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An emacs minor mode to surround the region with smart delimiters interactively.
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README.md

siege-mode

An emacs minor mode to surround the region with smart delimiters interactively.

siege-mode.gif

Lay siege to the region from both sides!

(with the power of regular expressions)

When the region is active, most input¹ is redirected to the minibuffer and treated as a delimiter for the region. The input is used as the left delimiter from which the right one is derived using siege-transform-regexs applied to tokens generated by siege-boundary-list' and siege-block-*. If such derivations are not desired they may be disabled via "C-c a" in the minibuffer or by default (siege-default-derive). This process may be explicitly invoked by calling siege-explicit-call`, bound to "M-s M-s".

All changes are dynamically displayed in the buffer (see siege-preview-face) and may be committed by "Ret" in the minibuffer. It is also possible to commit the input on "space" as set by siege-default-end-on-space and toggled by "C-c s" in the minibuffer.

By default siege-mode understands the usual delimeter pairs, as well as latex LaTeX begin/end pairs and left/right pairs. Moreover, for ease of use it will pair both _{ and ^{ with } by default.

Installation

To install the package, you use quelpa-use-package

  (use-package siege-mode
    :ensure quelpa
    :quelpa (siege-mode :repo "tslilc/siege-mode" :fetcher github))

License

GPL v3+

Technical note

¹ siege-mode remaps self-insert-command so that key-presses which would otherwise simply insert a character trigger delimiter input. This would seem to be the best compromise between usability and unobtrusiveness, but the author is certainly open to suggestion.

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