added MaybeSilent, improved trait impls

Cargo.toml

@@ -2,7 +2,7 @@
 name = "termprogress"
 description = "A terminal progress bar renderer with status and spinners"
 license = "GPL-3.0-or-later"
-version = "0.2.4"
+version = "0.3.4"
 authors = ["Avril <flanchan@cumallover.me>"]
 edition = "2018"
 
@@ -15,3 +15,6 @@ size = ["terminal_size"]
 
 [dependencies]
 terminal_size = {version = "0.1", optional = true}
+[build-dependencies]
+rustc_version = "0.2"
+

build.rs

@@ -0,0 +1,24 @@
+
+extern crate rustc_version;
+use rustc_version::{version, version_meta, Channel};
+
+fn main() {
+    // Assert we haven't travelled back in time
+    assert!(version().unwrap().major >= 1);
+
+    // Set cfg flags depending on release channel
+    match version_meta().unwrap().channel {
+        Channel::Stable => {
+            println!("cargo:rustc-cfg=stable");
+        }
+        Channel::Beta => {
+            println!("cargo:rustc-cfg=beta");
+        }
+        Channel::Nightly => {
+            println!("cargo:rustc-cfg=nightly");
+        }
+        Channel::Dev => {
+            println!("cargo:rustc-cfg=dev");
+        }
+    }
+}

src/inter.rs

@@ -51,3 +51,147 @@ pub trait WithTitle: Sized + Display
     fn complete(self);
 }
 
+impl<T> WithTitle for Box<T>
+where T: WithTitle + ?Sized
+{
+    fn with_title(len: usize, string: impl AsRef<str>) -> Self
+    {
+	Box::new(T::with_title(len, string))
+    }
+    fn update(&mut self)
+    {
+	self.as_mut().update()
+    }
+    fn complete(self)
+    {
+	(*self).complete()
+    }
+}
+
+impl<T> Display for Box<T>
+where T: Display + ?Sized
+{
+    #[inline] fn refresh(&self)
+    {
+	self.as_ref().refresh();
+    }
+    #[inline] fn blank(&self)
+    {
+	self.as_ref().blank();
+    }
+    #[inline] fn println(&self, string: &str)
+    {
+	self.as_ref().println(string);
+    }
+    #[inline] fn eprintln(&self, string: &str)
+    {
+	self.as_ref().eprintln(string);
+    }
+    #[inline] fn get_title(&self) -> &str
+    {
+	self.as_ref().get_title()
+    }
+    #[inline] fn set_title(&mut self, from: &str)
+    {
+	self.as_mut().set_title(from);
+    }
+    #[inline] fn update_dimensions(&mut self, to: usize)
+    {
+	self.as_mut().update_dimensions(to);
+    }
+}
+
+
+impl<T> ProgressBar for Box<T>
+where T: ProgressBar + ?Sized
+{
+    #[inline] fn set_progress(&mut self, value: f64)
+    {
+	self.as_mut().set_progress(value)
+    }
+    #[inline] fn get_progress(&self) -> f64
+    {
+	self.as_ref().get_progress()
+    }
+}
+
+impl<T> Spinner for Box<T>
+where T: Spinner + ?Sized
+{
+    #[inline] fn bump(&mut self)
+    {
+	self.as_mut().bump()
+    }
+}
+
+#[cfg(nightly)] mod never
+{
+    use super::*;
+
+    impl Display for !
+    {
+	#[inline] fn refresh(&self)
+	{
+	    
+	}
+	#[inline] fn blank(&self)
+	{
+
+	}
+	#[inline] fn println(&self, _: &str)
+	{
+	    
+	}
+	#[inline] fn eprintln(&self, _: &str)
+	{
+	    
+	}
+	#[inline] fn get_title(&self) -> &str
+	{
+	    *self
+	}
+	#[inline] fn set_title(&mut self, _: &str)
+	{
+	}
+
+	#[inline] fn update_dimensions(&mut self, _: usize)
+	{
+	    
+	}
+    }
+
+    impl ProgressBar for !
+    {
+	
+	#[inline] fn set_progress(&mut self, _: f64)
+	{
+	    
+	}
+	#[inline] fn get_progress(&self) -> f64
+	{
+	    *self
+	}
+    }
+
+    impl Spinner for !
+    {
+	#[inline] fn bump(&mut self){}
+    }
+
+    impl WithTitle for !
+    {
+	#[inline] fn with_title(_: usize, _: impl AsRef<str>) -> Self
+	{
+	    unreachable!()
+	}
+	#[inline] fn update(&mut self)
+	{
+	    
+	}
+	#[inline] fn complete(self)
+	{
+	    
+	}
+    }
+}
+#[cfg(nightly)] pub use never::*;

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(nightly, feature(never_type))] 
+
 #![allow(dead_code)]
 
 macro_rules! flush {

src/silent.rs

@@ -40,3 +40,280 @@ impl WithTitle for Silent
     #[inline] fn complete(self) {}
 }
 
