MXS-1780 Adjust maxctrl output according to console width

Figure out the console width and adjust output accordingly.
In default mode use '\n' as separator (necessary for making the
session query output sensible) and in tsv mode ','.

maxctrl/lib/common.js

@@ -211,14 +211,58 @@ module.exports = function() {
     this.formatResource = function (fields, data) {
         var table = getList()
 
+        var separator
+        var max_length
+
+        if (this.argv.tsv) {
+            separator = ', '
+            max_length = Number.MAX_SAFE_INTEGER
+        } else {
+            separator = '\n'
+            var max_field_length = 0
+            fields.forEach(function (i) {
+                var k = Object.keys(i)[0]
+                if (k.length > max_field_length) {
+                    max_field_length = k.length
+                }
+            })
+            max_field_length += 7 // Borders etc.
+
+            max_length = process.stdout.columns - max_field_length
+            if (max_length < 30) {
+                // Ignore excessively narrow terminals.
+                max_length = 30
+            }
+        }
+
         fields.forEach(function(i) {
             var k = Object.keys(i)[0]
             var path = i[k]
             var v = _.getPath(data, path, '')
 
             if (Array.isArray(v) && typeof(v[0]) != 'object') {
-                v = v.join(', ')
+                if (separator == '\n') {
+                    var s = ''
+                    v.forEach(function (part) {
+                        if (s.length) {
+                            s = s + '\n'
+                        }
+                        if (part.length > max_length) {
+                            part = part.substr(0, max_length - 3);
+                            part = part + '...'
+                        }
+                        s = s + part;
+                    });
+                    v = s;
+                } else {
+                    v = v.join(separator)
+                    if (v.length > max_length) {
+                        v = v.substr(0, max_length - 3);
+                        v = v + '...'
+                    }
+                }
             } else if (typeof(v) == 'object') {
+                // We ignore max_length here.
                 v = JSON.stringify(v, null, 4)
             }