diff --git a/blocks.txt b/blocks.txt
new file mode 100644
index 0000000..de54ac6
--- /dev/null
+++ b/blocks.txt
@@ -0,0 +1 @@
+example.com
diff --git a/mutes.txt b/mutes.txt
new file mode 100644
index 0000000..db90029
--- /dev/null
+++ b/mutes.txt
@@ -0,0 +1,2 @@
+example.net
+example.org
diff --git a/src/list.rs b/src/list.rs
deleted file mode 100644
index 7a581ff..0000000
--- a/src/list.rs
+++ /dev/null
@@ -1,53 +0,0 @@
-use std::collections::HashMap;
-
-mod source;
-mod tests;
-
-pub use source::*;
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub enum Action {
-    Block,
-    Silence,
-}
-
-#[derive(Debug, Default, Eq, PartialEq)]
-pub struct ActionTrust {
-    pub block: u16,
-    pub silence: u16,
-}
-
-impl ActionTrust {
-    pub fn add_action(&mut self, action: Action, trust: u16) -> &mut Self {
-        match action {
-            Action::Block => self.block += trust,
-            Action::Silence => self.silence += trust,
-        }
-        self
-    }
-}
-
-impl From<(u16, u16)> for ActionTrust {
-    fn from(value: (u16, u16)) -> Self {
-        Self {
-            block: value.0,
-            silence: value.1,
-        }
-    }
-}
-
-#[derive(Debug, Default, Eq, PartialEq)]
-pub struct ModerationList(pub HashMap<String, ActionTrust>);
-
-impl ModerationList {
-    pub fn add_source(&mut self, src: Source) -> &mut Self {
-        let items = src.actions.into_iter();
-
-        for (host, action) in items {
-            let entry = self.0.entry(host).or_default();
-            entry.add_action(action, src.trust);
-        }
-
-        self
-    }
-}
diff --git a/src/list/source.rs b/src/list/source.rs
deleted file mode 100644
index 3afed2f..0000000
--- a/src/list/source.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-use std::{collections::HashMap, fs};
-
-use super::*;
-
-#[derive(Debug, PartialEq, Eq)]
-pub struct Source {
-    pub actions: HashMap<String, Action>,
-    pub trust: u16,
-}
-
-impl Default for Source {
-    fn default() -> Self {
-        Self {
-            actions: HashMap::new(),
-            trust: 100,
-        }
-    }
-}
-
-impl From<HashMap<String, Action>> for Source {
-    fn from(map: HashMap<String, Action>) -> Self {
-        Self {
-            actions: map,
-            trust: 100,
-        }
-    }
-}
-
-impl Source {
-    pub fn build(map: HashMap<String, Action>, trust: u16) -> Self {
-        let mut src = Self::from(map);
-        src.trust = trust;
-        src
-    }
-
-    pub fn add_from_file(&mut self, path: &str, action: Action) -> &mut Self {
-        let contents = fs::read_to_string(path).unwrap();
-        for host in contents.lines().filter(|line| !line.is_empty()) {
-            self.add_action(host, action);
-        }
-
-        self
-    }
-
-    fn add_action(&mut self, host: &str, action: Action) -> &mut Self {
-        self.actions.insert(host.to_string(), action);
-        self
-    }
-}
\ No newline at end of file
diff --git a/src/list/tests.rs b/src/list/tests.rs
deleted file mode 100644
index 98bc145..0000000
--- a/src/list/tests.rs
+++ /dev/null
@@ -1,144 +0,0 @@
-#![cfg(test)]
-
-use std::collections::HashMap;
-
-use super::*;
-
-#[test]
-fn add_action() {
-    let mut at = ActionTrust::default();
-
-    at.add_action(Action::Block, 123)
-        .add_action(Action::Silence, 456);
-
-    let test_at = ActionTrust {
-        block: 123,
-        silence: 456,
-    };
-
-    assert_eq!(at, test_at);
-}
-
-#[test]
-fn add_action_overlap() {
-    let mut at = ActionTrust::default();
-
-    at.add_action(Action::Block, 123)
-        .add_action(Action::Block, 333)
-        .add_action(Action::Silence, 123);
-
-    let test_at = ActionTrust {
-        block: 456,
-        silence: 123,
-    };
-
-    assert_eq!(at, test_at);
-}
-
-#[test]
-fn source_new_from_hashmap() {
-    let src1 = Source::from(HashMap::from([
-        (String::from("example.com"), Action::Block),
-        (String::from("example.org"), Action::Silence),
-        (String::from("example.net"), Action::Block),
-    ]));
-
-    assert_eq!(
-        src1.actions,
-        HashMap::from([
-            (String::from("example.com"), Action::Block),
