Make improvements

- Expand redbean UNIX module
- Expand redbean documentation
- Ensure Lua copyright is embedded in binary
- Increase the PATH_MAX limit especially on NT
- Use column major sorting for linenoise completions
- Fix some suboptimalities in redbean's new UNIX API
- Figured out right flags for Multics newline in raw mode

libc/runtime/paginate.c

@@ -0,0 +1,57 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/bits/safemacros.internal.h"
+#include "libc/calls/calls.h"
+#include "libc/fmt/fmt.h"
+#include "libc/runtime/runtime.h"
+#include "libc/str/str.h"
+#include "libc/sysv/consts/o.h"
+#include "libc/x/x.h"
+
+/**
+ * Displays wall of text in terminal with pagination.
+ */
+void __paginate(int fd, const char *s) {
+  int tfd, pid;
+  char *args[3] = {0};
+  char tmppath[PATH_MAX + 1];
+  char progpath[PATH_MAX + 1];
+  if (strcmp(nulltoempty(getenv("TERM")), "dumb") && isatty(0) && isatty(1) &&
+      ((args[0] = commandv("less", progpath, sizeof(progpath))) ||
+       (args[0] = commandv("more", progpath, sizeof(progpath))))) {
+    snprintf(tmppath, sizeof(tmppath), "%s%s-%s-%d.txt", kTmpPath,
+             program_invocation_short_name, "paginate", getpid());
+    if ((tfd = open(tmppath, O_WRONLY | O_CREAT | O_TRUNC, 0644)) != -1) {
+      write(tfd, s, strlen(s));
+      close(tfd);
+      args[1] = tmppath;
+      if ((pid = vfork()) != -1) {
+        if (!pid) {
+          execv(args[0], args);
+          _Exit(127);
+        }
+        waitpid(pid, 0, 0);
+        unlink(tmppath);
+        return;
+      }
+      unlink(tmppath);
+    }
+  }
+  write(fd, s, strlen(s));
+}