Add {PLUS_NUM} string code which includes leading + for positive values

src/strings.cpp

@@ -1317,6 +1317,15 @@ static char *FormatString(char *buff, const char *str_arg, StringParameters *arg
 				buff = FormatNoCommaNumber(buff, args->GetInt64(SCC_NUM), last);
 				break;
 
+			case SCC_PLUS_NUM: { // {PLUS_NUM}
+				int64 num = args->GetInt64(SCC_PLUS_NUM);
+				if (num > 0) {
+					buff += seprintf(buff, last, "+");
+				}
+				buff = FormatNoCommaNumber(buff, num, last);
+				break;
+			}
+
 			case SCC_ZEROFILL_NUM: { // {ZEROFILL_NUM}
 				int64 num = args->GetInt64();
 				buff = FormatZerofillNumber(buff, num, args->GetInt64(), last);

src/table/control_codes.h

@@ -96,6 +96,7 @@ enum StringControlCode {
 	SCC_DECIMAL,
 	SCC_DECIMAL1,
 	SCC_NUM,
+	SCC_PLUS_NUM,
 	SCC_ZEROFILL_NUM,
 	SCC_HEX,
 	SCC_BYTES,

src/table/strgen_tables.h

@@ -111,6 +111,7 @@ static const CmdStruct _cmd_structs[] = {
 	{"DECIMAL",           EmitSingleChar, SCC_DECIMAL,            2,  0, C_NONE}, // Number with comma and fractional part. Second parameter is number of fractional digits, first parameter is number times 10**(second parameter).
 	{"DECIMAL1",          EmitSingleChar, SCC_DECIMAL1,           1,  0, C_NONE}, // Decimal with fixed second parameter of 1
 	{"NUM",               EmitSingleChar, SCC_NUM,                1,  0, C_NONE}, // Signed number
+	{"PLUS_NUM",          EmitSingleChar, SCC_PLUS_NUM,           1,  0, C_NONE}, // Signed number, with sign (+ or -) shown for both positive and negative numbers
 	{"ZEROFILL_NUM",      EmitSingleChar, SCC_ZEROFILL_NUM,       2,  0, C_NONE}, // Unsigned number with zero fill, e.g. "02". First parameter is number, second minimum length
 	{"BYTES",             EmitSingleChar, SCC_BYTES,              1,  0, C_NONE}, // Unsigned number with "bytes", i.e. "1.02 MiB or 123 KiB"
 	{"HEX",               EmitSingleChar, SCC_HEX,                1,  0, C_NONE}, // Hexadecimally printed number