Laurent Orseau <firstname.lastname@example.org>
Quickscript’s makes it easy to extend DrRacket with small Racket scripts to automate some actions in the editor, while avoiding the need to restart DrRacket.
Creating a new script is as easy as a click on Scripts | New script…. Each script is automatically added as an item to the Scripts menu, without needing to restart DrRacket. A keyboard shortcut can be assigned to a script (via the menu item). By default, a script takes as input the currently selected text, and outputs the replacement text. There is also direct access to some elements of DrRacket GUI for advanced scripting, like DrRacket’s frame and the definition or interaction editor.
Quickscript is installed automatically with DrRacket, so you don’t need to do anything.
You can use Quickscript on its own, but the Quickscript Extra package has a wide range of useful scripts as well as some example scripts intended for customisation by the user.
or on the command line with
$ racket -l quickscript-extra/register
Then click on Scripts|Manage scripts|Compile scripts and reload. (There is no need to restart DrRacket.)
Click on the Scripts|Manage scripts|New script... menu item, and enter Reverse for the script name. This creates and opens the file reverse.rkt in the user’s scripts directory. Also, a new item automatically appears in the Scripts menu.
Don’t name your script function reverse, it would shadow Racket’s own and make the script hang.
If you later change the #:label property, you will need to reload the menu by clicking on Scripts|Manage scripts|Reload scripts menu after saving the file).
(define-script reverse-selection #:label "Reverse" (λ (selection) (list->string (reverse (string->list selection)))))
Then go to a new tab, type some text, select it, and click on Scripts|Reverse, and voilà!
Quickscript adds a Scripts menu to the main DrRacket window. This menu has several items, followed by the list of scripts.
The New script item asks for a script name and creates a corresponding .rkt file in the user’s script directory, and opens it in DrRacket.
(define-script a-complete-script ; Properties: #:label "Full script" #:help-string "A complete script showing all properties and arguments" #:menu-path ("Submenu" "Subsubmenu") #:shortcut #\a #:shortcut-prefix (ctl shift) #:output-to selection #:persistent #:os-types (unix macosx windows) ; Procedure with its arguments: (λ (selection #:frame fr #:editor ed #:definitions defs #:interactions ints #:file f) "Hello world!"))
Note that the arguments of the properties are literals, not expressions, so they must not be quoted. Below we detail first the procedure and its arguments and then the script’s properties.
(define-script name property ... proc)
property = #:label label-string | #:help-string string | #:menu-path (label-string ...) | #:shortcut char | symbol | #f | #:shortcut-prefix (shortcut-prefix ...) | #:persistent? #t | #f | #:output-to output-to | #:os-types (os-type ...) shortcut-prefix = alt | cmd | meta | ctl | shift | option output-to = selection | new-tab | message-box | clipboard | #f os-type = macosx | unix | windows proc =
(λ (selection-id [#:editor editor-id] [#:definitions definitions-id] [#:interactions interactions-id] [#:frame frame-id] [#:file file-id]) body-expr ... return-expr)
Observe again that the arguments of the properties are literals and not expressions. This is because the script file is read twice for different purposes. The first time, Quickscript reads the script file to extract the minimum information necessary to build the menu items in DrRacket. No Racket operation is performed at this stage so as to be as light and quick as possible. Then, when the corresponding menu item is clicked, Quickscript reads the script file a second time, this time to actually read and visit the Racket module and call the corresponding procedure. That is, the script modules are instantiated only on demand to reduce the loading time and memory footprint.
When clicking on a script label in the Scripts menu in DrRacket, its corresponding procedure is called. The procedure takes at least the selection argument, which is the string that is currently selected in the current editor. The procedure must returns either #f or a string?. If it returns #f, no change is applied to the current editor, but if it returns a string, then the current selection is replace with the return value.
The path to the current file of the definition window, or #f if there is no such file (i.e., unsaved editor).Example:
(define-script current-file-example #:label "Current file example" #:output-to message-box (λ (selection #:file f) (string-append "File: " (if f (path->string f) "no-file") "\nSelection: " selection)))
#:definitions : text%
#:interactions : text%
The text% editor of the current interaction window. Similar to #:definitions.
#:editor : text%
The text% current editor, either the definition or the interaction editor. Similar to #:definitions.
