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/* nl.c - print line numbers
*
* Copyright 2013 CE Strake <strake888@gmail.com>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/nl.html
*
* This implements a subset: only one logical page (-ip), no sections (-dfh).
* todo: -lv
USE_NL(NEWTOY(nl, "v#<1=1l#b:n:s:w#<0=6E", TOYFLAG_BIN))
config NL
bool "nl"
default n
help
usage: nl [-E] [-l #] [-b MODE] [-n STYLE] [-s SEPARATOR] [-w WIDTH] [FILE...]
Number lines of input.
-E Use extended regex syntax (when doing -b pREGEX)
-b which lines to number: a (all) t (non-empty, default) pREGEX (pattern)
-l Only count last of this many consecutive blank lines
-n number STYLE: ln (left justified) rn (right justified) rz (zero pad)
-s Separator to use between number and line (instead of TAB)
-w Width of line numbers (default 6)
*/
#define FOR_nl
#include "toys.h"
#include "lib/xregcomp.h"
GLOBALS(
long w;
char *s;
char *n;
char *b;
long l;
long v;
// Count of consecutive blank lines for -l has to persist between files
long lcount;
)
void do_nl(int fd, char *name)
{
FILE *f = xfdopen(fd, "r");
int w = TT.w, slen = strlen(TT.s);
for (;;) {
char *line = 0;
size_t temp;
int match = *TT.b != 'n';
if (getline(&line, &temp, f) < 1) {
if (ferror(f)) perror_msg("%s", name);
break;
}
if (*TT.b == 'p') match = !regexec((void *)(toybuf+16), line, 0, 0, 0);
if (TT.l || *TT.b == 't')
if (*line == '\n') match = TT.l && ++TT.lcount >= TT.l;
if (match) {
TT.lcount = 0;
printf(toybuf, w, TT.v++, TT.s);
} else printf("%*c", (int)w+slen, ' ');
xprintf("%s", line);
free(line);
}
fclose(f);
}
void nl_main(void)
{
char *clip = "";
if (!TT.s) TT.s = "\t";
if (!TT.n || !strcmp(TT.n, "rn")); // default
else if (!strcmp(TT.n, "ln")) clip = "-";
else if (!strcmp(TT.n, "rz")) clip = "0";
else error_exit("bad -n '%s'", TT.n);
sprintf(toybuf, "%%%s%s", clip, "*ld%s");
if (!TT.b) TT.b = "t";
if (*TT.b == 'p' && TT.b[1])
xregcomp((void *)(toybuf+16), TT.b+1,
REG_NOSUB | (toys.optflags&FLAG_E)*REG_EXTENDED);
else if (!strchr("atn", *TT.b)) error_exit("bad -b '%s'", TT.b);
loopfiles (toys.optargs, do_nl);
}
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