diff --git a/src/crufty.rs b/src/crufty.rs
index b946485..2ebf1df 100644
--- a/src/crufty.rs
+++ b/src/crufty.rs
@@ -1,3 +1,4 @@
+pub mod artifact_type;
 pub mod cleaner;
 pub mod cli;
 pub mod estimator;
diff --git a/src/crufty/artifact_type.rs b/src/crufty/artifact_type.rs
new file mode 100644
index 0000000..78ed9cb
--- /dev/null
+++ b/src/crufty/artifact_type.rs
@@ -0,0 +1,21 @@
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub enum ArtifactType {
+  Rust,
+  Scala,
+  Custom { pattern: &'static str },
+}
+
+pub fn builtin() -> [ArtifactType; 2] {
+  [ArtifactType::Rust, ArtifactType::Scala]
+}
+
+impl ArtifactType {
+  pub fn pattern(&self) -> &'static str {
+    match self {
+      ArtifactType::Rust => "**/target",
+      ArtifactType::Scala => "**/target",
+      ArtifactType::Custom { pattern } => pattern,
+    }
+  }
+}
diff --git a/src/crufty/fetcher.rs b/src/crufty/fetcher.rs
index 249bebc..b7b9ecb 100644
--- a/src/crufty/fetcher.rs
+++ b/src/crufty/fetcher.rs
@@ -1,43 +1,56 @@
 use std::path::PathBuf;
 
-use globset::{Glob, GlobSetBuilder};
+use super::artifact_type::ArtifactType;
+use globset::{Glob, GlobSet, GlobSetBuilder};
 use walkdir::WalkDir;
 
 use super::types::ArtifactCandidate;
 
-pub fn fetch_artifacts(root_path: &PathBuf) -> Vec<ArtifactCandidate> {
+fn mk_global_set(
+  artifact_types: Vec<ArtifactType>,
+) -> Result<GlobSet, globset::Error> {
   let mut builder = GlobSetBuilder::new();
-  // FIX-ME hardcoded pattern for Rust
-  builder.add(Glob::new("**/target").unwrap());
-
-  let globset = builder.build().unwrap();
-
-  WalkDir::new(root_path)
-    .into_iter()
-    .filter_map(|entry_result| match entry_result {
-      Err(_) => None,
-      Ok(entry) if !entry.path().is_dir() => None,
-      Ok(entry) => {
-        let path = entry.into_path();
-        let rel_path = path.strip_prefix(root_path).ok()?;
-        match globset.is_match(&rel_path) {
-          true => Some(ArtifactCandidate::new(path)),
-          false => None,
+  for art_type in artifact_types {
+    builder.add(Glob::new(art_type.pattern())?);
+  }
+  builder.build()
+}
+
+pub fn fetch_artifacts(
+  root_path: &PathBuf,
+  artifact_types: Vec<ArtifactType>,
+) -> Vec<ArtifactCandidate> {
+  match mk_global_set(artifact_types) {
+    Err(_) => vec![],
+    Ok(globset) => WalkDir::new(root_path)
+      .into_iter()
+      .filter_map(|entry_result| match entry_result {
+        Err(_) => None,
+        Ok(entry) if !entry.path().is_dir() => None,
+        Ok(entry) => {
+          let path = entry.into_path();
+          let rel_path = path.strip_prefix(root_path).ok()?;
+          match globset.is_match(&rel_path) {
+            true => Some(ArtifactCandidate::new(path)),
+            false => None,
+          }
         }
-      }
-    })
-    .collect()
+      })
+      .collect(),
+  }
 }
 
 #[cfg(test)]
 mod tests {
 
-  use assert_fs::prelude::*;
   use assert_fs::{
     fixture::{ChildPath, PathChild},
+    prelude::*,
     TempDir,
   };
 
+  use crate::crufty::artifact_type::ArtifactType;
+
   use super::{fetch_artifacts, ArtifactCandidate};
 
   fn mk_subpath(base: &TempDir, rel_path: &str) -> ChildPath {
@@ -46,6 +59,14 @@ mod tests {
     sub
   }
 
+  fn only_rust_projects() -> Vec<ArtifactType> {
+    vec![ArtifactType::Rust]
+  }
+
+  fn custom_project(pattern: &'static str) -> Vec<ArtifactType> {
+    vec![ArtifactType::Custom { pattern }]
+  }
+
   fn mk_rust_project<P: PathChild>(base: &P) {
     base.child("target").create_dir_all().unwrap();
     base.child("Cargo.toml").touch().unwrap();
@@ -53,12 +74,12 @@ mod tests {
 
   #[test]
   fn test_simple_rust_project_being_scanned_folder() {
-    // given
+    // given there is a single rust project in the folder
     let temp = TempDir::new().unwrap();
     mk_rust_project(&temp);
 
-    // when
-    let results = fetch_artifacts(&temp.to_path_buf());
+    // when we search for Rust artifacts
+    let results = fetch_artifacts(&temp.to_path_buf(), only_rust_projects());
 
     // then
     assert_eq!(results.len(), 1, "Expected exactly one artifact");
@@ -67,6 +88,12 @@ mod tests {
     let expected = ArtifactCandidate::new(expected_path);
     assert_eq!(&results[0], &expected);
 
+    // when we search for projects other than Rust
+    let results =
+      fetch_artifacts(&temp.to_path_buf(), custom_project("**/bla"));
+    // then
+    assert_eq!(results.len(), 0, "Expected zero artifacts");
+
     temp.close().unwrap();
   }
 
@@ -81,8 +108,9 @@ mod tests {
     let project3 = mk_subpath(&temp, "work/project3");
     mk_rust_project(&project3);
 
-    // when
-    let mut results = fetch_artifacts(&temp.to_path_buf());
+    // when we search for Rust artifacts
+    let mut results =
+      fetch_artifacts(&temp.to_path_buf(), only_rust_projects());
 
     // then
     assert_eq!(results.len(), 3, "Expected exactly three artifacts");
@@ -107,6 +135,12 @@ mod tests {
     let expected_3 = ArtifactCandidate::new(expected_path_3);
     assert_eq!(&results[2], &expected_3);
 
+    // when we search for projects other than Rust
+    let results =
+      fetch_artifacts(&temp.to_path_buf(), custom_project("**/bla"));
+    // then
+    assert_eq!(results.len(), 0, "Expected zero artifacts");
+
     temp.close().unwrap();
   }
 }
diff --git a/src/main.rs b/src/main.rs
index 3a7d9dd..3770293 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 use clap::Parser;
 use console::{style, Term};
+use crufty::artifact_type;
 use crufty::cleaner::{self, CleanupResult};
 use crufty::cli::{Cli, Commands};
 use crufty::estimator::{estimate, total_size};
@@ -34,7 +35,7 @@ fn scan() -> io::Result<()> {
     .write_line(&format!("[+] Scanning: {}", style(path.display()).bold()))?;
 
   let spinner = ui::create_spinner("collecting artifacts");
-  let mut artifacts = fetch_artifacts(&path);
+  let mut artifacts = fetch_artifacts(&path, artifact_type::builtin().to_vec());
   spinner.finish_and_clear();
 
   term.write_line("")?;
@@ -82,7 +83,7 @@ fn clean() -> io::Result<()> {
   let path = env::current_dir()?;
 
   let spinner = ui::create_spinner("collecting artifacts");
-  let mut artifacts = fetch_artifacts(&path);
+  let mut artifacts = fetch_artifacts(&path, artifact_type::builtin().to_vec());
   spinner.finish_and_clear();
 
   if artifacts.is_empty() {