#:frame : drracket:unit:frame<%>
DrRacket’s frame. For advanced scripting.Example:
The properties are mere data and cannot contain expressions.
Most properties (#:label, #:shortcut, #:shortcut-prefix, #:help-string) are the same as for the menu-item% constructor. In particular, a keyboard shortcut can be assigned to an item.
If a property does not appear in the dictionary, it takes its default value.
Note that different scripts in different files can share the same submenus.
If selection, the output of the procedure replaces the selection in the current editor (definitions or interactions), or insert the output at the cursor if there is no selection. If new-tab, the return value is written in a new tab. If message-box, the return value (if a string) is displayed in a message-box. If clipboard, the return value (if a string) is copied to the clipboard. If #f, the return value is not used.
If this value is changed, make sure to reload the menu with Scripts | Manage scripts | Reload menu.
If they keyword #:persistent is not provided, each invocation of the script is done in a fresh namespace.
But if #:persistent is provided, a fresh namespace is created only the first time it is invoked, and the same namespace is re-used for the subsequent invocations. Note that a single namespace is kept per file, so if different scripts in the same file are marked as persistent, they will all share the same namespace (and, thus, variables). Also note that a script marked as non-persistent will not share the same namespace as the other scripts of the same file marked as persistent.Consider the following script:
(define count 0) (define-script persistent-counter #:label "Persistent counter" #:persistent #:output-to message-box (λ (selection) (set! count (+ count 1)) (number->string count)))
If the script is persistent, the counter increases at each invocation of the script via the menu, whereas it always displays 1 if the script is not persistent.
Note: Persistent scripts can be "unloaded" by clicking on the Scripts|Manage scripts|Unload persistent scripts menu item. In the previous example, this will reset the counter. Make sure to unload a persistent script after editing it. Scripts|Manage scripts|Reload menu and Scripts|Manage scripts|Compile scripts and reload also unload persistent scripts.
Technical point: The script’s procedure is called outside of the namespace that was used to dynamic-require it, and inside DrRacket frame’s namespace so as to have access to objects in this frame.
This keyword must be followed by a list of supported os-types. Defaults to all types, i.e. (unix macosx windows).
If changes are made to these properties, the Scripts menu will probably need to be reloaded by clicking on Scripts|Manage scripts|Reload scripts menu.
When the user creates a new script, the latter is placed into a sub-directory of (find-system-path 'pref-dir). A direct access to this folder is provided via the Scripts|Manage scripts|Open script... menu entry.
Additional directories to look for scripts can be added via the Scripts|Manage scripts|Library menu entry. When a directory is added to the library, all its .rkt files (non-recursively) are considered as scripts. Specific files can be excluded from the library.
When a script is installed from a third party package (like quickscript-extra), it comes with its set of own values for its properties. These values may not suit the user who may want to redefine some of them, like the menu path or the keyboard shortcuts. An obvious choice for the user is to copy/paste the entire script, but this would prevent from benefiting from further bug fixes and enhancements made by the writer of the original script.
To solve this problem, the user can instead make a shadow script, which creates a new script in the user’s directory, with its own set of properties that can be changed by the user, but the procedure of this script is bound to that of the original script.
To make a shadow script, open the script library in Scripts|Manage scripts|Library, navigate to the third-party script and click on Shadow.
To update Quickscript once already installed, either do so through the File|Package Manager menu in DrRacket, or run raco pkg update quickscript.
The user’s scripts will not be modified in the process.
The simplest way to distribute a small script s to publish it as a gist or on PasteRack, and share the link. A user can then copy/paste the contents into a new script. Don’t forget to include a permissive license such as MIT/Apache 2.
If the file "register.rkt" is not at the root, the runtime-path needs to be modified accordingly.
#lang racket/base (require (for-syntax racket/base racket/runtime-path (only-in quickscript/library add-third-party-script-directory!))) ;; This file is going to be called during setup and will automatically ;; register the scripts subdirectory in quickscript's library. (begin-for-syntax (define-runtime-path script-dir "scripts") (add-third-party-script-directory! script-dir))
You can see an example with quickscript-extra.
Don’t forget to register your package on the Racket server.
Copyright (c) 2012-2018 by Laurent Orseau <email@example.com>.
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