1 files changed, 70 insertions, 0 deletions
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ba7b145
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,70 @@
+extern crate chrono;
+extern crate docopt;
+extern crate serde;
+
+use std::process::exit;
+
+use chrono::NaiveDate;
+use docopt::Docopt;
+use serde::Deserialize;
+
+mod lib;
+use lib::partition_days;
+
+const USAGE: &'static str = "
+Usage: frotate [-k|-d] [-b <base>] <day>...
+       frotate --help
+
+Options:
+  -k --keep         Print days to keep
+  -d --delete       Print days to delete
+  -b --base <base>  Base of the exponent [default: 1.1]
+  -h --help         Show this help text
+";
+
+#[derive(Deserialize)]
+struct Args {
+    flag_keep: bool,
+    flag_delete: bool,
+    flag_base: f32,
+    arg_day: Vec<NaiveDate>,
+}
+
+fn exponent(b:f32, n:u32) -> i64 {
+    let i : i32 = n as i32 - 1;
+    return b.powi(i).ceil() as i64;
+}
+
+fn main() {
+    let args: Args = Docopt::new(USAGE)
+        .and_then(|d| d.deserialize())
+        .unwrap_or_else(|e| e.exit());
+
+    let parts = partition_days(&|n| exponent(args.flag_base, n), &args.arg_day);
+
+    if args.flag_keep {
+        for days in parts.iter() {
+            match days.front() {
+                Some(d) => print!("{:?} ", d),
+                None => {}
+            }
+        }
+        println!();
+    } else if args.flag_delete {
+        for days in parts.iter() {
+            for d in days.iter().skip(1) {
+                print!("{:?} ", d);
+            }
+        }
+        println!();
+    } else {
+        for days in parts.iter() {
+            for d in days.iter() {
+                eprint!("{:?} ", d);
+            }
+            eprintln!();
+        }
+        exit(1);
+    }
+}
+