Add auto-pager

1 files changed, 16 insertions, 6 deletions

diff --git a/src/main.c b/src/main.c
index 5d4a097..23e59b8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
 
 #include "arg.h"
@@ -52,10 +53,25 @@ void run(FILE *fp, char *filename, bool tty) {
   struct filedata f;
   f = readfile(fp, conf.isstdin);
 
+  // any/all processing to be done
+  // TODO: maybe multithread?
+  conf.process = (tty && !f.binary);
+  if (conf.process) { // file display processing
+    loadlines(&f);
+  }
+
   if (conf.extension != NULL) {
     // TODO
   }
 
+  struct winsize w;
+
+  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1 || w.ws_col != 0) {
+    if (w.ws_row <= f.lc + 5) {
+      conf.pager = !conf.pager;
+    }
+  }
+
   if (conf.pager) {
     st = popen("less", "w");
     err = st;
@@ -78,12 +94,6 @@ void run(FILE *fp, char *filename, bool tty) {
     printheadertop(filename, f.binary);
   }
 
-  // any/all processing to be done
-  conf.process = (tty && !f.binary);
-  if (conf.process) { // file display processing
-    loadlines(&f);
-  }
-
   if (conf.process) {
     int linecount = 1;
     for (int i = 0; i < f.lc; i++) {