cf: provide file download page for manual ones (#331)

Author: itzg

src/main/java/me/itzg/helpers/curseforge/InstallCurseForgeCommand.java

@@ -19,6 +19,7 @@
 import me.itzg.helpers.http.PathOrUriConverter;
 import me.itzg.helpers.http.SharedFetchArgs;
 import me.itzg.helpers.json.ObjectMappers;
+import org.jetbrains.annotations.NotNull;
 import picocli.CommandLine.ArgGroup;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.ExitCode;
@@ -208,15 +209,7 @@ public Integer call() throws Exception {
             return ExitCode.OK;
         } catch (MissingModsException e) {
 
-            final TabularOutput tabOut = new TabularOutput('=', "  ", "Mod", "Slug", "Filename", "Download page");
-            for (PathWithInfo info : e.getNeedsDownload()) {
-                tabOut.addRow(
-                    info.getModInfo().getName(),
-                    info.getModInfo().getSlug(),
-                    info.getCurseForgeFile().getDisplayName(),
-                    info.getModInfo().getLinks().getWebsiteUrl()
-                );
-            }
+            final TabularOutput tabOut = buildTabularOutput(e);
 
             if (needsDownloadFile != null) {
                 try (BufferedWriter writer = Files.newBufferedWriter(needsDownloadFile)) {
@@ -240,6 +233,21 @@ public Integer call() throws Exception {
 
     }
 
+    @NotNull
+    private static TabularOutput buildTabularOutput(MissingModsException e) {
+        final TabularOutput tabOut = new TabularOutput('=', "  ",
+            "Mod", "Filename", "Download page"
+        );
+        for (PathWithInfo info : e.getNeedsDownload()) {
+            tabOut.addRow(
+                info.getModInfo().getName(),
+                info.getCurseForgeFile().getDisplayName(),
+                info.getModInfo().getLinks().getWebsiteUrl() + "/files/" + info.getCurseForgeFile().getId()
+            );
+        }
+        return tabOut;
+    }
+
     private ExcludeIncludesContent loadExcludeIncludes() throws IOException {
         final ExcludeIncludesContent fromFile =
             excludeIncludeArgs.excludeIncludeFile != null ? loadExcludeIncludesFile()

src/main/java/me/itzg/helpers/http/package-info.java

@@ -0,0 +1,18 @@
+/**
+ * This package provides wrappers of <a href="https://projectreactor.io/docs/netty/release/reference/index.html">Reactor Netty</a>
+ * to simplify common retrieval patterns such as
+ * <ul>
+ *     <li>parsing response JSON into Java objects</li>
+ *     <li>retrieving a file into a known output name with handling of up to date checks</li>
+ *     <li>retrieving a file without prior knowledge of the resulting filename</li>
+ * </ul>
+ * Examples:
+ * <pre>{@code
+ * Fetch.fetch(URI.create(...))
+ *   .toDirectory(dest)
+ *   .skipUpToDate(true)
+ *   .assemble()
+ *   .block()
+ * }</pre>
+ */
+package me.itzg.helpers.http;