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link to docstring ref; fix other links, formatting
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@ -11,7 +11,7 @@
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You can use YASnippet to expand snippets in different ways:
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- When =yas-minor-mode= is active:
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- When [[sym:yas-minor-mode][=yas-minor-mode=]] is active:
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- Type the snippet's *trigger key* then calling [[sym:yas-expand][=yas-expand=]]
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(bound to =TAB= by default).
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@ -31,10 +31,10 @@
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*** Trigger key
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=yas-expand= tries to expand a /snippet abbrev/ (also known as
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[[sym:yas-expand][=yas-expand=]] tries to expand a /snippet abbrev/ (also known as
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/snippet key/) before point.
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When =yas-minor-mode= is enabled, it binds [[sym:yas-expand][=yas-expand=]] to =TAB= and
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When [[sym:yas-minor-mode][=yas-minor-mode=]] is enabled, it binds [[sym:yas-expand][=yas-expand=]] to =TAB= and
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=<tab>= by default, however, you can freely set it to some other key:
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#+begin_src emacs-lisp :exports code
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@ -46,26 +46,26 @@ When =yas-minor-mode= is enabled, it binds [[sym:yas-expand][=yas-expand=]] to =
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[[./images/minor-mode-indicator.png]]
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To enable the YASnippet minor mode in all buffers globally use the
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command =yas-global-mode=.
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command [[sym:yas-global-mode][=yas-global-mode=]].
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When you use =yas-global-mode= you can also selectively disable
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When you use [[sym:yas-global-mode][=yas-global-mode=]] you can also selectively disable
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YASnippet in some buffers by setting the buffer-local variable
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=yas-dont-active= in the buffer's mode hook.
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[[sym:yas-dont-active][=yas-dont-active=]] in the buffer's mode hook.
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**** Fallback bahaviour
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=yas-fallback-behaviour= is a customization variable bound to
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='call-other-command= by default. If =yas-expand= failed to find any
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[[sym:yas-fallback-behaviour][=yas-fallback-behaviour=]] is a customization variable bound to
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'=call-other-command= by default. If [[sym:yas-expand][=yas-expand=]] failed to find any
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suitable snippet to expand, it will disable the minor mode temporarily
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and find if there's any other command bound the =yas-trigger-key=.
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and find if there's any other command bound the [[sym:yas-trigger-key][=yas-trigger-key=]].
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If found, the command will be called. Usually this works very well
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--when there's a snippet, expand it, otherwise, call whatever command
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originally bind to the trigger key.
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However, you can change this behavior by customizing the
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=yas-fallback-behavior= variable. If you set this variable to
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='return-nil=, it will return =nil= instead of trying to call the
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[[sym:yas-fallback-behavior][=yas-fallback-behavior=]] variable. If you set this variable to
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'=return-nil=, it will return =nil= instead of trying to call the
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/original/ command when no snippet is found.
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*** Insert at point
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@ -80,34 +80,34 @@ according to the condition system. If you want to see all applicable
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snippets for the major mode, prefix this command with =C-u=.
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The prompting methods used are again controlled by
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=yas-prompt-functions=.
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[[sym:yas-prompt-functions][=yas-prompt-functions=]].
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*** Snippet keybinding
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See the section of the =# binding:= directive in
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[[snippet-development.html][Writing Snippets]].
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[[./snippet-development.org][Writing Snippets]].
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*** Expanding from the menu
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See [[snippet-menu.html][the YASnippet Menu]].
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See [[./snippet-menu.org][the YASnippet Menu]].
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*** Expanding with =hippie-expand=
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To integrate with =hippie-expand=, just put =yas-hippie-try-expand= in
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To integrate with =hippie-expand=, just put [[sym:yas-hippie-try-expand][=yas-hippie-try-expand=]] in
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=hippie-expand-try-functions-list=. This probably makes more sense when
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placed at the top of the list, but it can be put anywhere you prefer.
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*** Expanding from emacs-lisp code
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Sometimes you might want to expand a snippet directly from you own elisp
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code. You should call =yas-expand-snippet= instead of =yas-expand= in
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code. You should call [[sym:yas-expand-snippet][=yas-expand-snippet=]] instead of [[sym:yas-expand][=yas-expand=]] in
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this case.
