4 files changed, 18 insertions, 9 deletions
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index f297b44e..493f8d50 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -1,5 +1,5 @@
 use crate::{
-    commands,
+    commands::{self, OnKeyCallback},
     compositor::{Component, Context, Event, EventResult},
     job::{self, Callback},
     key,
@@ -37,7 +37,7 @@ use super::{document::LineDecoration, lsp::SignatureHelp};
 
 pub struct EditorView {
     pub keymaps: Keymaps,
-    on_next_key: Option<Box<dyn FnOnce(&mut commands::Context, KeyEvent)>>,
+    on_next_key: Option<OnKeyCallback>,
     pseudo_pending: Vec<KeyEvent>,
     last_insert: (commands::MappableCommand, Vec<InsertEvent>),
     pub(crate) completion: Option<Completion>,
diff --git a/helix-term/src/ui/menu.rs b/helix-term/src/ui/menu.rs
index 3ae00703..8aa10c08 100644
--- a/helix-term/src/ui/menu.rs
+++ b/helix-term/src/ui/menu.rs
@@ -43,6 +43,8 @@ impl Item for PathBuf {
     }
 }
 
+pub type MenuCallback<T> = Box<dyn Fn(&mut Editor, Option<&T>, MenuEvent)>;
+
 pub struct Menu<T: Item> {
     options: Vec<T>,
     editor_data: T::Data,
@@ -55,7 +57,7 @@ pub struct Menu<T: Item> {
 
     widths: Vec<Constraint>,
 
-    callback_fn: Box<dyn Fn(&mut Editor, Option<&T>, MenuEvent)>,
+    callback_fn: MenuCallback<T>,
 
     scroll: usize,
     size: (u16, u16),
diff --git a/helix-term/src/ui/picker.rs b/helix-term/src/ui/picker.rs
index 5190fc53..803e2d65 100644
--- a/helix-term/src/ui/picker.rs
+++ b/helix-term/src/ui/picker.rs
@@ -70,6 +70,8 @@ impl From<DocumentId> for PathOrId {
     }
 }
 
+type FileCallback<T> = Box<dyn Fn(&Editor, &T) -> Option<FileLocation>>;
+
 /// File path and range of lines (used to align and highlight lines)
 pub type FileLocation = (PathOrId, Option<(usize, usize)>);
 
@@ -80,7 +82,7 @@ pub struct FilePicker<T: Item> {
     preview_cache: HashMap<PathBuf, CachedPreview>,
     read_buffer: Vec<u8>,
     /// Given an item in the picker, return the file path and line number to display.
-    file_fn: Box<dyn Fn(&Editor, &T) -> Option<FileLocation>>,
+    file_fn: FileCallback<T>,
 }
 
 pub enum CachedPreview {
@@ -394,6 +396,8 @@ impl Ord for PickerMatch {
     }
 }
 
+type PickerCallback<T> = Box<dyn Fn(&mut Context, &T, Action)>;
+
 pub struct Picker<T: Item> {
     options: Vec<T>,
     editor_data: T::Data,
@@ -415,7 +419,7 @@ pub struct Picker<T: Item> {
     /// Constraints for tabular formatting
     widths: Vec<Constraint>,
 
-    callback_fn: Box<dyn Fn(&mut Context, &T, Action)>,
+    callback_fn: PickerCallback<T>,
 }
 
 impl<T: Item> Picker<T> {
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index 5fb6745a..f438231f 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -14,8 +14,11 @@ use helix_view::{
     Editor,
 };
 
-pub type Completion = (RangeFrom<usize>, Cow<'static, str>);
 type PromptCharHandler = Box<dyn Fn(&mut Prompt, char, &Context)>;
+pub type Completion = (RangeFrom<usize>, Cow<'static, str>);
+type CompletionFn = Box<dyn FnMut(&Editor, &str) -> Vec<Completion>>;
+type CallbackFn = Box<dyn FnMut(&mut Context, &str, PromptEvent)>;
+pub type DocFn = Box<dyn Fn(&str) -> Option<Cow<str>>>;
 
 pub struct Prompt {
     prompt: Cow<'static, str>,
@@ -25,9 +28,9 @@ pub struct Prompt {
     selection: Option<usize>,
     history_register: Option<char>,
     history_pos: Option<usize>,
-    completion_fn: Box<dyn FnMut(&Editor, &str) -> Vec<Completion>>,
-    callback_fn: Box<dyn FnMut(&mut Context, &str, PromptEvent)>,
-    pub doc_fn: Box<dyn Fn(&str) -> Option<Cow<str>>>,
+    completion_fn: CompletionFn,
+    callback_fn: CallbackFn,
+    pub doc_fn: DocFn,
     next_char_handler: Option<PromptCharHandler>,
 }