# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1625404267 -7200
# Node ID c368b4f6ee04bdac8cac7754fec5823a25e030e7
# Parent  bbf50525faa5cce205f889b75288f85078eb8632
util.pposix: Bind isatty(3)

Useful for disabling certain behavior, ANSI colors etc when not
connected to a terminal.

diff -r bbf50525faa5 -r c368b4f6ee04 teal-src/util/pposix.d.tl
--- a/teal-src/util/pposix.d.tl	Sun Jul 04 02:33:15 2021 +0200
+++ b/teal-src/util/pposix.d.tl	Sun Jul 04 15:11:07 2021 +0200
@@ -98,6 +98,8 @@
 
 	atomic_append : function (f : FILE, s : string) : boolean, string, integer
 
+	isatty : function(FILE) : boolean
+
 	ENOENT : integer
 	_NAME : string
 	_VESRION : string
diff -r bbf50525faa5 -r c368b4f6ee04 util-src/pposix.c
--- a/util-src/pposix.c	Sun Jul 04 02:33:15 2021 +0200
+++ b/util-src/pposix.c	Sun Jul 04 15:11:07 2021 +0200
@@ -812,6 +812,13 @@
 	return 3;
 }
 
+static int lc_isatty(lua_State *L) {
+	FILE *f = *(FILE **) luaL_checkudata(L, 1, LUA_FILEHANDLE);
+	const int fd = fileno(f);
+	lua_pushboolean(L, isatty(fd));
+	return 1;
+}
+
 /* Register functions */
 
 int luaopen_util_pposix(lua_State *L) {
@@ -853,6 +860,8 @@
 
 		{ "atomic_append", lc_atomic_append },
 
+		{ "isatty", lc_isatty },
+
 		{ NULL, NULL }
 	};