feat: add external vcard-cli

__external/vcard-qr/src/vcard.rs

@@ -0,0 +1,45 @@
+const VCARD_HEADER: &str = "BEGIN:VCARD\nVERSION:4.0\n";
+const VCARD_FOOTER: &str = "END:VCARD";
+
+pub struct VCard {
+    buf: String,
+}
+
+impl VCard {
+    pub fn new() -> Self {
+        VCard {
+            buf: VCARD_HEADER.into(),
+        }
+    }
+
+    pub fn push<P, V>(&mut self, property: P, value: V)
+    where
+        P: AsRef<str>,
+        V: AsRef<str>,
+    {
+        self.buf
+            .push_str(&format!("{}:{}\n", property.as_ref(), value.as_ref()))
+    }
+
+    pub fn optional_push<P, V>(&mut self, property: P, value: V)
+    where
+        P: AsRef<str>,
+        V: AsRef<str>,
+    {
+        if !value.as_ref().is_empty() {
+            self.push(property, value)
+        }
+    }
+
+    pub fn push_explicit<T>(&mut self, data: T)
+    where
+        T: AsRef<str>,
+    {
+        self.buf.push_str(&format!("{}\n", data.as_ref()))
+    }
+
+    pub fn finalize(mut self) -> String {
+        self.push_explicit(VCARD_FOOTER);
+        self.buf.trim().to_owned()
+    }
+}