1.Add an option -l for submission command which allows user to retrive recent submission in requried programming language, if no submissino in required language, an error will be printed. If no language is specified, program will retrive retrive most recent accepted submission. 2. change behavior: when user specify a language and there are no accepted submission, program will return the most recent non accepted submission in this language 3. bug-fix: problem state is related to the latest submission regardless which language we use. When user specified a language, the status should be related to the latest submission in this language rather than problem

Author: Jiati Le

lib/commands/submission.js

@@ -30,6 +30,12 @@ var cmd = {
       type:     'boolean',
       default:  false,
       describe: 'Provide extra problem details in submission file'
+    },
+    lang: {
+      alias:    'l',
+      type:     'string',
+      default:  'all',
+      describe: 'Programming language used for previous submission'
     }
   }
 };
@@ -68,21 +74,28 @@ function exportSubmission(argv, problem, cb) {
     if (e) return cb(e);
     if (submissions.length === 0) return cb('no submissions?');
 
-    // find the latest accepted one
-    var submission = _.find(submissions, function(x) {
-      // TODO: select by lang?
+    // get obj list contain required filetype
+    var submissionInTargetType = _.filter(submissions, function(x) {
+      return argv.lang === 'all' || argv.lang === x.lang;
+    });
+    if (submissionInTargetType.length === 0) {
+      return cb("No previous submission in required language.");
+    }
+    var submission = _.find(submissionInTargetType, function(x) {
       return x.status_display === 'Accepted';
     });
 
+    var submissionState = submission === undefined ? 'notac' : 'ac';
+
     // if no accepted, use the latest non-accepted one
-    submission = submission || submissions[0];
+    submission = submission || submissionInTargetType[0];
 
     var filename = sprintf('%s/%d.%s.%s.%s%s',
         argv.outdir,
         problem.id,
         problem.key,
         submission.id,
-        problem.state,
+        submissionState,
         h.langToExt(submission.lang));
 
     // skip the existing cached submissions