vscode snippet

https://code.visualstudio.com/updates/v1_20#_global-snippets

Global snippets

VS Code now supports global snippets meaning snippets that aren't scoped to a single language but can target any kind of files. Using the Preferences: Configure User Snippets command, select the New Global Snippets file... option which will open a .code-snippets file for new snippets. Use the scope attribute to list the languages that are targeted by a snippet. For instance, the snippet below can add a copyright header for JavaScript and TypeScript files:

Variables

With $name or ${name:default} you can insert the value of a variable. When a variable isn’t set, its default or the empty string is inserted. When a variable is unknown (that is, its name isn’t defined) the name of the variable is inserted and it is transformed into a placeholder.

The following variables can be used:

TM_SELECTED_TEXT The currently selected text or the empty string
TM_CURRENT_LINE The contents of the current line
TM_CURRENT_WORD The contents of the word under cursor or the empty string
TM_LINE_INDEX The zero-index based line number
TM_LINE_NUMBER The one-index based line number
TM_FILENAME The filename of the current document
TM_FILENAME_BASE The filename of the current document without its extensions
TM_DIRECTORY The directory of the current document
TM_FILEPATH The full file path of the current document
CLIPBOARD The contents of your clipboard

For inserting the current date and time:

CURRENT_YEAR The current year
CURRENT_YEAR_SHORT The current year's last two digits
CURRENT_MONTH The month as two digits (example '02')
CURRENT_MONTH_NAME The full name of the month (example 'July')
CURRENT_MONTH_NAME_SHORT The short name of the month (example 'Jul')
CURRENT_DATE The day of the month
CURRENT_DAY_NAME The name of day (example 'Monday')
CURRENT_DAY_NAME_SHORT The short name of the day (example 'Mon')
CURRENT_HOUR The current hour in 24-hour clock format
CURRENT_MINUTE The current minute
CURRENT_SECOND The current second

Variable transforms

Transformations allow you to modify the value of a variable before it is inserted. The definition of a transformation consists of three parts:

A regular expression that is matched against the value of a variable, or the empty string when the variable cannot be resolved.
A "format string" that allows to reference matching groups from the regular expression. The format string allows for conditional inserts and simple modifications.
Options that are passed to the regular expression.

The following example inserts the name of the current file without its ending, so from foo.txt it makes foo.

${TM_FILENAME/(.*)\..+$/$1/}
  |           |         | |
  |           |         | |-> no options
  |           |         |
  |           |         |-> references the contents of the first
  |           |             capture group
  |           |
  |           |-> regex to capture everything before
  |               the final `.suffix`
  |
  |-> resolves to the filename

Assign keybindings to snippets

You can create custom keybindings to insert specific snippets. Open keybindings.json (Preferences: Open Keyboard Shortcuts File), which defines all your keybindings, and add a keybinding passing "snippet" as an extra argument:

{
  "key": "cmd+k 1",
  "command": "editor.action.insertSnippet",
  "when": "editorTextFocus",
  "args": {
    "snippet": "console.log($1)$0"
  }
}

The keybinding will invoke the Insert Snippet command but instead of prompting you to select a snippet, it will insert the provided snippet. You define the custom keybinding as usual with a keyboard shortcut, command id, and optional when clause context for when the keyboard shortcut is enabled.

Also, instead of using the snippet argument value to define your snippet inline, you can reference an existing snippet by using the langId and name arguments :

{
  "key": "cmd+k 1",
  "command": "editor.action.insertSnippet",
  "when": "editorTextFocus",
  "args": {
    "langId": "csharp",
    "name": "myFavSnippet"
  }
}