chore: tty check

README.md

@@ -98,7 +98,7 @@ maretf info input.vtf
 ## Full CLI Help Text
 
 ```
-Usage: maretf [--help] [--output PATH] [--yes] [--no] [--quiet] [--no-recurse]
+Usage: maretf [--help] [--output PATH] [--yes] [--no] [--quiet] [--verbose] [--no-recurse]
               [--no-pretty-formatting] [--watch] [--version X.Y] [--format IMAGE_FORMAT]
               [--quality COMPRESSION_QUALITY] [--filter RESIZE_FILTER] [--flag FLAG]...
               [--no-automatic-transparency-flags] [--no-mips] [--no-animation]
@@ -146,15 +146,22 @@ Optional arguments:
   -o, --output PATH                            The path to the output file (if the current
                                                mode outputs a file). Ignored if the input
                                                path is a directory.
-  -y, --yes                                    Automatically say yes to any prompts.
+  -y, --yes                                    Automatically say yes to any prompts. Enabled
+                                               by default if no TTY is detected.
   --no                                         Automatically say no to any prompts. Overrides
                                                --yes.
   --quiet                                      Don't print anything to stdout or stderr
                                                (assuming program arguments are parsed
-                                               successfully).
+                                               successfully). Enabled by default if no TTY is
+                                               detected.
+  --verbose                                    Allow printing to stdout or stderr, even when
+                                               no TTY is detected (assuming program arguments
+                                               are parsed successfully).
   --no-recurse                                 If the input path is a directory, do not enter
                                                subdirectories when scanning for files.
   --no-pretty-formatting                       Disables printing ANSI color codes and emojis.
+                                               Pretty formatting is disabled by default if no
+                                               TTY is detected.
 
 "create" mode (detailed usage):
   --watch                                      After creation is complete, watch the input

src/cli/MareTF.cpp

@@ -4,6 +4,7 @@
 #include <algorithm>
 #include <chrono>
 #include <csignal>
+#include <cstdio>
 #include <cstdlib>
 #include <filesystem>
 #include <format>
@@ -20,9 +21,12 @@
 #include <unordered_map>
 #include <utility>
 
-#ifdef _WIN32
+#if defined(_WIN32)
+#include <io.h>
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
+#elif defined(__linux__)
+#include <unistd.h>
 #endif
 
 #include <argparse/argparse.hpp>
@@ -41,6 +45,17 @@ using namespace std::literals;
 
 namespace {
 
+[[nodiscard]] bool runningInTTY() {
+#if defined(_WIN32)
+	static const bool check = _isatty(_fileno(stdout)) && _isatty(_fileno(stderr));
+#elif defined(__linux__)
+	static const bool check = isatty(STDOUT_FILENO) && isatty(STDERR_FILENO);
+#else
+	static constexpr bool check = true;
+#endif
+	return check;
+}
+
 [[nodiscard]] std::string_view randomDeviantArtTFTrope() {
 	static constexpr std::array<std::string_view, 23> DEVIANTART_TF_TROPES{
 		"Splicing DNA",
@@ -226,7 +241,7 @@ int main(int argc, const char* const argv[]) {
 	bool overwrite;
 	cli
 		.add_argument("-y", "--yes")
-		.help("Automatically say yes to any prompts.")
+		.help("Automatically say yes to any prompts. Enabled by default if no TTY is detected.")
 		.flag()
 		.store_into(overwrite);
 
@@ -240,10 +255,19 @@ int main(int argc, const char* const argv[]) {
 	bool quiet;
 	cli
 		.add_argument("--quiet")
-		.help("Don't print anything to stdout or stderr (assuming program arguments are parsed successfully).")
+		.help("Don't print anything to stdout or stderr (assuming program arguments are parsed successfully)."
+		      " Enabled by default if no TTY is detected.")
 		.flag()
 		.store_into(quiet);
 
+	bool verbose;
+	cli
+		.add_argument("--verbose")
+		.help("Allow printing to stdout or stderr, even when no TTY is detected (assuming program arguments"
+		      " are parsed successfully).")
+		.flag()
+		.store_into(verbose);
+
 	bool noRecurse;
 	cli
 		.add_argument("--no-recurse")
@@ -254,7 +278,8 @@ int main(int argc, const char* const argv[]) {
 	bool noPrettyFormatting;
 	cli
 		.add_argument("--no-pretty-formatting")
-		.help("Disables printing ANSI color codes and emojis.")
+		.help("Disables printing ANSI color codes and emojis. Pretty formatting is disabled by default"
+		      " if no TTY is detected.")
 		.flag()
 		.store_into(noPrettyFormatting);
 
@@ -994,9 +1019,17 @@ int main(int argc, const char* const argv[]) {
 	try {
 		cli.parse_args(argc, argv);
 
-		if (quiet) {
+		if (!::runningInTTY()) {
+			overwrite = true;
+			quiet = true;
+			noPrettyFormatting = true;
+		}
+
+		if (quiet && !verbose) {
 			tfout_t::QUIET = true;
 			tferr_t::QUIET = true;
+		} else {
+			quiet = false;
 		}
 
 		// Pretty formatting colors