finish producing the osm change

docs/development.md

@@ -82,3 +82,12 @@ ffmpeg -f x11grab -r 25 -s 1800x800 -i :0.0+28,92 -vcodec huffyuv raw.avi
 
 ffmpeg -ss 10.0 -t 5.0 -i raw.avi -f gif -filter_complex "[0:v] fps=12,scale=1024:-1,split [a][b];[a] palettegen [p];[b][p] paletteuse" screencast.gif
 ```
+
+## JOSM
+
+```
+java -jar ~/Downloads/josm-tested.jar ~/abstreet/map_editor/parking_diff.osc
+```
+
+Press (and release T), then click to pan. Download a relevant layer, select the
+.osc, merge, then upload.

map_editor/src/upstream.rs

@@ -1,6 +1,8 @@
 use map_model::osm;
 use map_model::raw::RawMap;
 use std::collections::BTreeMap;
+use std::fs::File;
+use std::io::Write;
 
 pub fn find_parking_diffs(map: &RawMap) {
     let mut way_to_tags: BTreeMap<String, BTreeMap<String, String>> = BTreeMap::new();
@@ -18,12 +20,8 @@ pub fn find_parking_diffs(map: &RawMap) {
         way_to_tags.insert(tags[osm::OSM_WAY_ID].clone(), tags);
     }
 
-    for (way, tags) in way_to_tags {
-        println!("grab way {}", way);
-        for (k, v) in tags {
-            println!("  - {} = {}", k, v);
-        }
-
+    let mut modified_ways = Vec::new();
+    for (way, abst_tags) in way_to_tags {
         let url = format!("https://api.openstreetmap.org/api/0.6/way/{}", way);
         println!("Fetching {}", url);
         let resp = reqwest::get(&url).unwrap().text().unwrap();
@@ -31,26 +29,64 @@ pub fn find_parking_diffs(map: &RawMap) {
             .unwrap()
             .take_child("way")
             .unwrap();
-        for elem in &tree.children {
+        let mut osm_tags = BTreeMap::new();
+        let mut other_children = Vec::new();
+        for elem in tree.children.drain(..) {
             if elem.name == "tag" {
-                println!(
-                    "attribs: {} = {}",
-                    elem.attributes["k"], elem.attributes["v"]
-                );
+                osm_tags.insert(elem.attributes["k"].clone(), elem.attributes["v"].clone());
+            } else {
+                other_children.push(elem);
             }
         }
+
+        // Does the data already match?
+        if abst_tags.get(osm::PARKING_LEFT) == osm_tags.get(osm::PARKING_LEFT)
+            && abst_tags.get(osm::PARKING_RIGHT) == osm_tags.get(osm::PARKING_RIGHT)
+            && abst_tags.get(osm::PARKING_BOTH) == osm_tags.get(osm::PARKING_BOTH)
+        {
+            println!("{} is already up-to-date in OSM", way);
+            continue;
+        }
+
+        // Fill out these tags.
+        for tag_key in vec![osm::PARKING_LEFT, osm::PARKING_RIGHT, osm::PARKING_BOTH] {
+            if let Some(value) = abst_tags.get(tag_key) {
+                osm_tags.insert(tag_key.to_string(), value.to_string());
+            } else {
+                osm_tags.remove(tag_key);
+            }
+        }
+        tree.children = other_children;
+        for (k, v) in osm_tags {
+            let mut new_elem = xmltree::Element::new("tag");
+            new_elem.attributes.insert("k".to_string(), k);
+            new_elem.attributes.insert("v".to_string(), v);
+            tree.children.push(new_elem);
+        }
+
         tree.attributes.remove("timestamp");
         tree.attributes.remove("changeset");
         tree.attributes.remove("user");
         tree.attributes.remove("uid");
         tree.attributes.remove("visible");
-        // TODO bump version
 
         let mut bytes: Vec<u8> = Vec::new();
         tree.write(&mut bytes).unwrap();
         let out = String::from_utf8(bytes).unwrap();
         let stripped = out.trim_start_matches("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
-
-        println!("wrote: {}", stripped);
+        modified_ways.push(stripped.to_string());
     }
+
+    println!("{} modified ways", modified_ways.len());
+    if modified_ways.is_empty() {
+        return;
+    }
+    let path = "parking_diff.osc";
+    let mut f = File::create(path).unwrap();
+    writeln!(f, "<osmChange version=\"0.6\" generator=\"abst\"><modify>").unwrap();
+    for w in modified_ways {
+        writeln!(f, "  {}", w).unwrap();
+    }
+    writeln!(f, "</modify></osmChange>").unwrap();
+    println!("Wrote {}", path);
 }