4 files changed, 29 insertions, 27 deletions

diff --git a/src/backends/clang.rs b/src/backends/clang.rs
index cf42c41..3da7379 100644
--- a/src/backends/clang.rs
+++ b/src/backends/clang.rs
@@ -1,9 +1,8 @@
-use crate::backends::{mk_tmp_dir, Backend, RunError};
+use super::get_binary_by_filename;
+use crate::backends::{Backend, RunError};
 use crate::serde_duration::deserialize_duration;
 use crate::wait::{wait_child, ChildExitStatus};
 use serde_derive::Deserialize;
-use std::collections::hash_map::DefaultHasher;
-use std::hash::{Hash, Hasher};
 use std::io::{Error, ErrorKind, Result as IoResult};
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -31,16 +30,6 @@ fn default_timeout() -> Duration {
     Duration::from_secs(1)
 }
 
-fn get_binary_by_filename(fname: &Path) -> IoResult<PathBuf> {
-    let hashed_fname = {
-        let mut hasher = DefaultHasher::new();
-        fname.hash(&mut hasher);
-        format!("{:x}", hasher.finish())
-    };
-
-    Ok(mk_tmp_dir()?.join(hashed_fname))
-}
-
 impl ClangBackend {
     fn build(&self, fname: &Path) -> IoResult<PathBuf> {
         let binary_fname = get_binary_by_filename(fname)?;
diff --git a/src/backends/clang_c.rs b/src/backends/clang_c.rs
index 7ee5161..a16a38c 100644
--- a/src/backends/clang_c.rs
+++ b/src/backends/clang_c.rs
@@ -1,9 +1,8 @@
-use crate::backends::{mk_tmp_dir, Backend, RunError};
+use super::get_binary_by_filename;
+use crate::backends::{Backend, RunError};
 use crate::serde_duration::deserialize_duration;
 use crate::wait::{wait_child, ChildExitStatus};
 use serde_derive::Deserialize;
-use std::collections::hash_map::DefaultHasher;
-use std::hash::{Hash, Hasher};
 use std::io::{Error, ErrorKind, Result as IoResult};
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -31,16 +30,6 @@ fn default_timeout() -> Duration {
     Duration::from_secs(1)
 }
 
-fn get_binary_by_filename(fname: &Path) -> IoResult<PathBuf> {
-    let hashed_fname = {
-        let mut hasher = DefaultHasher::new();
-        fname.hash(&mut hasher);
-        format!("{:x}", hasher.finish())
-    };
-
-    Ok(mk_tmp_dir()?.join(hashed_fname))
-}
-
 impl ClangCBackend {
     fn build(&self, fname: &Path) -> IoResult<PathBuf> {
         let binary_fname = get_binary_by_filename(fname)?;
diff --git a/src/backends/mod.rs b/src/backends/mod.rs
index 6d402af..be6e5e6 100644
--- a/src/backends/mod.rs
+++ b/src/backends/mod.rs
@@ -1,6 +1,8 @@
 use crate::wait::ChildExitStatus;
 use lazy_static::lazy_static;
+use std::collections::hash_map::DefaultHasher;
 use std::env::temp_dir;
+use std::hash::{Hash, Hasher};
 use std::io::{Error, ErrorKind};
 use std::path::{Path, PathBuf};
 
@@ -38,3 +40,13 @@ fn mk_tmp_dir() -> std::io::Result<&'static std::path::PathBuf> {
     }
     Ok(&*EVR_TMP_DIR)
 }
+
+pub fn get_binary_by_filename(fname: &Path) -> std::io::Result<PathBuf> {
+    let hashed_fname = {
+        let mut hasher = DefaultHasher::new();
+        fname.hash(&mut hasher);
+        format!("{:x}", hasher.finish())
+    };
+
+    Ok(mk_tmp_dir()?.join(hashed_fname))
+}
diff --git a/src/main.rs b/src/main.rs
index 2ad7991..d1484a4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,6 @@
 extern crate lazy_static;
 
-use clap::{App, AppSettings, Arg};
+use clap::{App, AppSettings, Arg, SubCommand};
 use env_logger;
 use log::error;
 use std::io::prelude::*;
@@ -16,6 +16,7 @@ fn main() {
         .author("syn")
         .setting(AppSettings::ColoredHelp)
         .setting(AppSettings::UnifiedHelpMessage)
+        .subcommand(SubCommand::with_name("where"))
         .arg(
             Arg::with_name("src")
                 .required(true)
@@ -48,6 +49,17 @@ fn main() {
         }
     };
 
+    match matches.subcommand() {
+        ("where", Some(_submodule)) => {
+            match backends::get_binary_by_filename(src_path.as_ref()) {
+                Ok(path) => eprintln!("{}", path.display()),
+                Err(e) => error!("No binary: {}", e),
+            }
+            return;
+        }
+        _ => {}
+    }
+
     if src_path.exists() {
         if let Some(backend) = config.get_backend(&src_path) {
             match backend.run(&src_path) {