-            (String::from("example.org"), Action::Silence),
-            (String::from("example.net"), Action::Block),
-        ])
-    );
-
-    assert_eq!(src1.trust, 100);
-}
-
-#[test]
-fn source_build_from_hashmap() {
-    let src2 = Source::build(
-        HashMap::from([
-            (String::from("example.com"), Action::Block),
-            (String::from("example.org"), Action::Silence),
-            (String::from("example.net"), Action::Block),
-        ]),
-        123,
-    );
-
-    assert_eq!(
-        src2.actions,
-        HashMap::from([
-            (String::from("example.com"), Action::Block),
-            (String::from("example.org"), Action::Silence),
-            (String::from("example.net"), Action::Block),
-        ])
-    );
-    assert_eq!(src2.trust, 123);
-}
-
-#[test]
-fn source_add_from_file() {
-    let mut src = Source::default();
-    src.add_from_file("example_blocklist1.txt", Action::Block)
-        .add_from_file("example_mutelist1.txt", Action::Silence);
-
-    let test_src = Source::from(HashMap::from([
-        (String::from("example.com"), Action::Block),
-        (String::from("example.org"), Action::Block),
-        (String::from("example.net"), Action::Silence),
-    ]));
-
-    assert_eq!(test_src, src);
-}
-
-#[test]
-fn build_moderation_list() {
-    let mut ml = ModerationList::default();
-
-    let src1 = Source::from(HashMap::from([
-        (String::from("example.com"), Action::Block),
-        (String::from("example.org"), Action::Silence),
-        (String::from("example.net"), Action::Block),
-    ]));
-
-    let mut src2 = Source::default();
-    src2.add_from_file("example_blocklist1.txt", Action::Block)
-        .add_from_file("example_mutelist1.txt", Action::Silence);
-
-    ml.add_source(src1).add_source(src2);
-
-    let test_ml = ModerationList(HashMap::from([
-        (String::from("example.com"), ActionTrust::from((200, 0))),
-        (String::from("example.org"), ActionTrust::from((100, 100))),
-        (String::from("example.net"), ActionTrust::from((100, 100))),
-    ]));
-
-    assert_eq!(ml, test_ml);
-
-    let src3 = Source::build(
-        HashMap::from([
-            (String::from("example.com"), Action::Block),
-            (String::from("example.org"), Action::Silence),
-        ]),
-        200,
-    );
-
-    let src4 = Source::build(
-        HashMap::from([
-            (String::from("example.com"), Action::Block),
-            (String::from("example.net"), Action::Silence),
-        ]),
-        50,
-    );
-
-    ml.add_source(src3).add_source(src4);
-
-    let test_ml = ModerationList(HashMap::from([
-        (String::from("example.com"), ActionTrust::from((450, 0))),
-        (String::from("example.org"), ActionTrust::from((100, 300))),
-        (String::from("example.net"), ActionTrust::from((100, 150))),
-    ]));
-
-    assert_eq!(ml, test_ml);
-}
diff --git a/src/main.rs b/src/main.rs
index 673afcb..10336a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 // src/main.rs
 
-mod list;
+mod manip;
+mod tests;
 
 fn main() {
     println!("Hello, world!");
diff --git a/src/manip.rs b/src/manip.rs
new file mode 100644
index 0000000..ed930bc
--- /dev/null
+++ b/src/manip.rs
@@ -0,0 +1,133 @@
+use std::{collections::HashMap, fs};
+
+use log::error;
+
+// ENUMS
+
+/// Specifies a moderation action, whether block or silence
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum ModAction {
+    Block,
+    Silence,
+}
+
+// STRUCTS
+
+/// Indicates weight of moderation action on a host
+#[derive(Debug, Default, Eq, PartialEq)]
+pub struct ModActionTrust {
+    pub block: u16,
+    pub silence: u16,
+}
+
+impl ModActionTrust {
+    pub fn add_action(&mut self, action: ModAction, trust: u16) -> &mut Self {
+        match action {
+            ModAction::Block => self.block += trust,
+            ModAction::Silence => self.silence += trust,
+        }
+        self
+    }
+}
+
+impl From<(u16, u16)> for ModActionTrust {
+    fn from(value: (u16, u16)) -> Self {
+        Self {
+            block: value.0,
+            silence: value.1,
+        }
+    }
+}
+
+/// Contains a mapping of hosts to moderation actions as well as a trust value,