+/// An enum wrapper for a progress bar or spinner that might be silent.
+#[derive(Debug)]
+pub enum MaybeSilent<T>
+{
+    /// There is no progress
+    Silent,
+    /// There is progress
+    Loud(T),
+}
+
+impl<T> Display for MaybeSilent<T>
+where T: Display
+{
+    
+    fn refresh(&self)
+    {
+	if let Self::Loud(this) = self {
+	    this.refresh();
+	}
+    }
+    fn blank(&self)
+    {
+	
+	if let Self::Loud(this) = self {
+	    this.blank();
+	}
+    }
+    fn println(&self, string: &str)
+    {	
+	if let Self::Loud(this) = self {
+	    this.println(string);
+	}
+    }
+    fn eprintln(&self, string: &str)
+    {
+	if let Self::Loud(this) = self {
+	    this.eprintln(string)
+	}
+    }
+
+    fn get_title(&self) -> &str
+    {
+	if let Self::Loud(this) = self {
+	    this.get_title()
+	} else {
+	    ""
+	}
+    }
+    fn set_title(&mut self, from: &str)
+    {
+	if let Self::Loud(this) = self {
+	    this.set_title(from);
+	}
+    }
+
+    fn update_dimensions(&mut self, to: usize)
+    {
+	if let Self::Loud(this) = self {
+	    this.update_dimensions(to)
+	}
+    }
+}
+
+
+impl<T> ProgressBar for MaybeSilent<T>
+    where T: ProgressBar
+{
+    fn set_progress(&mut self, value: f64)
+    {
+	if let Self::Loud(this) = self {
+	    this.set_progress(value)
+	}
+    }
+    fn get_progress(&self) -> f64
+    {
+	if let Self::Loud(this) = self {
+	    this.get_progress()
+	} else {
+	    0.0
+	}
+    }
+}
+
+impl<T> Spinner for MaybeSilent<T>
+    where T: Spinner
+{
+    fn bump(&mut self)
+    {
+	if let Self::Loud(this) = self {
+	    this.bump()
+	}
+    }
+}
+
+/// A trait for creating a progress bar or spinner with a title.
+impl<T> WithTitle for MaybeSilent<T>
+    where T: WithTitle
+{
+    fn with_title(len: usize, string: impl AsRef<str>) -> Self
+    {
+	Self::Loud(T::with_title(len, string))
+    }
+    fn update(&mut self)
+    {
+	if let Self::Loud(this) = self {
+	    this.update()
+	}
+    }
+    fn complete(self)
+    {
+	if let Self::Loud(this) = self {
+	    this.complete()
+	}
+    }
+}
+
+impl<T> From<Option<T>> for MaybeSilent<T>
+{
+    #[inline] fn from(from: Option<T>) -> Self
+    {
+	match from {
+	    Some(from) => Self::Loud(from),
+	    None => Self::Silent,
+	}
+    }
+}
+
+impl<T> From<MaybeSilent<T>> for Option<T>
+{
+    fn from(from: MaybeSilent<T>) -> Self
+    {
+	match from {
+	    MaybeSilent::Loud(loud) => Some(loud),
+	    _ => None,
+	}
+    }
+}
+
+/// Return a `MaybeSilent` that is always silent
+#[cfg(nightly)]
+pub const fn always() -> MaybeSilent<!>
+{
+    MaybeSilent::Silent
+}
+
+/// Return a `MaybeSilent` that is always silent
+#[cfg(not(nightly))]
+pub const fn always() -> MaybeSilent<Silent>
+{
+    MaybeSilent::Silent
+}
+
+impl<T> MaybeSilent<T>
+{
+    /// Is this the not silent variant?
+    #[inline] pub fn is_loud(&self) -> bool
+    {
+	!self.is_silent()
+    }
+    /// Is this the silent variant?
+    #[inline] pub fn is_silent(&self) -> bool
+    {
+	if let Self::Silent = self {
+	    true
+	} else {
+	    false
+	}
+    }
+    /// Create a new `MaybeSilent` with a value.
+    pub const fn new_some(value: T) -> Self
+    {
+	Self::Loud(value)
+    }
+
+    /// Create a new `MaybeSilent` with a potential value
+    #[inline] pub fn new<U>(from: U) -> Self
+    where U: Into<Option<T>>
+    {
+	match from.into() {
+	    Some(x) => Self::Loud(x),
+	    _ => Self::Silent,
+	}
+    }
+    
+    /// Get a reference to the inner type if possible
+    pub fn as_ref(&self) -> Option<&T>
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+    /// Get a mutable reference to the inner type if possible
+    pub fn as_mut(&mut self) -> Option<&mut T>
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+
+    
+    /// Get a dynamic mutable reference to the internal value if it is `Display`.
+    pub fn as_display_mut(&mut self) -> Option<&mut (dyn Display + 'static)>
+    where T: Display + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+
+    /// Consume this instance and return the inner value if possible
+    #[inline] pub fn into_inner(self) -> Option<T>
+    {
+	self.into()
+    }
+
+    /// Consume this instance and return silent if it had no value
+    #[inline] pub fn into_silent(self) -> Option<Silent>
+    {
+	match self {
+	    Self::Silent => Some(Silent),
+	    _ => None
+	}
+    }
+    
+    /// Get a dynamic mutable reference to the internal value if it is `ProgressBar`
+    pub fn as_bar_mut(&mut self) -> Option<&mut (dyn ProgressBar + 'static)>
+    where T: ProgressBar + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+    
+    /// Get a dynamic mutable reference to the internal value if it is `Spinner`.
+    pub fn as_spinner_mut(&mut self) -> Option<&mut (dyn Spinner + 'static)>
+    where T: Spinner + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+
+    /// Get a dynamic reference to the internal value if it is `Display`.
+    pub fn as_display(&self) -> Option<&(dyn Display + 'static)>
+    where T: Display + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+    
+    /// Get a dynamic reference to the internal value if it is `ProgressBar`
+    pub fn as_bar(&self) -> Option<&(dyn ProgressBar + 'static)>
+    where T: ProgressBar + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+    
+    /// Get a dynamic reference to the internal value if it is `Spinner`.
+    pub fn as_spinner(&self) -> Option<&(dyn Spinner + 'static)>
+    where T: Spinner + 'static
+    {
+	match self {
+	    Self::Loud(loud) => Some(loud),
+	    _ => None
+	}
+    }
+}