wrap lines by default

And add a -t option to truncate lines.

Truncating by default is too surprising, I feel.

src/main.c

@@ -1,6 +1,7 @@
 #include "config.h"
 #include <getopt.h>
 #include <locale.h>
+#include <math.h>
 #include <ncurses.h>
 #include <readline/readline.h>
 #include <stdio.h>
@@ -13,6 +14,8 @@
 #define PROGRAM_NAME "pipeline"
 char *program_name = PROGRAM_NAME;
 
+bool truncate_lines = false;
+
 int abort_ltz(int res) {
  if (res < 0) {
  perror(NULL);
@@ -91,12 +94,12 @@ void read_show_output(FILE *s, size_t *shown, size_t *total) {
  wchar_t *line = NULL;
  size_t cap = 0;
  ssize_t display_len;
- while ((display_len = read_line(s, &line, &cap, COLS)) >= 0) {
+ while ((display_len = read_line(s, &line, &cap, truncate_lines ? COLS : SIZE_MAX)) >= 0) {
  *total += 1;
  // if we haven't filled the screen yet, display this line.
  if (*shown < LINES - 2) {
  printf("%ls\n", line);
- *shown += 1;
+ *shown += (int)ceil((double)display_len / COLS);
  }
  }
  free(line);
@@ -184,12 +187,15 @@ int setup() {
 }
 
 static struct option const long_options[] = {
+ {"truncate", no_argument, NULL, 't'},
  {"help", no_argument, NULL, 'h'},
  {"version", no_argument, NULL, 'v'},
  {NULL, 0, NULL, 0}};
 
 void usage(int status) {
- printf("Usage: %s\n", program_name);
+ printf("Usage: %s [OPTIONS]\n", program_name);
+ printf("\n");
+ printf(" -t, --truncate Truncate long lines rather than wrapping.\n");
  exit(status);
 }
 
@@ -203,16 +209,19 @@ int main(int argc, char *const *argv) {
  program_name = argv[0];
  char *locale = setlocale(LC_ALL, "");
  int c;
- while ((c = getopt_long(argc, argv, "hv", long_options, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "thv", long_options, NULL)) != -1) {
  switch (c) {
- case 'h':
- usage(EXIT_SUCCESS);
- break;
- case 'v':
- version();
- break;
- default:
- usage(EXIT_FAILURE);
+ case 't':
+ truncate_lines = true;
+ break;
+ case 'h':
+ usage(EXIT_SUCCESS);
+ break;
+ case 'v':
+ version();
+ break;
+ default:
+ usage(EXIT_FAILURE);
  }
  }