also get supported php versions

src/action.js

@@ -3,15 +3,39 @@ const xpath = require('xpath');
 const DOMParser = require('xmldom').DOMParser;
 const fs = require('fs');
 const urlExist = require('url-exist');
+const {HttpClient} = require('@actions/http-client');
+
+const client = new HttpClient('nextcloud-version-matrix')
 
 function versionHashBranch(version) {
     return urlExist(`https://github.com/nextcloud/server/tree/stable${version}`);
 }
 
+async function getBranch(version) {
+    if (await versionHashBranch(version)) {
+        return `stable${version}`;
+    } else {
+        return "master";
+    }
+}
+
 function range(from, to) {
     return [...Array(to - from + 1).keys()].map(i => i + from);
 }
 
+async function getSupportedVersions(branch) {
+    let res = await client.get(`https://raw.githubusercontent.com/nextcloud/server/${branch}/lib/versioncheck.php`);
+    let versionCheckCode = await res.readBody();
+    let min = parseVersionId(versionCheckCode.match(/PHP_VERSION_ID < (\d+)/)[1]);
+    let max = parseVersionId(versionCheckCode.match(/PHP_VERSION_ID >= (\d+)/)[1]);
+    return {min: min, max: max};
+}
+
+function parseVersionId(raw) {
+    let matches = raw.match(/^(\d\d)(\d)/)
+    return parseInt(matches[1], 10) / 10 + parseInt(matches[2], 10) / 10
+}
+
 function onlyUnique(value, index, array) {
     return array.indexOf(value) === index;
 }
@@ -28,17 +52,24 @@ function onlyUnique(value, index, array) {
         console.log(`App supports from ${minVersion} till ${maxVersion}`);
 
         const versions = range(minVersion, maxVersion);
-        core.setOutput("versions", JSON.stringify(versions));
 
-        const branches = await Promise.all(versions.map(async (version) => {
-            if (await versionHashBranch(version)) {
-                return `stable${version}`;
-            } else {
-                return "master";
+        const matrix = await Promise.all(versions.map(async (version) => {
+            const branch = await getBranch(version);
+            const php = await getSupportedVersions(branch);
+            return {
+                "php-versions": php.min.toFixed(1),
+                "server-versions": branch,
             }
         }));
 
+        core.setOutput("versions", JSON.stringify(versions));
+
+        const branches = matrix.map(matrix => matrix["server-versions"]);
+
         core.setOutput("branches", JSON.stringify(branches.filter(onlyUnique)));
+        core.setOutput("matrix", JSON.stringify({
+            include: matrix
+        }));
 
     } catch (error) {
         core.setFailed(error.message);