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As with expanding from the menubar, the condition system and multiple
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candidates doesn't affect expansion. In fact, expanding from the
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YASnippet menu has the same effect of evaluating the follow code:
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See the internal documentation on =yas-expand-snippet= for more
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See the internal documentation on [[sym:yas-expand-snippet][=yas-expand-snippet=]] for more
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information.
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** Controlling expansion
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@ -122,7 +122,7 @@ In particular, the following things matter:
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- Currently loaded snippets tables
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These are loaded from a directory hierarchy in your file system. See
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[[snippet-organization.html][Organizing Snippets]]. They are named
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[[./snippet-organization.org][Organizing Snippets]]. They are named
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after major modes like =html-mode=, =ruby-mode=, etc...
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- Major mode of the current buffer
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@ -138,7 +138,7 @@ In particular, the following things matter:
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also considered. This works recursively, i.e. parents of parents of
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eligible tables are also considered.
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- Buffer-local =yas-mode-symbol= variable
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- Buffer-local [[sym:yas-mode-symbol][=yas-mode-symbol=]] variable
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This can be used to consider snippet tables whose name does not
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correspond to a major mode. If you set this variable to a name , like
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@ -146,7 +146,7 @@ In particular, the following things matter:
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minor mode. Naturally, you want to set this conditionally, i.e. only
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when entering that minor mode, so using a hook is a good idea.
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- Buffer-local =yas-buffer-local-condition= variable
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- Buffer-local [[sym:yas-buffer-local-condition][=yas-buffer-local-condition=]] variable
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This variable provides finer grained control over what snippets can
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be expanded in the current buffer. The default value won't let you
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@ -156,23 +156,23 @@ In particular, the following things matter:
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*** The condition system
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Consider this scenario: you are an old Emacs hacker. You like the
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abbrev-way and set =yas-trigger-key= to ="SPC"=. However, you don't want
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abbrev-way and set [[sym:yas-trigger-key][=yas-trigger-key=]] to =SPC=. However, you don't want
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=if= to be expanded as a snippet when you are typing in a comment block
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or a string (e.g. in =python-mode=).
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If you use the =# condition := directive (see
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[[snippet-development.html][Writing Snippets]]) you could just specify
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[[./snippet-development.org][Writing Snippets]]) you could just specify
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the condition for =if= to be =(not (python-in-string/comment))=. But how
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about =while=, =for=, etc. ? Writing the same condition for all the
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snippets is just boring. So has a buffer local variable
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=yas-buffer-local-condition=. You can set this variable to
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[[sym:yas-buffer-local-condition][=yas-buffer-local-condition=]]. You can set this variable to
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=(not (python-in-string/comment))= in =python-mode-hook=.
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Then, what if you really want some particular snippet to expand even
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inside a comment? This is also possible! But let's stop telling the
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story and look at the rules:
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- If =yas-buffer-local-condition= evaluate to nil, no snippets will be
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- If [[sym:yas-buffer-local-condition][=yas-buffer-local-condition=]] evaluate to nil, no snippets will be
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considered for expansion.
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- If it evaluates to the a /cons cell/ where the =car= is the symbol
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@ -204,7 +204,7 @@ story and look at the rules:
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- Otherwise, it won't be considered.
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In the mentioned scenario, set =yas-buffer-local-condition= like this
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In the mentioned scenario, set [[sym:yas-buffer-local-condition][=yas-buffer-local-condition=]] like this
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... and specify the condition for a snippet that you're going to expand
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in comment to be evaluated to the symbol =force-in-comment=. Then it can
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@ -218,7 +218,7 @@ one snippet to be expanded at point.
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When there are multiple candidates, YASnippet will let you select one.
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The UI for selecting multiple candidate can be customized through
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=yas-prompt-functions= , which defines your preferred methods of being
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[[sym:yas-prompt-functions][=yas-prompt-functions=]] , which defines your preferred methods of being
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prompted for snippets.
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You can customize it with
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@ -227,11 +227,11 @@ can put in your emacs-file:
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Currently there are some alternatives solution with YASnippet.