+/// which is used to weight moderation actions when building a mod map
+#[derive(Debug, PartialEq, Eq)]
+pub struct ModSource {
+    pub actions: HashMap<String, ModAction>,
+    pub trust: u16,
+}
+
+impl Default for ModSource {
+    fn default() -> Self {
+        Self {
+            actions: HashMap::new(),
+            trust: 100,
+        }
+    }
+}
+
+impl From<HashMap<String, ModAction>> for ModSource {
+    fn from(map: HashMap<String, ModAction>) -> Self {
+        Self {
+            actions: map,
+            trust: 100,
+        }
+    }
+}
+
+impl ModSource {
+    fn add_action(&mut self, host: &str, action: ModAction) -> &mut Self {
+        self.actions.insert(host.to_string(), action);
+        self
+    }
+
+    pub fn build(map: HashMap<String, ModAction>, trust: u16) -> Self {
+        let mut src = Self::from(map);
+        src.trust = trust;
+        src
+    }
+
+    pub fn import_file(&mut self, path: &str, action: ModAction) -> &mut Self {
+        let contents = fs::read_to_string(path).unwrap();
+        for host in contents.lines().filter(|line| !line.is_empty()) {
+            self.add_action(host, action);
+        }
+
+        self
+    }
+}
+
+/// A map of hosts (as strings) to weighted mod actions
+#[derive(Debug, Default, Eq, PartialEq)]
+pub struct ModMap(pub HashMap<String, ModActionTrust>);
+
+impl ModMap {
+    pub fn add_source(&mut self, src: ModSource) -> &mut Self {
+        let items = src.actions.into_iter();
+
+        for (host, action) in items {
+            let entry = self.0.entry(host).or_default();
+            entry.add_action(action, src.trust);
+        }
+
+        self
+    }
+
+    pub fn export_file(self, block_path: &str, mute_path: &str, heat: (u16, u16)) -> std::io::Result<()> {
+        if self.0.is_empty() {
+            error!("Nothing to export!");
+            return Ok(())
+        }
+
+        let (block_thresh, mute_thresh) = heat;
+        let mut block_output: String = String::default();
+        let mut mute_output: String = String::default();
+
+        for item in self.0.into_iter() {
+            let (block_trust, mute_trust) = (item.1.block, item.1.silence);
+
+            if block_trust >= block_thresh {
+                block_output.push_str(&(item.0.clone() + "\n"));
+            }
+
+            if mute_trust >= mute_thresh {
+                mute_output.push_str(&(item.0.clone() + "\n"));
+            }
+        }
+
+        fs::write(block_path, block_output)?;
+        fs::write(mute_path, mute_output)?;
+
+        Ok(())
+    }
+}
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 0000000..5ac1536
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1 @@
+mod manip;
\ No newline at end of file
diff --git a/src/tests/manip.rs b/src/tests/manip.rs
new file mode 100644
index 0000000..b58978a
--- /dev/null
+++ b/src/tests/manip.rs
@@ -0,0 +1,200 @@
+#![cfg(test)]
+
+use std::{collections::HashMap, fs};
+
+use crate::manip::*;
+
+#[test]
+fn modaction_add() {
+    let mut at = ModActionTrust::default();
+
+    at.add_action(ModAction::Block, 123)
+        .add_action(ModAction::Silence, 456);
+
+    let test_at = ModActionTrust {
+        block: 123,
+        silence: 456,
+    };
+
+    assert_eq!(at, test_at);
+}
+
+#[test]
+fn modaction_combine() {
+    let mut at = ModActionTrust::default();
+
+    at.add_action(ModAction::Block, 123)
+        .add_action(ModAction::Block, 333)
+        .add_action(ModAction::Silence, 123);
+
+    let test_at = ModActionTrust {
+        block: 456,
+        silence: 123,
+    };
+
+    assert_eq!(at, test_at);
+}
+
+#[test]
+fn modsource_from_map() {
+    let src1 = ModSource::from(HashMap::from([
+        (String::from("example.com"), ModAction::Block),
+        (String::from("example.org"), ModAction::Silence),
+        (String::from("example.net"), ModAction::Block),
+    ]));
+
+    assert_eq!(
+        src1.actions,
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.org"), ModAction::Silence),
+            (String::from("example.net"), ModAction::Block),
+        ])
+    );
+
+    assert_eq!(src1.trust, 100);
+}
+
+#[test]
+fn modsource_from_map_and_trust() {
+    let src2 = ModSource::build(
