4 files changed, 188 insertions, 0 deletions
diff --git a/mingling/src/program/config.rs b/mingling/src/program/config.rs
new file mode 100644
index 0000000..93507e7
--- /dev/null
+++ b/mingling/src/program/config.rs
@@ -0,0 +1,33 @@
+pub struct ProgramStdoutSetting {
+    /// Output error messages
+    pub error_output: bool,
+
+    /// Render results and output
+    pub render_output: bool,
+}
+
+impl Default for ProgramStdoutSetting {
+    fn default() -> Self {
+        ProgramStdoutSetting {
+            error_output: true,
+            render_output: true,
+        }
+    }
+}
+
+pub struct ProgramUserContext {
+    /// View help information instead of running the command
+    pub help: bool,
+
+    /// Skip user confirmation step
+    pub confirm: bool,
+}
+
+impl Default for ProgramUserContext {
+    fn default() -> Self {
+        ProgramUserContext {
+            help: false,
+            confirm: false,
+        }
+    }
+}
diff --git a/mingling/src/program/flag.rs b/mingling/src/program/flag.rs
new file mode 100644
index 0000000..0178ebe
--- /dev/null
+++ b/mingling/src/program/flag.rs
@@ -0,0 +1,115 @@
+use crate::Program;
+
+pub struct Flag {
+    vec: Vec<&'static str>,
+}
+
+impl From<&'static str> for Flag {
+    fn from(s: &'static str) -> Self {
+        Flag { vec: vec![s] }
+    }
+}
+
+impl From<&'static [&'static str]> for Flag {
+    fn from(slice: &'static [&'static str]) -> Self {
+        Flag {
+            vec: slice.to_vec(),
+        }
+    }
+}
+
+impl<const N: usize> From<[&'static str; N]> for Flag {
+    fn from(slice: [&'static str; N]) -> Self {
+        Flag {
+            vec: slice.to_vec(),
+        }
+    }
+}
+
+impl<const N: usize> From<&'static [&'static str; N]> for Flag {
+    fn from(slice: &'static [&'static str; N]) -> Self {
+        Flag {
+            vec: slice.to_vec(),
+        }
+    }
+}
+
+impl AsRef<[&'static str]> for Flag {
+    fn as_ref(&self) -> &[&'static str] {
+        &self.vec
+    }
+}
+
+impl std::ops::Deref for Flag {
+    type Target = [&'static str];
+
+    fn deref(&self) -> &Self::Target {
+        &self.vec
+    }
+}
+
+macro_rules! special_flag {
+    ($args:expr, $flag:expr) => {{
+        let flag = $flag;
+        let found = $args.iter().any(|arg| arg == flag);
+        $args.retain(|arg| arg != flag);
+        found
+    }};
+}
+
+macro_rules! special_argument {
+    ($args:expr, $flag:expr) => {{
+        let flag = $flag;
+        let mut value: Option<String> = None;
+        let mut i = 0;
+        while i < $args.len() {
+            if &$args[i] == flag {
+                if i + 1 < $args.len() {
+                    value = Some($args[i + 1].clone());
+                    $args.remove(i + 1);
+                    $args.remove(i);
+                } else {
+                    value = None;
+                    $args.remove(i);
+                }
+                break;
+            }
+            i += 1;
+        }
+        value
+    }};
+}
+
+impl Program {
+    /// Registers a global argument (with value) and its handler.
+    pub fn global_argument<F, A>(&mut self, arguments: A, do_fn: F)
+    where
+        F: Fn(&mut Program, String),
+        A: Into<Flag>,
+    {
+        let flag = arguments.into();
+        for argument in flag.iter() {
+            let value = special_argument!(self.args, argument);
+            if let Some(value) = value {
+                do_fn(self, value);
+                return;
+            }
+        }
+    }
+
+    /// Registers a global flag (boolean) and its handler.
+    pub fn global_flag<F, A>(&mut self, flag: A, do_fn: F)
+    where
+        F: Fn(&mut Program),
+        A: Into<Flag>,
+    {
+        let flag = flag.into();
+        for argument in flag.iter() {
+            let enabled = special_flag!(self.args, argument);
+            if enabled {
+                do_fn(self);
+                return;
+            }
+        }
+    }
+}
diff --git a/mingling/src/program/setup.rs b/mingling/src/program/setup.rs
new file mode 100644
index 0000000..fdf7b04
--- /dev/null
+++ b/mingling/src/program/setup.rs
@@ -0,0 +1,15 @@
+use crate::program::Program;
+
+mod basic;
+pub use basic::*;
+
+pub trait ProgramSetup {
+    fn setup(program: &mut Program);
+}
+
+impl Program {
+    /// Load and execute init logic
+    pub fn with_setup<S: ProgramSetup + 'static>(&mut self, _setup: S) {
+        S::setup(self);
+    }
+}
diff --git a/mingling/src/program/setup/basic.rs b/mingling/src/program/setup/basic.rs
new file mode 100644
index 0000000..0ea72a6
--- /dev/null
+++ b/mingling/src/program/setup/basic.rs
@@ -0,0 +1,25 @@
+use crate::program::{Program, setup::ProgramSetup};
+
+/// Performs basic program initialization:
+///
+/// - Collects `--quiet` flag to control message rendering
+/// - Collects `--help` flag to enable help mode
+/// - Collects `--confirm` flag to skip user confirmation
+pub struct BasicProgramSetup;
+
+impl ProgramSetup for BasicProgramSetup {
+    fn setup(program: &mut Program) {
+        program.global_flag(["--quiet", "-q"], |p| {
+            p.stdout_setting.render_output = false;
+            p.stdout_setting.error_output = false;
+        });
+
+        program.global_flag(["--help", "-h"], |p| {
+            p.user_context.help = true;
+        });
+
+        program.global_flag(["--confirm", "-C"], |p| {
+            p.user_context.confirm = true;
+        });
+    }
+}