tools/stpaster

#!/usr/bin/tcc -run
/* vim: set syn=c: */

/*
 * stpaster intends to pass st(1) terminal content to dmenu(1) for rapid
 * selection and finaly in xclip(1) for pasting easily.
 *
 * Remove empty lines from stdin and output full‐lines, WORDS splited by
 * space/tab, words splited by work breakers.
 *
 * see st & externalpipe patch.
 * http://st.suckless.org/
 * http://st.suckless.org/patches/externalpipe
 *
 * is_word_break() comes from :
 * http://st.suckless.org/patches/configwordbreak
 *
 * Add to config.h shortcuts :
 * { MODKEY, 'u', externalpipe, {.v = "trim | stpaster | sort -u | dmenu -i -l 5 | removenl | xclip -in -selection c" } },
 *
 * memo :
 * 0x09 - horizontal tab
 * 0x0a - linefeed
 * 0x0b - vertical tab
 * 0x0c - form feed
 * 0x0d - carriage return
 * 0x20 - space
 **/

#include <stdlib.h>
#include <stdio.h>

#define WORD_BREAK " ()<>[]\",/:'."

static unsigned int is_word_break(char c);

int
main() {
	char		*line 	= NULL;
	size_t		len 	= 0;
	ssize_t		nread	= 0;
	unsigned int	i	= 0;

	unsigned int	wasblank 	= 1;
	unsigned int	emptyline 	= 1;

	while ((nread = getline(&line, &len, stdin)) != -1) {
		/* remove empty lines */
		emptyline = 1;
		for (i = 0; i < nread; ++i)
			if(line[i] != 0x20 && line[i] != 0x09 && line[i] != 0x0a)
				emptyline = 0;
		if (emptyline)
			continue;

		/* print each lines as is*/
		printf("%s", line);

		/* split each lines on space/tab */
		for (i = 0; i < nread; ++i)
			if (line[i] != 0x20 && line[i] != 0x09) {
				wasblank = 0;
				printf("%c", line[i]);
			} else if (!wasblank) {
				wasblank = 1;
				printf("\n");
			}

		wasblank = 1;
		/* split each lines on word breaker */
		for (i = 0; i < nread; ++i)
			if (!is_word_break(line[i])) {
				wasblank = 0;
				printf("%c", line[i]);
			} else if (!wasblank) {
				wasblank = 1;
				printf("\n");
			}
	}

	return 0;
}

unsigned int
is_word_break(char c) {
	static char *word_break = WORD_BREAK;
	char *s = word_break;
	while (*s) {
		if (*s == c)
			return 1;
		s++;
	}

	return 0;
}