eh

src/args.rs

@@ -10,6 +10,22 @@ pub fn program_name() -> &'static str
     &NAME[..]
 }
 
+/// Print usage and exit
+pub fn usage() -> !
+{
+    println!(r#"Videl (versioning delete).
+
+Usage: {program} [OPTIONS] <files...>
+Usage: {program} --help
+
+OPTIONS:
+
+Compiled with:
+{features}
+"#, program = program_name(), features = );
+    std::process::exit(0)
+}
+
 #[inline] pub fn parse() -> ReportedResult<config::Config>
 {
     parse_as_args(std::env::args().skip(1))

src/features.rs

@@ -0,0 +1,53 @@
+//! For printing features etc.
+use std::{
+    fmt,
+};
+use cfg_if::cfg_if;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum Enabled
+{
+    On,
+    Off,
+}
+
+trait Feature
+{
+    const DEFAULT: Enabled;
+    const CURRENT: Enabled;
+
+    const fn is_default() -> bool
+    {
+	Self::DEFAULT == Self::CURRENT
+    }
+
+    const fn is_enabled() -> bool
+    {
+	Self::CURRENT == Enabled::On
+    }
+}
+
+#[macro_export] macro_rules! feature {
+    ($name:literal) => {
+	cfg_if!{
+	    if #[cfg(feature=$name)]  {
+		//TODO: create anony type that impl's Feature up threre, and such
+	    } else {
+		
+	    }
+	}
+    }
+}
+
+
+
+#[derive(Debug)]
+pub struct Features;
+
+impl fmt::Display for Features
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	//TODO: print features
+    }
+}

src/main.rs

@@ -20,6 +20,7 @@ use error::{
 use color_eyre::{
     eyre::{
 	self,
+	eyre,
 	Result as ReportedResult,
     },
 };
@@ -31,11 +32,21 @@ mod metadata;
 mod resolve;
 mod database;
 mod config;
+mod features;
 mod args;
 
-async fn begin() -> ReportedResult<i32>
+type Pointer = *const !;
+
+fn install() -> ReportedResult<()>
 {
     color_eyre::install()?;
+
+    Ok(())
+}
+
+async fn begin() -> ReportedResult<i32>
+{
+    install()?;
     
     Ok(0)
 }