Add default cli for grimoire, with args-parsing!

Cargo.lock

@@ -276,6 +276,7 @@ version = "0.0.1"
 dependencies = [
  "anyhow",
  "clap",
+ "derive_more",
  "log",
  "thiserror",
 ]

grimoire_cli/Cargo.toml

@@ -8,8 +8,9 @@ edition.workspace      = true
 authors.workspace      = true
 
 [dependencies]
-anyhow.workspace    = true
-thiserror.workspace = true
-log.workspace       = true
-clap.workspace      = true
+anyhow.workspace      = true
+thiserror.workspace   = true
+log.workspace         = true
+derive_more.workspace = true
+clap.workspace        = true
 

grimoire_cli/src/args/color_choice.rs

+/// The struct to #[command(flatten)] inside the cli's arguments.
+#[derive(clap::Args, Debug, Clone, Copy, Default)]
+#[command(about = None, long_about = None)]
+pub struct ColorChoice {
+    #[arg( long
+         , global          = true
+         , default_value_t = clap::ColorChoice::Auto
+         , value_name      = "WHEN"
+         , value_enum
+    )]
+    /// Chose whever to display using colors or not
+    color: clap::ColorChoice,
+}
+
+impl ColorChoice {
+    pub fn into_inner(self) -> clap::ColorChoice {
+        self.into()
+    }
+}
+
+impl From<ColorChoice> for clap::ColorChoice {
+    fn from(value: ColorChoice) -> Self {
+        value.color
+    }
+}

grimoire_cli/src/args/mod.rs

+pub mod color_choice;
+pub mod verbose;
+
+#[derive(clap::Parser, Debug)]
+pub struct Args {
+    #[command(flatten)]
+    pub verbosity: verbose::VerboseChoice,
+
+    #[command(flatten)]
+    pub color_choice: color_choice::ColorChoice,
+}
+

grimoire_cli/src/args/verbose.rs

+/// The struct to #[command(flatten)] inside the cli's arguments.
+#[derive(clap::Args, Debug, Clone, Copy, Default)]
+#[command( about = None
+         , long_about = None
+         , groups = [clap::ArgGroup::new("verbosity").args(["verbose", "quiet"])]
+)]
+pub struct VerboseChoice {
+    #[arg( long
+         , short  = 'v'
+         , action = clap::ArgAction::Count
+         , global = true
+    )]
+    /// Verbosity level, supply multiple times to increase log level
+    verbose: u8,
+
+    #[arg( long
+         , short  = 'q'
+         , action = clap::ArgAction::SetTrue
+         , global = true
+    )]
+    /// Use to silence any log, only errors will be shown
+    quiet: bool,
+}
+
+impl From<VerboseChoice> for log::Level {
+    fn from(value: VerboseChoice) -> Self {
+        match value {
+            VerboseChoice { quiet: true, .. } => log::Level::Error,
+            VerboseChoice { verbose: 0, .. } => log::Level::Error,
+            VerboseChoice { verbose: 1, .. } => log::Level::Warn,
+            VerboseChoice { verbose: 2, .. } => log::Level::Info,
+            VerboseChoice { verbose: 3, .. } => log::Level::Debug,
+            VerboseChoice { .. } => log::Level::Trace,
+        }
+    }
+}
+
+impl From<VerboseChoice> for log::LevelFilter {
+    fn from(value: VerboseChoice) -> Self {
+        Into::<log::Level>::into(value).to_level_filter()
+    }
+}

grimoire_cli/src/main.rs

+use anyhow::Context as _;
+use clap::Parser as _;
 
-fn main() {}
+mod args;
+
+fn main() -> anyhow::Result<()> {
+    let args = args::Args::try_parse().context("failed to parse arguments")?;
+    println!("{args:?}");
+
+    let _: log::Level = args.verbosity.into();
+    let _ = args.color_choice.into_inner();
+
+    Ok(())
+}