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Draft: Add support for SVG output

Wismill requested to merge wismill/xkbprint:svg into master

Add the -svg CLI option to generate UTF-8 encoded SVG 1.1. Some key differences with the PostScript output:

  • New layers are created instead of pages, as this concept is not relevant for SVG.
  • Some options are ignored for SVG: -fit, -full, -if, -n, -npk.
  • Some options are not yet implemented: -color, -mono, -grid.
  • The Unicode character corresponding to a keysym is used whenever possible, instead of the keysym name.
  • Dead key representation uses the corresponding combining character, e.g. “◌́” for dead_acute.
  • Keysym names are made more user friendly by removing some prefixes (KP_, ISO_, XF86) and suffixes (_L, _R).
  • If there is only one group per key displayed, then up to four levels are displayed, instead of only two for PostScript.
  • When using -label none, label placeholders are created, so they can be filled later, e.g. by modifying the SVG in a web page using Javascript.
  • Using debug mode -d makes drawing the text fields borders.

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