Ajax request to compute diff server side.

WIP.

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/diff.js b/lib/diff.js
new file mode 100644
index 000000000..769a8033b
--- /dev/null
+++ b/lib/diff.js
@@ -0,0 +1,47 @@
+var fs = require('fs');
+var child_process = require('child_process');
+
+function diffHandler(req, res, next) {
+    // console.log("req: "+JSON.stringify(JSON.decycle(req)));
+    // console.log("");
+    // console.log("res: "+JSON.stringify(JSON.decycle(res)));
+    // console.log("");
+    // console.log("next: "+JSON.stringify(JSON.decycle(next)));
+    var before = req.body.before;
+    var after = req.body.after;
+    if (before === undefined) {
+        console.log("Warning : Bad request : wrong \"before\"");
+        //return next(new Error("Bad request : wrong \"before\""));
+    }
+    if (after === undefined) {
+        console.log("Warning : Bad request : wrong \"after\"");
+        //return next(new Error("Bad request : wrong \"after\""));
+    }
+    //console.log("Before: ");
+    //console.log(before);
+    //console.log("After: ");
+    //console.log(after);
+    // TODO : make async the two creation of temp files + call to wdiff
+    var before_temp_file = "/tmp/gcc-explorer-before"
+    fs.writeFileSync(before_temp_file, before);
+
+    var after_temp_file = "/tmp/gcc-explorer-after"
+    fs.writeFileSync(after_temp_file, after);
+
+    var wdiff_exe = "/work1/gdevillers/compiler-explorer/external/wdiff-1.2.2/src/wdiff";
+    var maxSize = 100000;
+    var wdiffResult = child_process.spawnSync(
+        "/work1/gdevillers/compiler-explorer/external/wdiff-1.2.2/src/wdiff", 
+        ["/tmp/gcc-explorer-before", "/tmp/gcc-explorer-after"],
+        {maxBuffer: 100000});
+
+    res.set('Content-Type', 'application/json');
+    //res.end(JSON.stringify(result));
+    res.end(JSON.stringify({
+        computedDiff: wdiffResult.stdout.toString()
+        //computedDiff: "aaa\nbbb[-ccc-]\n[-ddd-]eee\n[-fff-]\nsafe"
+        }));
+}
+module.exports = {
+    diffHandler: diffHandler,
+};