wip: rely on git version of prettyplease, refactor autofmt

packages/autofmt/src/expr.rs

@@ -0,0 +1,39 @@
+//! pretty printer for rsx!
+use std::fmt::{self, Write};
+
+pub fn write_raw_expr(
+    exp: &syn::Expr,
+    indent: usize,
+    lines: &[&str],
+    buf: &mut String,
+) -> Result<(), fmt::Error> {
+    use syn::spanned::Spanned;
+    let placement = exp.span();
+    let start = placement.start();
+    let end = placement.end();
+    let num_spaces_desired = (indent * 4) as isize;
+    let first = lines[start.line - 1];
+    let num_spaces_real = first.chars().take_while(|c| c.is_whitespace()).count() as isize;
+    let offset = num_spaces_real - num_spaces_desired;
+
+    for line_id in start.line - 1..end.line {
+        let line = lines[line_id];
+
+        // trim the leading whitespace
+
+        if offset < 0 {
+            for _ in 0..-offset {
+                write!(buf, " ")?;
+            }
+
+            writeln!(buf, "{}", line)?;
+        } else {
+            let offset = offset as usize;
+
+            let right = &line[offset..];
+            writeln!(buf, "{}", right)?;
+        }
+    }
+
+    Ok(())
+}