Add auto-pager

.gitignore

@@ -130,5 +130,3 @@ $RECYCLE.BIN/
 *.lnk
 
 # End of https://www.toptal.com/developers/gitignore/api/c,macos,windows,linux,c
-
-build/

Makefile

@@ -34,7 +34,6 @@ prep:
 	-@mkdir -p $(IDIR)
 	-@mkdir -p $(ODIR)
 	-@mkdir -p $(BINDIR)
-	@echo $(BINDIR)/ >> .gitignore
 
 .PHONY: clean
 clean:

include/arg.h

@@ -2,7 +2,7 @@
 #define ARG_H
 #include <stdbool.h>
 
-#define LAT_VERSION "0.12.4"
+#define LAT_VERSION "0.13.0"
 
 struct config {
   bool isstdin;

src/lib/arg.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdnoreturn.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
 
 #include "arg.h"
@@ -24,9 +25,10 @@ void help(void) {
          "binary\n"
          "\t-r           print everything (headers, line numbers, etc.) to "
          "stdout (or equivalent)\n"
-         "\t-p           print file with the pager (uses less)\n"
+         "\t-p           disable or enable pager (uses less)\n"
          "\t-n <name>    manually set the name of the file shown in the title\n"
-         // "\t-e <program> NONFUNCTIONAL (will be added soon)  link extension to lat\n"
+         // "\t-e <program> NONFUNCTIONAL (will be added soon)  link extension
+         // to lat\n"
          "\t-V           show program version\n"
          "\t-h           display this help text\n\n");
   printf("environment:\n"

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++) {