doc: remove CPU features from man pages

It doesn't really belong in the man page since it's an artifact of a
build/runtime configuration. Moreover, it inhibits reproducible builds.

Fixes #1441

CHANGELOG.md

@@ -57,6 +57,8 @@ Bug fixes:
   Fixes a bug where ripgrep would panic when searching a symlinked directory.
 * [BUG #1439](https://github.com/BurntSushi/ripgrep/issues/1439):
   Improve documentation for ripgrep's automatic stdin detection.
+* [BUG #1441](https://github.com/BurntSushi/ripgrep/issues/1441):
+  Remove CPU features from man page.
 * [BUG #1445](https://github.com/BurntSushi/ripgrep/issues/1445):
   ripgrep now respects ignore rules from .git/info/exclude in worktrees.
 * [BUG #1485](https://github.com/BurntSushi/ripgrep/issues/1485):

build.rs

@@ -86,7 +86,7 @@ fn generate_man_page<P: AsRef<Path>>(outdir: P) -> io::Result<()> {
 
     let githash = git_revision_hash();
     let githash = githash.as_ref().map(|x| &**x);
-    tpl = tpl.replace("{VERSION}", &app::long_version(githash));
+    tpl = tpl.replace("{VERSION}", &app::long_version(githash, false));
 
     File::create(&txt_path)?.write_all(tpl.as_bytes())?;
     let result = process::Command::new("a2x")

crates/core/app.rs

@@ -66,7 +66,7 @@ pub fn app() -> App<'static, 'static> {
     // 'static, but we need to build the version string dynamically. We can
     // fake the 'static lifetime with lazy_static.
     lazy_static! {
-        static ref LONG_VERSION: String = long_version(None);
+        static ref LONG_VERSION: String = long_version(None, true);
     }
 
     let mut app = App::new("ripgrep")
@@ -91,14 +91,19 @@ pub fn app() -> App<'static, 'static> {
 /// If a revision hash is given, then it is used. If one isn't given, then
 /// the RIPGREP_BUILD_GIT_HASH env var is inspected for it. If that isn't set,
 /// then a revision hash is not included in the version string returned.
-pub fn long_version(revision_hash: Option<&str>) -> String {
+///
+/// If `cpu` is true, then the version string will include the compiled and
+/// runtime CPU features.
+pub fn long_version(revision_hash: Option<&str>, cpu: bool) -> String {
     // Do we have a git hash?
     // (Yes, if ripgrep was built on a machine with `git` installed.)
     let hash = match revision_hash.or(option_env!("RIPGREP_BUILD_GIT_HASH")) {
         None => String::new(),
         Some(githash) => format!(" (rev {})", githash),
     };
-    // Put everything together.
+    if !cpu {
+        format!("{}{}", crate_version!(), hash,)
+    } else {
         let runtime = runtime_cpu_features();
         if runtime.is_empty() {
             format!(
@@ -116,6 +121,7 @@ pub fn long_version(revision_hash: Option<&str>) -> String {
                 runtime.join(" ")
             )
         }
+    }
 }
 
 /// Returns the relevant CPU features enabled at compile time.