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.org"), ModAction::Silence),
+            (String::from("example.net"), ModAction::Block),
+        ]),
+        123,
+    );
+
+    assert_eq!(
+        src2.actions,
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.org"), ModAction::Silence),
+            (String::from("example.net"), ModAction::Block),
+        ])
+    );
+    assert_eq!(src2.trust, 123);
+}
+
+#[test]
+fn modsource_from_file() {
+    let mut src = ModSource::default();
+    src.import_file("example_blocklist1.txt", ModAction::Block)
+        .import_file("example_mutelist1.txt", ModAction::Silence);
+
+    let test_src = ModSource::from(HashMap::from([
+        (String::from("example.com"), ModAction::Block),
+        (String::from("example.org"), ModAction::Block),
+        (String::from("example.net"), ModAction::Silence),
+    ]));
+
+    assert_eq!(test_src, src);
+}
+
+#[test]
+fn modmap_from_modsource() {
+    let mut ml = ModMap::default();
+
+    let src1 = ModSource::from(HashMap::from([
+        (String::from("example.com"), ModAction::Block),
+        (String::from("example.org"), ModAction::Silence),
+        (String::from("example.net"), ModAction::Block),
+    ]));
+
+    let mut src2 = ModSource::default();
+    src2.import_file("example_blocklist1.txt", ModAction::Block)
+        .import_file("example_mutelist1.txt", ModAction::Silence);
+
+    ml.add_source(src1).add_source(src2);
+
+    let test_ml = ModMap(HashMap::from([
+        (String::from("example.com"), ModActionTrust::from((200, 0))),
+        (
+            String::from("example.org"),
+            ModActionTrust::from((100, 100)),
+        ),
+        (
+            String::from("example.net"),
+            ModActionTrust::from((100, 100)),
+        ),
+    ]));
+
+    assert_eq!(ml, test_ml);
+
+    let src3 = ModSource::build(
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.org"), ModAction::Silence),
+        ]),
+        200,
+    );
+
+    let src4 = ModSource::build(
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.net"), ModAction::Silence),
+        ]),
+        50,
+    );
+
+    ml.add_source(src3).add_source(src4);
+
+    let test_ml = ModMap(HashMap::from([
+        (String::from("example.com"), ModActionTrust::from((450, 0))),
+        (
+            String::from("example.org"),
+            ModActionTrust::from((100, 300)),
+        ),
+        (
+            String::from("example.net"),
+            ModActionTrust::from((100, 150)),
+        ),
+    ]));
+
+    assert_eq!(ml, test_ml);
+}
+
+#[test]
+fn modmap_export_txt() {
+    let mut ml = ModMap::default();
+
+    let src1 = ModSource::from(HashMap::from([
+        (String::from("example.com"), ModAction::Block),
+        (String::from("example.org"), ModAction::Silence),
+        (String::from("example.net"), ModAction::Block),
+    ]));
+
+    let mut src2 = ModSource::default();
+    src2.import_file("example_blocklist1.txt", ModAction::Block)
+        .import_file("example_mutelist1.txt", ModAction::Silence);
+
+    let src3 = ModSource::build(
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.org"), ModAction::Silence),
+        ]),
+        200,
+    );
+
+    let src4 = ModSource::build(
+        HashMap::from([
+            (String::from("example.com"), ModAction::Block),
+            (String::from("example.net"), ModAction::Silence),
+        ]),
+        50,
+    );
+
+    ml.add_source(src1)
+        .add_source(src2)
+        .add_source(src3)
+        .add_source(src4);
+
+    let _ = ml.export_file("test_blocks.txt", "test_mutes.txt", (200, 150));
+
+    let blocks: String = fs::read_to_string("test_blocks.txt").unwrap();
+    let mutes: String = fs::read_to_string("test_mutes.txt").unwrap();
+
+    assert_eq!(blocks, "example.com\n");
+    assert!(mutes == "example.org\nexample.net\n" || mutes == "example.net\nexample.org\n");
+}
diff --git a/test_blocks.txt b/test_blocks.txt
new file mode 100644
index 0000000..de54ac6
--- /dev/null
+++ b/test_blocks.txt
@@ -0,0 +1 @@
+example.com
diff --git a/test_mutes.txt b/test_mutes.txt
new file mode 100644
index 0000000..db90029
--- /dev/null
+++ b/test_mutes.txt
@@ -0,0 +1,2 @@
+example.net
+example.org