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[[images/x-menu.png]]
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[[./images/x-menu.png]]
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**** Use the X window system
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The function =yas-x-prompt= can be used to show a popup menu for you to
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The function [[sym:yas-x-prompt][=yas-x-prompt=]] can be used to show a popup menu for you to
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select. This menu will be part of you native window system widget, which
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means:
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@ -241,20 +241,20 @@ means:
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navigate this menu.
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- This function can't be used when in a terminal.
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[[images/ido-menu.png]]
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[[./images/ido-menu.png]]
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**** Minibuffer prompting
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You can use functions =yas-completing-prompt= for the classic emacs
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completion method or =yas-ido-prompt= for a much nicer looking method.
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You can use functions [[sym:yas-completing-prompt][=yas-completing-prompt=]] for the classic emacs
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completion method or [[sym:yas-ido-prompt][=yas-ido-prompt=]] for a much nicer looking method.
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The best way is to try it. This works in a terminal.
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[[images/dropdown-menu.png]]
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[[./images/dropdown-menu.png]]
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**** Use =dropdown-menu.el=
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The function =yas-dropdown-prompt= can also be placed in the
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=yas-prompt-functions= list.
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The function [[sym:yas-dropdown-prompt][=yas-dropdown-prompt=]] can also be placed in the
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[[sym:yas-prompt-functions][=yas-prompt-functions=]] list.
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This works in both window system and terminal and is customizable, you
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can use =C-n=, =C-p= to navigate, =q= to quit and even press =6= as a
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@ -262,80 +262,5 @@ shortcut to select the 6th candidate.
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**** Roll your own
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See below for the documentation on variable =yas-prompt-functions=
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See the documentation on variable [[sym:yas-prompt-functions][=yas-prompt-functions=]]
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** Customizable Variables
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*** =yas-prompt-functions=
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You can write a function and add it to the =yas-prompt-functions= list.
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These functions are called with the following arguments:
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- PROMPT: A string to prompt the user;
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- CHOICES: A list of strings or objects;
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- optional DISPLAY-FN : A function. When applied to each of the objects
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in CHOICES it will return a string;
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The return value of any function you put here should be one of the
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objects in CHOICES, properly formatted with DISPLAY-FN (if that is
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passed).
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- To signal that your particular style of prompting is unavailable at
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the moment, you can also have the function return nil.
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- To signal that the user quit the prompting process, you can signal
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=quit= with =(signal 'quit "user quit!")=
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*** =yas-fallback-behavior=
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How to act when =yas-expand= does /not/ expand a snippet.
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- =call-other-command= means try to temporarily disable YASnippet
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and :: call the next command bound to =yas-trigger-key=.
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=return-nil= means return nil. (i.e. do nothing)
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An entry (apply COMMAND . ARGS) means interactively call COMMAND, if
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ARGS is non-nil, call COMMAND non-interactively with ARGS as arguments.
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*** =yas-choose-keys-first=
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If non-nil, prompt for snippet key first, then for template.
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Otherwise prompts for all possible snippet names.
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This affects =yas-insert-snippet= and =yas-visit-snippet-file=.
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*** =yas-choose-tables-first=
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If non-nil, and multiple eligible snippet tables, prompts user for
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tables first.
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Otherwise, user chooses between the merging together of all eligible
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tables.
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This affects =yas-insert-snippet=, =yas-visit-snippet-file=
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*** =yas-key-syntaxes=
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The default searching strategy is quite powerful. For example, in
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=c-mode=, =bar=, =foo_bar=, ="#foo_bar"= can all be recognized as a
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snippet key. Furthermore, the searching is in that order. In other
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words, if =bar= is found to be a key to some /valid/ snippet, then that
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snippet is expanded and replaces the =bar=. Snippets pointed to by
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=foo_bar= and ="#foobar= won't be considered.
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However, this strategy can also be customized easily from the
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=yas-key-syntaxes= variable. It is a list of syntax rules, the default
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value is =("w" "w_" "w_." "^ ")=. Which means search the following thing
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until found one:
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- a word.
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- a symbol. In lisp, =-= and =?= can all be part of a symbol.
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- a sequence of characters of either word, symbol or punctuation.
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- a sequence of characters of non-whitespace characters.
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But you'd better keep the default value unless you want to understand
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how Emacs's syntax rules work...
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