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[util] Add --help-features 

Patch from Khaled Hosny.
This commit is contained in:
Behdad Esfahbod 2012-01-18 22:47:44 -05:00
parent 889caa52fa
commit 8750abaf84
1 changed files with 41 additions and 1 deletions
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42
util/options.cc
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@ -391,7 +391,6 @@ shape_options_t::add_options (option_parser_t *parser)
{"direction", 0, 0, G_OPTION_ARG_STRING, &this->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
{"language", 0, 0, G_OPTION_ARG_STRING, &this->language, "Set text language (default: $LANG)", "langstr"},
{"script", 0, 0, G_OPTION_ARG_STRING, &this->script, "Set text script (default: auto)", "ISO-15924 tag"},
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, "Font features to apply to text", "TODO"},
{NULL}
};
parser->add_group (entries,
@ -399,6 +398,47 @@ shape_options_t::add_options (option_parser_t *parser)
"Shape options:",
"Options controlling the shaping process",
this);
const gchar *features_help = "\n"
"\n"
" Comma-separated list of font features to apply to text\n"
"\n"
" Features can be enabled or disabled, either globally or limited to\n"
" specific byte ranges. The format is Python-esque. Here is how it all\n"
" works:\n"
"\n"
" Syntax: Value: Start: End:\n"
"\n"
" Setting value:\n"
" \"kern\" 1 0 ∞ # Turn feature on\n"
" \"+kern\" 1 0 ∞ # Turn feature on\n"
" \"-kern\" 0 0 ∞ # Turn feature off\n"
" \"kern=0\" 0 0 ∞ # Turn feature off\n"
" \"kern=1\" 1 0 ∞ # Turn feature on\n"
" \"aalt=2\" 2 0 ∞ # Choose 2nd alternate\n"
"\n"
" Setting index:\n"
" \"kern[]\" 1 0 ∞ # Turn feature on\n"
" \"kern[:]\" 1 0 ∞ # Turn feature on\n"
" \"kern[5:]\" 1 5 ∞ # Turn feature on, partial\n"
" \"kern[:5]\" 1 0 5 # Turn feature on, partial\n"
" \"kern[3:5]\" 1 3 5 # Turn feature on, range\n"
" \"kern[3]\" 1 3 3+1 # Turn feature on, single char\n"
"\n"
" Mixing it all:\n"
"\n"
" \"kern[3:5]=0\" 1 3 5 # Turn feature off for range";
GOptionEntry entries2[] =
{
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, features_help, "list"},
{NULL}
};
parser->add_group (entries2,
"features",
"Features options:",
"Options controlling the OpenType font features applied",
this);
}
void