auto merge of #13948 : huonw/rust/test-regex-filter, r=alexcrichton

The regex change is fully backwards compatible, since test names are Rust
identifiers + `:`, and hence not special regex characters.

(See commits for details.)

mk/crates.mk

@@ -79,7 +79,7 @@ DEPS_collections := std rand
 DEPS_fourcc := syntax std
 DEPS_hexfloat := syntax std
 DEPS_num := std rand
-DEPS_test := std collections getopts serialize term time
+DEPS_test := std collections getopts serialize term time regex
 DEPS_time := std serialize
 DEPS_rand := std
 DEPS_url := std collections

src/compiletest/common.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use regex::Regex;
+
 #[deriving(Clone, Eq)]
 pub enum mode {
     mode_compile_fail,
@@ -54,7 +56,7 @@ pub struct config {
     pub run_ignored: bool,
 
     // Only run tests that match this filter
-    pub filter: Option<~str>,
+    pub filter: Option<Regex>,
 
     // Write out a parseable log of tests that were run
     pub logfile: Option<Path>,

src/compiletest/compiletest.rs

@@ -24,6 +24,8 @@ extern crate log;
 extern crate green;
 extern crate rustuv;
 
+extern crate regex;
+
 use std::os;
 use std::io;
 use std::io::fs;
@@ -117,6 +119,19 @@ pub fn parse_config(args: Vec<~str> ) -> config {
         Path::new(m.opt_str(nm).unwrap())
     }
 
+    let filter = if !matches.free.is_empty() {
+        let s = matches.free.get(0).as_slice();
+        match regex::Regex::new(s) {
+            Ok(re) => Some(re),
+            Err(e) => {
+                println!("failed to parse filter /{}/: {}", s, e);
+                fail!()
+            }
+        }
+    } else {
+        None
+    };
+
     config {
         compile_lib_path: matches.opt_str("compile-lib-path").unwrap(),
         run_lib_path: matches.opt_str("run-lib-path").unwrap(),
@@ -129,12 +144,7 @@ pub fn parse_config(args: Vec<~str> ) -> config {
         stage_id: matches.opt_str("stage-id").unwrap(),
         mode: str_mode(matches.opt_str("mode").unwrap()),
         run_ignored: matches.opt_present("ignored"),
-        filter:
-            if !matches.free.is_empty() {
-                 Some((*matches.free.get(0)).clone())
-            } else {
-                None
-            },
+        filter: filter,
         logfile: matches.opt_str("logfile").map(|s| Path::new(s)),
         save_metrics: matches.opt_str("save-metrics").map(|s| Path::new(s)),
         ratchet_metrics:
@@ -170,7 +180,7 @@ pub fn log_config(config: &config) {
     logv(c, format!("stage_id: {}", config.stage_id));
     logv(c, format!("mode: {}", mode_str(config.mode)));
     logv(c, format!("run_ignored: {}", config.run_ignored));
-    logv(c, format!("filter: {}", opt_str(&config.filter)));
+    logv(c, format!("filter: {}", if config.filter.is_some() { "(regex)" } else { "(none)" }));
     logv(c, format!("runtool: {}", opt_str(&config.runtool)));
     logv(c, format!("host-rustcflags: {}", opt_str(&config.host_rustcflags)));
     logv(c, format!("target-rustcflags: {}", opt_str(&config.target_rustcflags)));

src/doc/guide-testing.md

@@ -90,10 +90,15 @@ fn test_out_of_bounds_failure() {
 ~~~
 
 A test runner built with the `--test` flag supports a limited set of
-arguments to control which tests are run: the first free argument
-passed to a test runner specifies a filter used to narrow down the set
-of tests being run; the `--ignored` flag tells the test runner to run
-only tests with the `ignore` attribute.
+arguments to control which tests are run:
+
+- the first free argument passed to a test runner is interpreted as a
+  regular expression
+  ([syntax reference](regex/index.html#syntax))
+  and is used to narrow down the set of tests being run. Note: a plain
+  string is a valid regular expression that matches itself.
+- the `--ignored` flag tells the test runner to run only tests with the
+  `ignore` attribute.
 
 ## Parallelism
 
@@ -146,16 +151,31 @@ result: FAILED. 1 passed; 1 failed; 0 ignored
 
 ### Running a subset of tests
 
+Using a plain string:
+
+~~~ {.notrust}
+$ mytests mytest23
+
+running 1 tests
+running driver::tests::mytest23 ... ok
+
+result: ok. 1 passed; 0 failed; 0 ignored
+~~~
+
+Using some regular expression features:
+
 ~~~ {.notrust}
-$ mytests mytest1
+$ mytests 'mytest[145]'
 
-running 11 tests
+running 13 tests
 running driver::tests::mytest1 ... ok
+running driver::tests::mytest4 ... ok
+running driver::tests::mytest5 ... ok
 running driver::tests::mytest10 ... ignored
 ... snip ...
 running driver::tests::mytest19 ... ok
 
-result: ok. 11 passed; 0 failed; 1 ignored
+result: ok. 13 passed; 0 failed; 1 ignored
 ~~~
 
 # Microbenchmarking