Basic implementation of CLI arguments

1 files changed, 51 insertions, 0 deletions

diff --git a/src/args.rs b/src/args.rs
new file mode 100644
index 0000000..6753664
--- /dev/null
+++ b/src/args.rs
@@ -0,0 +1,51 @@
+use std::env;
+
+pub struct Args {
+    pub directory: String,
+    pub n_sentences: u32,
+    pub unique: bool,
+}
+
+impl Args {
+    pub fn parse() -> Option<Args> {
+        let arg_vec: Vec<String> = env::args().collect();
+        let mut i = 1; //skip first arg (execution path)
+
+        let mut n_sentences = 1;
+        let mut unique = false;
+        let mut opt_directory: Option<String> = None;
+
+        while i < arg_vec.len() {
+            match arg_vec[i].as_str() {
+                "-n" | "--sentences" => {
+                    if i + 1 < arg_vec.len() {
+                        n_sentences = arg_vec[i+1].parse::<u32>().ok()?;
+                    } else {
+                        return None;
+                    }
+                    i += 2;
+                },
+                "--unique" => {
+                    unique = true;
+                    i += 1;
+                },
+                other => {
+                    opt_directory = match opt_directory {
+                        Some(_) => { return None; },
+                        None    => Some(other.to_string()),
+                    };
+                    i += 1;
+                },
+            }
+        }
+
+        let directory = opt_directory?;
+
+        Some(Args {
+            directory,
+            n_sentences,
+            unique,
+        })
+    }
+}
+