1 files changed, 94 insertions, 0 deletions
diff --git a/toys/posix/nl.c b/toys/posix/nl.c
new file mode 100644
index 00000000..b462cddd
--- /dev/null
+++ b/toys/posix/nl.c
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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 y
+  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);
+}