Fix detecting the indent of files with many repeats after a single in…

…dent (#34)

fixture/long-repeat.js

@@ -0,0 +1,43 @@
+{
+/* Examine the case of an indent that happens only once
+but then has a long block at that level, as compared to
+an indent that occurs many times.
+   The odd spacing on this line is artificial, but critical to the example. */
+    observation: 'This is literally the only line with a 1-space change',
+    key1: 'dummy',
+    key2: 'dummy',
+    key3: 'dummy',
+    key4: 'dummy',
+    key5: 'dummy',
+    key6: 'dummy',
+    key7: 'dummy',
+    key8: 'dummy',
+    key9: 'dummy',
+    key10: 'dummy',
+    key11: 'dummy',
+    key12: 'dummy',
+    key13: 'dummy',
+    key14: 'dummy',
+    key15: 'dummy',
+    key16: 'dummy',
+    key17: 'dummy',
+    key18: 'dummy',
+    key19: 'dummy',
+    key20: 'dummy',
+    contrast: {
+        idea: 'Now we will have about ten instances with an indent change of 4',
+    },
+    contrast2: {
+        subkey: 'dummy'
+    },
+    contrast3: {
+        subkey: 'dummy'
+    },
+    contrast4: {
+        subkey: 'dummy'
+    },
+    contrast5: {
+        subkey: 'dummy'
+    },
+}
+

index.js

@@ -36,6 +36,7 @@ function makeIndentsMap(string, ignoreSingleSpaces) {
 
 		let indent;
 		let indentType;
+		let use;
 		let weight;
 		let entry;
 		const matches = line.match(INDENT_REGEX);
@@ -58,14 +59,18 @@ function makeIndentsMap(string, ignoreSingleSpaces) {
 
 			previousIndentType = indentType;
 
+			use = 1;
 			weight = 0;
 
 			const indentDifference = indent - previousSize;
 			previousSize = indent;
 
 			// Previous line have same indent?
 			if (indentDifference === 0) {
-				weight++;
+				// Not a new "use" of the current indent:
+				use = 0;
+				// But do add a bit to it for breaking ties:
+				weight = 1;
 				// We use the key from previous loop
 			} else {
 				const absoluteIndentDifference = indentDifference > 0 ? indentDifference : -indentDifference;
@@ -74,7 +79,7 @@ function makeIndentsMap(string, ignoreSingleSpaces) {
 
 			// Update the stats
 			entry = indents.get(key);
-			entry = entry === undefined ? [1, 0] : [++entry[0], entry[1] + weight];
+			entry = entry === undefined ? [1, 0] : [entry[0] + use, entry[1] + weight];
 
 			indents.set(key, entry);
 		}

test.js

@@ -140,3 +140,8 @@ test('return indentations status for indented files with single spaces only', t
 		type: 'space',
 	});
 });
+
+test('detect the indent of a file with many repeats after a single indent', t => {
+	const stats = detectIndent(getFile('fixture/long-repeat.js'));
+	t.is(stats.amount, 4);
+});