Tuesday, April 19, 2016

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Features Editing Evolved

Visual Studio Code features a battle-tested code editor that has most of the industry standard features, but also has some delights. We've been using it to build VS Code and we hope you'll love it too. This topic will walk you through some of the notable features of the code editor.

Bracket matching

Matching brackets will be highlighted as soon as the cursor is near one of them. The right bracket will always be found, regardless of embedded languages.
Bracket Matching
Tip: You can jump to the matching bracket with kb(editor.action.jumpToBracket)

Selection & Multi-cursor

VS Code has support for multiple cursors. You can add secondary cursors (rendered thinner) with kbstyle(Alt+Click). Each cursor operates independently based on the context it sits in. The most common way to add more cursors is withkb(editor.action.insertCursorBelow) or kb(editor.action.insertCursorAbove) that insert cursors below or above.
Note: Your graphics card provider might overwrite these default shortcuts.
Multi-cursor
kb(editor.action.addSelectionToNextFindMatch) selects the word at the cursor, or the next occurrence of the current selection. kb(editor.action.moveSelectionToNextFindMatch) moves the last added cursor to next occurrence of the current selection.
Multi-cursor-next-word
Tip: You can add more cursors also with kb(editor.action.selectHighlights), which will add a selection at each occurrence of the current selected text or with kb(editor.action.changeAll), which will add a selection at each occurrence of the current word.

Column text selection

Hold kbstyle(Shift) and kbstyle(Alt) while dragging to do column text selection:
Column text selection
There are also default key bindings for column selection on OS X and Windows, but not on Linux. You can edit yourkeybindings.json to bind them to something more familiar if you wish.
For example:
{ "key": "shift+alt+down",     "command": "cursorColumnSelectDown",
                                  "when": "editorTextFocus" },
{ "key": "shift+alt+left",     "command": "cursorColumnSelectLeft",
                                  "when": "editorTextFocus" },
{ "key": "shift+alt+pagedown", "command": "cursorColumnSelectPageDown",
                                  "when": "editorTextFocus" },
{ "key": "shift+alt+pageup",   "command": "cursorColumnSelectPageUp",
                                  "when": "editorTextFocus" },
{ "key": "shift+alt+right",    "command": "cursorColumnSelectRight",
                                  "when": "editorTextFocus" },
{ "key": "shift+alt+up",       "command": "cursorColumnSelectUp",
                                  "when": "editorTextFocus" }

Shrink/expand selection

Quickly shrink or expand the current selection (applies to all languages). Trigger it withkb(editor.action.smartSelect.shrink) and kb(editor.action.smartSelect.grow)
Here's an example of expanding the selection with kb(editor.action.smartSelect.grow):
Expand selection

IntelliSense

We'll always offer word completion, but for the rich languages, such as JavaScript, JSON, HTML, CSS, Less, Sass, C# and TypeScript, we offer a true IntelliSense experience. If a language service knows possible completions, the IntelliSense suggestions will pop up as you type (we call it affectionately 24x7 IntelliSense). You can always manually trigger it withkb(editor.action.triggerSuggest). Out of the box, kbstyle(.)kbstyle(Tab) or kbstyle(Enter) are accept triggers but you can also customize these key bindings.
IntelliSense
Tip: The suggestions filtering supports CamelCase so you can type the upper case letters of a method name to limit the suggestions. For example, "wl" will quickly bring up WriteLine.
Tip: The 24x7 IntelliSense can be configured via the editor.quickSuggestions and editor.suggestOnTriggerCharacterssettings.

Parameter Hints

In JavaScript, TypeScript or C#, parameter hints will pop up as you're typing a method invocation. You can navigate between different overloads with kbstyle(Up) and kbstyle(Down) and the best overload will be presented based on the arguments you pass in.
Parameter Hints

Snippets and Emmet Abbreviations

We offer built-in snippets across languages as well as support for Emmet abbreviations. You can expand Emmet abbreviations in HTML, Razor, CSS, Less, Sass, XML or Jade with kbstyle(Tab).
Emmet snippets
(See the Emmet cheat sheet for syntax examples.)
You can also define your own snippets: Open User Snippets under File > Preferences and select the language for which the snippets should appear. Find out more about this in the customization section of our docs.

