added invert option

include/basic_color_printer.tpp

@@ -31,12 +31,16 @@
 
 template<int I>
 constexpr basic_color_printer<I>::basic_color_printer(const cmd_args& args)noexcept:
-	color_printer_base<basic_color_printer<I>>(args),
+	color_printer_base<basic_color_printer<I>>(args, args.invert ? L"\033[38;5;0m\033[48;5;%sm" : L"\033[38;5;%sm"),
 	m_randomness(rand()%color_lookup_len){}
 template<int I>
 basic_color_printer<I>& basic_color_printer<I>::_print(const wchar_t s)noexcept{
 	if(s == L'\n'){
 		inc_line();
+		if(this->m_invert)
+			this->reset();
+		putwchar(L'\n');
+		return *this;
 	}else{
 		int width = wcwidth(s);
 		if(width > 0)
@@ -49,7 +53,7 @@ basic_color_printer<I>& basic_color_printer<I>::_print(const wchar_t s)noexcept{
 		new_index += color_lookup_len;
 	if(new_index != m_index){
 		m_index = new_index;
-		wprintf(L"\033[38;5;%sm", color_lookup_table[m_index]);
+		wprintf(this->m_color_str, color_lookup_table[m_index]);
 	}
 	putwchar(s);
 	return *this;

include/cmd.hpp

@@ -45,11 +45,12 @@ struct cmd_args{
 	std::vector<const char*> filenames;
 
 	//lolcat options
+	long seed = 0;
 	float freq = 0.2f;
 	float spread = 0.3f;
-	long seed = 0;
 	unsigned truecol:1;
 	unsigned color:2;
+	unsigned invert:1;
 
 	//GNU cat options
 	unsigned number:2;

include/color_printer_base.hpp

@@ -27,12 +27,15 @@ template<class Derived>
 class color_printer_base : public printer_base<Derived>
 {
 protected:
+	const wchar_t* const m_color_str;
 	const float m_freq;
 	const float m_spread;
+	const bool m_invert;
 protected:
-	constexpr color_printer_base(const cmd_args& args)noexcept:
+	constexpr color_printer_base(const cmd_args& args, const wchar_t* col_str)noexcept:
 		printer_base<Derived>(args.tabs ? SHOW_TABS_STRING : L"        ", args),
-		m_freq(args.freq), m_spread(m_freq < 0 ? -args.spread : args.spread){}
+		m_color_str(col_str),
+		m_freq(args.freq), m_spread(m_freq < 0 ? -args.spread : args.spread), m_invert(args.invert){}
 	Derived& _reset(void){
 		wprintf(L"\033[0m");
 		return static_cast<Derived&>(*this);

include/color_printer_true.hpp

@@ -96,7 +96,7 @@ private:
 	}m_line_color = {}, m_color = m_line_color;
 public:
 	constexpr color_printer_true(const cmd_args& args)noexcept:
-		color_printer_base<color_printer_true>(args){}
+		color_printer_base<color_printer_true>(args, args.invert ? L"\033[38;5;0m\033[48;2;%s;%s;%sm" : L"\033[38;2;%s;%s;%sm"){}
 
 protected:
 	color_printer_true& _print(const wchar_t s)noexcept{
@@ -104,6 +104,10 @@ protected:
 		if(s == L'\n'){
 			inc_line();
 			updated = true;
+			if(m_invert)
+				reset();
+			putwchar(L'\n');
+			return *this;
 		}else{
 			int width = wcwidth(s);
 			if(width > 0)
@@ -112,10 +116,13 @@ protected:
 				updated = inc_color(1);
 		}
 		if(updated)
-			wprintf(L"\033[38;2;%s;%s;%sm", lookup_table[m_color.r], lookup_table[m_color.g], lookup_table[m_color.b]);
+			wprintf(m_color_str, lookup_table[m_color.r], lookup_table[m_color.g], lookup_table[m_color.b]);
 		putwchar(s);
 		return *this;
 	}
+	color_printer_true& _reset(void){
+		return color_printer_base<color_printer_true>::_reset();
+	}
 	constexpr void inc_line(void){
 		int amount = m_spread*(float{color_max_amount}/4);
 		_do_inc_color(amount, m_line_color);

