Re: [Tuxpaint-devel] Using libtextwrap in Tux Paint Config.

[Bill K. <nb...@so...>]

On Mon, Nov 15, 2021 at 01:40:46AM -0800, Bill Kendrick wrote:
<snip>
> Oh, libunibreak might be useful.  As with libtextwrap, I see it's
> available in Ubuntu 20.04.  However, before I make any more tectonic
> shifts in the Tux Paint Config. codebase, I'd better make sure it's
> available everywhere. :)
> 
> I'm encouraged to see the code is still maintained (last commit was
> one week ago), and I'll play with it a little and see whether it
> seems to do what we need.

So I see that this library simply provides a 'map' of where
breaks would be possible.

I put together a little sample program that takes an input
string and constructs one that includes the "~" hints that
the current code is using for word-wrapping:

  $ gcc linebreak-test.c -o linebreak-test -l unibreak && ./linebreak-test 
  タックスペイントを、ウィンドウ内ではなく、画面全体に表示します。ABC 123
  3313313313313313313313313323313313313313313313313313313313323313313313313313313313313313313323312221220
  111111112111111111121111111111212221220
  タ~ッ~ク~ス~ペ~イ~ン~ト~を、~ウ~ィ~ン~ド~ウ~内~で~は~な~く、~画~面~全~体~に~表~示~し~ま~す。~ABC 123

So the good news is, there'll be no need to manually introduce
them into the translated strings.


Here's the code:

========================================================================
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <linebreak.h>

/* gcc linebreak-test.c -o linebreak-test -l unibreak */
// #define LINEBREAK_MUSTBREAK     0       /**< Break is mandatory */
// #define LINEBREAK_ALLOWBREAK    1       /**< Break is allowed */
// #define LINEBREAK_NOBREAK       2       /**< No break is possible */
// #define LINEBREAK_INSIDEACHAR   3       /**< A UTF-8/16 sequence is unfinished */

int main(int argc, char * argv[]) {
  char * str = "タックスペイントを、ウィンドウ内ではなく、画面全体に表示します。ABC 123";
  char * brks, * newstr;
  size_t i, j;
  int possible_split_count;

  brks = malloc(strlen(str) + 1);
  init_linebreak();
  set_linebreaks_utf8(str, strlen(str), "ja_JP.utf-8", brks);
  printf("%s\n", str);
  for (i = 0; i < strlen(str); i++) {
    printf("%d", brks[i]);
  }
  printf("\n");

  possible_split_count = 0;
  for (i = 0; i < strlen(str); i++) {
    if (brks[i] == LINEBREAK_ALLOWBREAK) {
      possible_split_count++;
    }
    if (brks[i] != LINEBREAK_INSIDEACHAR) {
      printf("%d", brks[i]);
    }
  };
  printf("\n");

  newstr = (char *) malloc(sizeof(char) * (strlen(str) + possible_split_count + 1));
  j = 0;
  for (i = 0; i < strlen(str); i++) {
    newstr[j++] = str[i];
    if (brks[i] == LINEBREAK_ALLOWBREAK && str[i] != ' ') {
      newstr[j++] = '~';
    }
  }
  printf("%s\n", newstr);
  return (0);
}
========================================================================

-- 
-bill!
Sent from my computer