Go to Definition

If a language supports it, you can go to the definition of a symbol by pressing kb(editor.action.goToDeclaration).
If you press kbstyle(Ctrl) and hover over a symbol, a preview of the declaration will appear:
Ctrl Hover
Tip: You can jump to the definition with kbstyle(Ctrl+Click) or open the definition to the side withkbstyle(Ctrl+Alt+Click). If you opened a new editor window, you can go back to the previous editor withkb(workbench.action.focusLeftEditor).

Goto Symbol

You can navigate symbols inside a file with kb(workbench.action.gotoSymbol). By typing kbstyle(:) the symbols will be grouped by category. Just press kbstyle(Up) or kbstyle(Down) and navigate to the place you want.
Go to Symbol

Open symbol by name

In C# and in TypeScript, you can jump to a symbol across files with kb(workbench.action.showAllSymbols). Just type the first letter of a type you want to navigate to, regardless of which file contains it, and press kbstyle(Enter).
Open symbol by name

Folding

You can fold regions of source code using the folding icons on the gutter between line numbers and line start. Move the mouse over the gutter to fold and unfold regions. The folding regions are evaluated based on the indentation of lines. A folding region starts when a line has a smaller indent than one or more following lines, and ends when there is a line with the same or smaller indent.
You can also use the following actions:
  • Fold (kb(editor.fold)) folds the innermost uncollapsed region at the cursor
  • Unfold (kb(editor.unfold)) unfolds the collapsed region at the cursor
  • Fold All (kb(editor.foldAll)) folds all region in the editor
  • Unfold All (kb(editor.unfoldAll)) unfolds all regions in the editor
  • Fold Level X (kb(editor.foldLevel2) for level 2) folds all regions of level X, except the region at the current cursor position
Folding

Gutter indicators

If you open a folder that is a Git repository and begin making changes, VS Code will add useful annotations to the gutter and to the overview ruler.
  • A red triangle indicates where lines have been deleted
  • A green bar indicates new added lines
  • A blue bar indicates modified lines
Gutter indicators

Peek

We think there's nothing worse than a big context switch when all you want is to quickly check something. That's why we support peeked editors. When you execute a Reference Search (via kb(editor.action.referenceSearch.trigger)), or a Peek Definition (via kb(editor.action.previewDeclaration)), we embed the result inline:
Find References
Tip: You can navigate between different references in the peeked editor and, if you need to, you can even make quick edits right there!
Tip: Clicking on the peeked editor filename or double-clicking in the result list will open the reference in the outer editor.

Hover

For languages that support it, the hover will show useful information, such as types of symbols, or, in the case of CSS below, the shape of the HTML that would match a certain CSS rule:
Hover

Reference information

C# supports inline reference information, that is live updated. This allows you to quickly analyze the impact of your edit or the popularity of your specific method or property throughout your project:
Reference information
Tip: Directly invoke the Find References action by clicking on these annotations.
Tip: Reference information can be turned on or off through the editor.referenceInfos setting.

Rename symbol

TypeScript and C# support rename symbol across files. Simply press kb(editor.action.rename) and then type the new desired name and press kbstyle(Enter). All usages of the symbol will be renamed, across files.
Rename

Errors & Warnings

Warnings or Errors can be generated either via configured tasks or by the rich language services, that constantly analyze your code in the background. Since we love bug-free code, warnings and errors show up in multiple places:
  • In the status line there is a summary of all errors and warnings counts.
  • You can click on the summary or press kb(workbench.action.showErrorsWarnings) to see a list of all current errors.
  • If you open a file that has errors or warnings, they will be rendered inline with the text and in the overview ruler.
Show Errors and Warnings
Tip: To loop through errors or warnings in the current file, you can press kb(editor.action.marker.next) orkb(editor.action.marker.prev) which will show an inline zone detailing the problem and possible code actions (if available):
Errors and Warnings Inline


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