Issue #114 handle ctags -n jumping to symbol

symbols-view expects there to be patterns in `tags` files. This is the default behavior when running ctags (you can also explictly set it with the -F, or --excmd=pattern options). When running ctags with the number option (-n or --excmd=number), e.g ctags -R -n, numbers are used instead of patterns to identify lines.

This package should expect and accept both formats. To determine which format a tag uses, check if tag.pattern and tag.lineNumber represent the same number.  If so create a Point based on line number instead of pattern.  `node-ctags` populates the tag.pattern parameter with the stringified lineNumber if `ctags -n` is run. When a tag has a pattern instead of a lineNumber,  tag.LineNumber defaults to 0, and comparison to parseInt(tag.pattern) (NaN) returns False.

An additional test fixture was added for tags generated using the `ctags -R -n`.

lib/symbols-view.coffee

@@ -100,6 +100,10 @@ class SymbolsView extends SelectListView
     # Remove leading /^ and trailing $/
     pattern = tag.pattern?.replace(/(^^\/\^)|(\$\/$)/g, '').trim()
 
+    # `ctags -excmd=number`, giving line numbers instead of patterns to locate
+    # symbols. The line number is being interpreted as a pattern by node-ctags
+    return new Point(tag.lineNumber - 1, 0) if tag.lineNumber is parseInt(pattern)
+
     return unless pattern
     file = path.join(tag.directory, tag.file)
     return unless fs.isFileSync(file)

spec/fixtures/js-excmd-number/sorry.js

@@ -0,0 +1,11 @@
+function saySorry() {
+  return "I'm sorry";
+}
+
+var isItTooLate = saySorry();
+
+var didIletYouDown = true;
+
+function redeemOhReedeem() {
+  return !didIletYouDown;
+}

spec/fixtures/js-excmd-number/tags

@@ -0,0 +1,9 @@
+!_TAG_FILE_FORMAT	2	/extended format; --format=1 will not append ;" to lines/
+!_TAG_FILE_SORTED	1	/0=unsorted, 1=sorted, 2=foldcase/
+!_TAG_PROGRAM_AUTHOR	Darren Hiebert	/[email protected]/
+!_TAG_PROGRAM_NAME	Exuberant Ctags	//
+!_TAG_PROGRAM_URL	http://ctags.sourceforge.net	/official site/
+!_TAG_PROGRAM_VERSION	5.8	//
+didIletYouDown	sorry.js	7;"	v
+redeemOhReedeem	sorry.js	9;"	f
+saySorry	sorry.js	1;"	f

spec/symbols-view-spec.coffee

@@ -246,6 +246,25 @@ describe "SymbolsView", ->
         expect(atom.workspace.getActiveTextEditor().getPath()).toBe directory.resolve("tagged-duplicate.js")
         expect(atom.workspace.getActiveTextEditor().getCursorBufferPosition()).toEqual [0, 4]
 
+    it "moves the cursor to the declaration if the tags are numbered instead of patterned", ->
+      atom.project.setPaths([temp.mkdirSync("atom-symbols-view-js-excmd-number-")])
+      fs.copySync(path.join(__dirname, "fixtures", "js-excmd-number"), atom.project.getPaths()[0])
+
+      waitsForPromise ->
+        atom.workspace.open "sorry.js"
+
+      runs ->
+        editor = atom.workspace.getActiveTextEditor()
+        editor.setCursorBufferPosition([9, 16])
+        spyOn(SymbolsView.prototype, "moveToPosition").andCallThrough()
+        atom.commands.dispatch(getEditorView(), 'symbols-view:go-to-declaration')
+
+      waitsFor ->
+        SymbolsView::moveToPosition.callCount is 1
+
+      runs ->
+        expect(editor.getCursorBufferPosition()).toEqual [6, 0]
+
     it "includes ? and ! characters in ruby symbols", ->
       atom.project.setPaths([temp.mkdirSync("atom-symbols-view-ruby-")])
       fs.copySync(path.join(__dirname, 'fixtures', 'ruby'), atom.project.getPaths()[0])