Generalized the pretty-print entry points to support -o <file>.

src/librustc/driver/driver.rs

@@ -666,7 +666,8 @@ impl pprust::PpAnn for TypedAnnotation {
 pub fn pretty_print_input(sess: Session,
                           cfg: ast::CrateConfig,
                           input: &Input,
-                          ppm: PpMode) {
+                          ppm: PpMode,
+                          ofile: Option<Path>) {
     let krate = phase_1_parse_input(&sess, cfg, input);
     let id = link::find_crate_id(krate.attrs.as_slice(), input.filestem());
 
@@ -684,14 +685,25 @@ pub fn pretty_print_input(sess: Session,
     let src = Vec::from_slice(sess.codemap().get_filemap(src_name).src.as_bytes());
     let mut rdr = MemReader::new(src);
 
+    let out = match ofile {
+        None => ~io::stdout() as ~Writer,
+        Some(p) => {
+            let r = io::File::create(&p);
+            match r {
+                Ok(w) => ~w as ~Writer,
+                Err(e) => fail!("print-print failed to open {} due to {}",
+                                p.display(), e),
+            }
+        }
+    };
     match ppm {
         PpmIdentified | PpmExpandedIdentified => {
             pprust::print_crate(sess.codemap(),
                                 sess.diagnostic(),
                                 &krate,
                                 src_name,
                                 &mut rdr,
-                                ~io::stdout(),
+                                out,
                                 &IdentifiedAnnotation,
                                 is_expanded)
         }
@@ -706,7 +718,7 @@ pub fn pretty_print_input(sess: Session,
                                 &krate,
                                 src_name,
                                 &mut rdr,
-                                ~io::stdout(),
+                                out,
                                 &annotation,
                                 is_expanded)
         }
@@ -716,7 +728,7 @@ pub fn pretty_print_input(sess: Session,
                                 &krate,
                                 src_name,
                                 &mut rdr,
-                                ~io::stdout(),
+                                out,
                                 &pprust::NoAnn,
                                 is_expanded)
         }

src/librustc/lib.rs

@@ -293,7 +293,7 @@ pub fn run_compiler(args: &[~str]) {
     });
     match pretty {
         Some::<d::PpMode>(ppm) => {
-            d::pretty_print_input(sess, cfg, &input, ppm);
+            d::pretty_print_input(sess, cfg, &input, ppm, ofile);
             return;
         }
         None::<d::PpMode> => {/* continue */ }

src/test/run-make/pretty-print-to-file/Makefile

@@ -0,0 +1,5 @@
+-include ../tools.mk
+
+all:
+	$(RUSTC) -o $(TMPDIR)/input.out --pretty=normal input.rs
+	diff -u $(TMPDIR)/input.out input.pp

src/test/run-make/pretty-print-to-file/input.pp

@@ -0,0 +1,13 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+
+#[crate_type = "lib"]
+pub fn foo() -> i32 { 45 }

src/test/run-make/pretty-print-to-file/input.rs

@@ -0,0 +1,15 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[crate_type="lib"]
+
+pub fn
+foo() -> i32
+{ 45 }