-parse-buffer)))
-)"#;
+)"#, escaped_file_contents=escaped_file_contents);
     let mut cmd = Command::new("emacs");
     let proc = cmd
         .arg("-q")
         .arg("--no-site-file")
         .arg("--no-splash")
         .arg("--batch")
-        .arg("--insert")
-        .arg(file_path.as_ref().as_os_str())
         .arg("--eval")
         .arg(elisp_script);
     let out = proc.output()?;
@@ -24,3 +24,25 @@ where
     let org_sexp = out.stderr;
     Ok(String::from_utf8(org_sexp)?)
 }
+
+fn escape_elisp_string<C>(file_contents: C) -> String
+where
+    C: AsRef<str>,
+{
+    let source = file_contents.as_ref();
+    let source_len = source.len();
+    // We allocate a string 10% larger than the source to account for escape characters. Without this, we would have more allocations during processing.
+    let mut output = String::with_capacity(source_len + (source_len / 10));
+    for c in source.chars() {
+        match c {
+            '"' | '\\' => {
+                output.push('\\');
+                output.push(c);
+            }
+            _ => {
+                output.push(c);
+            }
+        }
+    }
+    output
+}

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);