Provides a select_all_by_current_scope command, which (as the name suggests) select everything matching the current scope (that is the scope of your first cursor).

The command accepts an optional argument scope_must_match containing a regex string, which filters the long scope string to get a single scope name.

This plugin doesn't have any default keybindings. You have to assign them yourself.

Selects everything matching current scope:

[
  {
    "keys": ["ctrl+alt+shift+a"],
    "command": "select_all_by_current_scope"
  }
]

Selects everything matching the first piece of current scope, which contains the word embedded:

[
  {
    "keys": ["ctrl+alt+shift+a"],
    "command": "select_all_by_current_scope",
    "args": { "scope_must_match": "embedded" }
  }
]

1. Download & Install Sublime Text 3 (https://www.sublimetext.com/3)
2. Go to the menu Tools -> Install Package Control, then, wait few seconds until the installation finishes up
3. Now, Go to the menu Preferences -> Package Control
4. Type Add Channel on the opened quick panel and press Enter
5. Then, input the following address and press Enter

   https://raw.githubusercontent.com/evandrocoan/StudioChannel/master/channel.json
   

6. Go to the menu Tools -> Command Palette... (Ctrl+Shift+P)
7. Type Preferences: Package Control Settings – User on the opened quick panel and press Enter
8. Then, find the following setting on your Package Control.sublime-settings file:

   "channels":
   [
       "https://packagecontrol.io/channel_v3.json",
       "https://raw.githubusercontent.com/evandrocoan/StudioChannel/master/channel.json",
   ],

9. And, change it to the following, i.e., put the https://raw.githubusercontent... line as first:

   "channels":
   [
       "https://raw.githubusercontent.com/evandrocoan/StudioChannel/master/channel.json",
       "https://packagecontrol.io/channel_v3.json",
   ],

   • The https://raw.githubusercontent... line must to be added before the https://packagecontrol.io... one, otherwise, you will not install this forked version of the package, but the original available on the Package Control default channel https://packagecontrol.io...
10. Now, go to the menu Preferences -> Package Control
11. Type Install Package on the opened quick panel and press Enter
12. Then, search for SelectAll and press Enter

See also:

1. ITE - Integrated Toolset Environment
2. Package control docs for details.

Say you have a knitr/Sweave file with embedded R code. You might want to select all the R code. For that, I have the following keybinding:

[
  {
    "keys": ["ctrl+alt+shift+a"],
    "command": "select_all_by_current_scope",
    "args": { "scope_must_match": "embedded" }
    "context": [
      { "key": "selector", "operator": "equal", "operand": "source.r.embedded.knitr" }
    ]
  }
]

How about all the javascript code from an HTML file? Bold text from a Markdown file? That's matched by default:

[
  {
    "keys": ["ctrl+alt+shift+a"],
    "command": "select_all_by_current_scope"
  }
]