src/cmd.cpp

@@ -82,6 +82,7 @@ static constexpr const char FREQ_LONG_OPTION[] =             "freq" REQ_FLOAT_AR
 static constexpr const char TRUECOLOR_LONG_OPTION[] =        "truecolor";
 static constexpr const char FORCE_COLOR_LONG_OPTION[] =      "force";
 static constexpr const char DISABLE_COLOR_LONG_OPTION[] =    "no-color";
+static constexpr const char INVERT_LONG_OPTION[] =           "invert";
 
 static constexpr const char IGNORE_ANIMATE_LONG_OPTION[] =   "animate";
 static constexpr const char IGNORE_DURATION_LONG_OPTION[] =  "duration" REQ_INTEGER_ARG;
@@ -96,6 +97,7 @@ static constexpr const char SHOW_ENDS_SHORT_OPTION[] =       "E";
 static constexpr const char FORCE_COLOR_SHORT_OPTION[] =     "f";
 static constexpr const char FREQ_SHORT_OPTION[] =            "F";
 static constexpr const char USAGE_SHORT_OPTION[] =           "h";
+static constexpr const char INVERT_SHORT_OPTION[] =          "i";
 static constexpr const char NUMBER_LINES_SHORT_OPTION[] =    "n";
 static constexpr const char DISABLE_COLOR_SHORT_OPTION[] =   "N";
 static constexpr const char SPREAD_SHORT_OPTION[] =          "p";
@@ -135,6 +137,7 @@ static constexpr const char TRUECOLOR_DESC[] =               "24-bit (truecolor)
 static constexpr const char FORCE_COLOR_DESC[] =             "Force color even when stdout is not a tty";
 static constexpr const char DISABLE_COLOR_DESC_BASE[] =      "Suppress color even when stdout is a tty, overrides -";
 static constexpr const char* DISABLE_COLOR_DESC =            concat_many_strs<DISABLE_COLOR_DESC_BASE,FORCE_COLOR_SHORT_OPTION>::str;
+static constexpr const char INVERT_DESC[] =                  "Change background color instead of foreground";
 
 static constexpr const char* IGNORE_ANIMATE_DESC =           IGNORED_DESC;
 static constexpr const char* IGNORE_DURATION_DESC =          IGNORED_DESC;
@@ -274,6 +277,9 @@ cmd_args process_cmd_args(int argc, char** argv){
 					if(ret.color == COLOR_DEFAULT)
 						ret.color = COLOR_FORCE;
 					break;
+				case SHORT_OPT(INVERT):
+					ret.invert = 1;
+					break;
 				case SHORT_OPT(SEED):
 					CHECK_VALID_SHORT_INT_ARG(SEED, argv[next_arg]);
 					ret.seed = atol(argv[next_arg]);
@@ -329,6 +335,8 @@ cmd_args process_cmd_args(int argc, char** argv){
 			}else if(CHECK_LONG_OPTION(FORCE_COLOR, arg)){
 				if(ret.color == COLOR_DEFAULT)
 					ret.color = COLOR_FORCE;
+			}else if(CHECK_LONG_OPTION(INVERT, arg)){
+				ret.invert = 1;
 			}else if(CHECK_LONG_OPTION_WITH_ARG(SEED, arg)){
 				constexpr size_t offset = strlen_pre_eq(SEED_LONG_OPTION);
 				CHECK_VALID_LONG_INT_ARG(SEED, offset, arg);
@@ -381,6 +389,7 @@ const cmd_options cmd_arguments_list[] = {
 	OPTION(IGNORE_ANIMATE),
 	OPTION(IGNORE_DURATION),
 	OPTION(IGNORE_SPEED),
+	OPTION(INVERT),
 	{nullptr,0,nullptr},
 	OPTION(USAGE),
 	OPTION(VERSION)

tmp

@@ -0,0 +1,34 @@
+😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸
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+😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸
+😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸
+😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸
+😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸😸
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