move complete_file_name() helper into tools.rs

src/tools.rs

@@ -259,3 +259,56 @@ pub fn required_integer_param<'a>(param: &'a Value, name: &str) -> Result<i64, E
         None => bail!("missing parameter '{}'", name),
     }
 }
+
+pub fn complete_file_name(arg: &str) -> Vec<String> {
+
+    let mut result = vec![];
+
+    use nix::fcntl::OFlag;
+    use nix::sys::stat::Mode;
+    use nix::fcntl::AtFlags;
+
+    let mut dirname = std::path::PathBuf::from(arg);
+
+    let is_dir = match nix::sys::stat::fstatat(libc::AT_FDCWD, &dirname, AtFlags::empty()) {
+        Ok(stat) => (stat.st_mode & libc::S_IFMT) == libc::S_IFDIR,
+        Err(_) => false,
+    };
+
+    if !is_dir {
+        if let Some(parent) = dirname.parent() {
+            dirname = parent.to_owned();
+        }
+    }
+
+    let mut dir = match nix::dir::Dir::openat(libc::AT_FDCWD, &dirname, OFlag::O_DIRECTORY, Mode::empty()) {
+        Ok(d) => d,
+        Err(_) => return result,
+    };
+
+    for item in dir.iter() {
+        if let Ok(entry) = item {
+            if let Ok(name) = entry.file_name().to_str() {
+                if name == "." || name == ".." { continue; }
+                let mut newpath = dirname.clone();
+                newpath.push(name);
+
+                if let Ok(stat) = nix::sys::stat::fstatat(libc::AT_FDCWD, &newpath, AtFlags::empty()) {
+                    if (stat.st_mode & libc::S_IFMT) == libc::S_IFDIR {
+                        newpath.push("");
+                        if let Some(newpath) = newpath.to_str() {
+                            result.push(newpath.to_owned());
+                        }
+                        continue;
+                     }
+                }
+                if let Some(newpath) = newpath.to_str() {
+                    result.push(newpath.to_owned());
+                }
+
+             }
+        }
+    }
+
+    result
+}