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README.md

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+# emoji_gen
+Script for generating `pack.json` file for emoji packs in pleroma/akkoma
+
+## Usage
+If you have LLVM's D compiler (`ldc2`) installed, you can run the script directly:
+```
+./emoji_gen.d <images directory>
+```
+
+Or if you have `dmd`:
+```
+rdmd -run emoji_gen.d <images directory>
+```
+
+It iterates through all image files inside the directory, not recursively. Check `permittedExtensions` variable for file extensions to include, default value: `jpg jpeg gif png`. At the end, it generates `pack.json` in the same directory as the images.

emoji_gen.d

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+#!/usr/bin/env -S ldc2 -run
+
+/**
+ * @file emoji_gen.d
+ * @author marisa (marisa@fwmari.net)
+ * @brief Main program for generating emoji pack metadata
+ * @version 0.1
+ * @date 2023-11-26
+ *
+ * Copyright (c) 2024 Marisa
+ *
+ */
+
+module emoji_gen;
+
+import std.stdio;
+import std.file;
+import std.path;
+import std.json;
+import std.algorithm.searching;
+
+enum permittedExtensions = "jpg jpeg gif png";
+
+int main(string[] args) {
+    if (args.length < 2) {
+        writeln("Usage: ", args[0], " <directory>");
+        return 1;
+    }
+
+    string dirPath = args[1];
+    assert(exists(dirPath));
+    assert(isDir(dirPath));
+
+    string outFile = buildPath(dirPath, "pack.json");
+
+    string[string] files;
+
+    foreach (entry; dirEntries(dirPath, SpanMode.shallow)) {
+        string name = baseName(entry.name);
+
+        if (!entry.isFile)
+            continue;
+
+        if (!permittedExtensions.canFind(extension(name)[1 .. $])) {
+            writeln("Not including ", name, " as it isn't a permitted file");
+            continue;
+        }
+
+        writefln("Adding :%s: -> %s", stripExtension(name), name);
+        files[name.stripExtension] = name;
+    }
+
+    if (files.length <= 0) {
+        writeln("No images found, not creating pack");
+        return 1;
+    }
+
+    JSONValue pack;
+    pack["pack"] = ["can-download": false];
+    pack["files"] = files;
+    pack["files_count"] = files.length;
+
+    writeln("Found ", files.length, " images");
+    writeln("Writing pack information to ", outFile);
+    File(outFile, "w").write(pack.toPrettyString());
+    // write(outFile, pack.toPrettyString().ptr);
+
+    return 0;
+}