add point finder from args

src/response.rs

@@ -1,6 +1,6 @@
 use std::fmt::{Debug, Display};
 
-use anyhow::Result;
+use anyhow::{Context, Result};
 use chrono::{DateTime, Local, TimeZone, Utc};
 use serde::{de, Deserialize, Deserializer};
 
@@ -72,3 +72,51 @@ pub fn format_departures(response: Response) -> String {
     let departures: Vec<String> = response.departures.iter().map(|d| d.to_string()).collect();
     departures.join("\n\n")
 }
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+pub struct PointFinderResponse {
+    #[serde(deserialize_with = "deserialize_points", rename = "Points")]
+    pub point: Point,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+pub struct Point {
+    pub stopid: String,
+    pub name: String,
+    pub area: Option<String>,
+}
+
+impl From<(&str, &str, Option<&str>)> for Point {
+    fn from(value: (&str, &str, Option<&str>)) -> Self {
+        Self {
+            stopid: value.0.into(),
+            name: value.1.into(),
+            area: value.2.map(|s| s.into()),
+        }
+    }
+}
+
+/// Deserialize a Point Response in the form of
+/// '\"33000742|||Helmholtzstraße|5655904|4621157|0||\"'
+fn extract_data_from_response(line: &str) -> Result<Point> {
+    let mut iter = line.trim_start_matches("\\\"").split_terminator('|');
+
+    let stopid = iter.next().context("getting stopid from line")?;
+    let area = iter.nth(1).context("getting area from line").ok();
+    let name = iter.next().context("getting stop name from line")?;
+    Ok((stopid, name, area).into())
+}
+
+fn deserialize_points<'de, D>(deserializer: D) -> Result<Point, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let stops: Vec<String> = Vec::deserialize(deserializer)?;
+    let first_stop_line = stops
+        .first()
+        .ok_or_else(|| de::Error::custom("could not get first stop"))?;
+    let point = extract_data_from_response(first_stop_line).map_err(de::Error::custom)?;
+    Ok(point)
+}