Add json output support

source/app/action/index.mjs

@@ -198,7 +198,7 @@
           info.break()
           info.group({metadata, name:"core", inputs:config})
           info("Plugin errors", die ? "(exit with error)" : "(displayed in generated image)")
-          const convert = ["jpeg", "png"].includes(config["config.output"]) ? config["config.output"] : null
+          const convert = ["jpeg", "png", "json"].includes(config["config.output"]) ? config["config.output"] : null
           Object.assign(q, config)
 
         //Base content

source/app/metrics/index.mjs

@@ -53,6 +53,12 @@
               console.warn(util.inspect(errors, {depth:Infinity, maxStringLength:256}))
           }
 
+        //JSON output
+          if (convert === "json") {
+            console.debug(`metrics/compute/${login} > json output`)
+            return {rendered:data, mime:"application/json"}
+          }
+
         //Rendering
           console.debug(`metrics/compute/${login} > render`)
           let rendered = await ejs.render(image, {...data, s:imports.s, f:imports.format, style, fonts}, {views, async:true})

source/app/web/instance.mjs

@@ -189,7 +189,7 @@
                 graphql, rest, plugins, conf,
                 die:q["plugins.errors.fatal"] ?? false,
                 verify:q.verify ?? false,
-                convert:["jpeg", "png"].includes(q["config.output"]) ? q["config.output"] : null,
+                convert:["jpeg", "png", "json"].includes(q["config.output"]) ? q["config.output"] : null,
               }, {Plugins, Templates})
             //Cache
               if ((!debug)&&(cached))

source/plugins/core/README.md

@@ -149,12 +149,15 @@ It is possible to mitigate this issue using `retries` and `retries_delay` option
     retries_delay: 300
 ```
 
-### 💱 Convert output to PNG/JPEG
+### 💱 Convert output to PNG/JPEG or JSON
 
-It is possible to convert output from SVG to PNG or JPEG images by using `config_output` option.
+It is possible to convert output from SVG to PNG or JPEG images and even to JSON by using `config_output` option.
 
 Note that `png` does not support animations while `jpeg` does not support both animations and transparency.
 
+Using `json` output can be useful if you want to retrieve all data computed by metrics without rendering it.
+It could then be processed for other usages.
+
 #### ℹ️ Examples workflows
 
 ```yaml

source/plugins/core/metadata.yml

@@ -150,6 +150,7 @@ inputs:
       - svg
       - png  # Does not support animations
       - jpeg # Does not support animations and transparency
+      - json # Outputs a JSON file instead of an image
 
   # Number of retries in case rendering fail
   retries:

source/plugins/core/tests.yml

@@ -10,6 +10,12 @@
     token: MOCKED_TOKEN
     config_output: png
 
+- name: Image output (json)
+  uses: lowlighter/metrics@latest
+  with:
+    token: MOCKED_TOKEN
+    config_output: json
+
 - name: Use twemoji
   uses: lowlighter/metrics@latest
   with: