Make the events module optional feature

Cargo.toml

@@ -26,12 +26,12 @@ all-features = true
 # Features
 #
 [features]
-default = ["bracketed-paste", "windows"]
+default = ["bracketed-paste", "windows", "events"]
 windows = ["winapi", "crossterm_winapi"]
 bracketed-paste = []
 event-stream = ["futures-core"]
 use-dev-tty = ["filedescriptor"]
-
+events = ["mio", "signal-hook", "signal-hook-mio"]
 #
 # Shared dependencies
 #
@@ -59,10 +59,10 @@ crossterm_winapi = { version = "0.9", optional = true }
 #
 [target.'cfg(unix)'.dependencies]
 libc = "0.2"
-signal-hook = { version = "0.3.13" }
+signal-hook = { version = "0.3.13", optional = true }
 filedescriptor = { version = "0.8", optional = true }
-mio = { version = "0.8", features = ["os-poll"] }
-signal-hook-mio = { version = "0.2.3", features = ["support-v0_8"] }
+mio = { version = "0.8", features = ["os-poll"], optional = true }
+signal-hook-mio = { version = "0.2.3", features = ["support-v0_8"], optional = true }
 
 #
 # Dev dependencies (examples, ...)

README.md

@@ -144,16 +144,22 @@ features = ["event-stream"]
 |:---------------|:---------------------------------------------|
 | `event-stream` | `futures::Stream` producing `Result<Event>`. |
 | `serde`        | (De)serializing of events.                   |
+| `events`        | Reading input/system events (enabled by default) |
+| `filedescriptor` | Use raw filedescriptor for all events rather then mio dependency |
+
+
+To use crossterm as a very tin layer you can disable the `events` feature or use `filedescriptor` feature. 
+This can disable `mio` / `signal-hook` / `signal-hook-mio` dependencies.
 
 ### Dependency Justification
 
 | Dependency     | Used for                                                                         | Included                              |
 |:---------------|:---------------------------------------------------------------------------------|:--------------------------------------|
 | `bitflags`     | `KeyModifiers`, those are differ based on input.                                 | always                                |
 | `parking_lot`  | locking `RwLock`s with a timeout, const mutexes.                                 | always                                |
-| `libc`         | UNIX terminal_size/raw modes/set_title and several other low level functionality. | UNIX only                             |
-| `Mio`          | event readiness polling, waking up poller                                        | UNIX only                             |
-| `signal-hook`  | signal-hook is used to handle terminal resize SIGNAL with Mio.                    | UNIX only                             |
+| `libc`         | UNIX terminal_size/raw modes/set_title and several other low level functionality. | optional (`events` feature), UNIX only |
+| `Mio`          | event readiness polling, waking up poller                                        | optional (`events` feature), UNIX only |
+| `signal-hook`  | signal-hook is used to handle terminal resize SIGNAL with Mio.                   |  optional (`events` feature),UNIX only |
 | `winapi`       | Used for low-level windows system calls which ANSI codes can't replace           | windows only                          |
 | `futures-core` | For async stream of events                                                       | only with `event-stream` feature flag |
 | `serde`        | ***ser***ializing and ***de***serializing of events                              | only with `serde` feature flag        |

src/cursor.rs

@@ -48,8 +48,6 @@ use std::fmt;
 use crate::Result;
 use crate::{csi, impl_display, Command};
 
-pub use sys::position;
-
 pub(crate) mod sys;
 
 /// A command that moves the terminal cursor to the given position (column, row).
@@ -432,7 +430,7 @@ mod tests {
     use crate::execute;
 
     use super::{
-        position, MoveDown, MoveLeft, MoveRight, MoveTo, MoveUp, RestorePosition, SavePosition,
+        sys::position, MoveDown, MoveLeft, MoveRight, MoveTo, MoveUp, RestorePosition, SavePosition,
     };
 
     // Test is disabled, because it's failing on Travis

src/cursor/sys.rs

@@ -1,6 +1,7 @@
 //! This module provides platform related functions.
 
 #[cfg(unix)]
+#[cfg(feature = "events")]
 pub use self::unix::position;
 #[cfg(windows)]
 pub use self::windows::position;
@@ -14,4 +15,5 @@ pub(crate) use self::windows::{
 pub(crate) mod windows;
 
 #[cfg(unix)]
+#[cfg(feature = "events")]
 pub(crate) mod unix;