Some minor polish from tourist branch (#949)

- Replace per-type fmt::formatter specializations (StringBuilderBase, NiceBase) with a single generic formatter using a HasStringViewConversion concept
- Add ThousandsNum for comma-separated integer formatting (e.g. "1,234,567")
- Thread naming now accepts a sort hint for trace ordering
- Fix main thread trace registration to use actual thread ID and sort first
- Add ExpandEnvironmentVariables() for expanding %VAR% references in strings, with tests
- Add ParseHexBytes() overload with expected byte count validation
- Add Flag_BelowNormalPriority to CreateProcOptions (BELOW_NORMAL_PRIORITY_CLASS on Windows, setpriority on POSIX)
- Add PrettyScroll progress bar mode that pins the status line to the bottom of the terminal using scroll regions, with signal handler cleanup for Ctrl+C/SIGTERM

1 files changed, 19 insertions, 0 deletions

diff --git a/src/zencore/process.cpp b/src/zencore/process.cpp
index ee821944a..aa41c82ff 100644
--- a/src/zencore/process.cpp
+++ b/src/zencore/process.cpp
@@ -28,6 +28,7 @@ ZEN_THIRD_PARTY_INCLUDES_START
 #	include <pthread.h>
 #	include <signal.h>
 #	include <sys/file.h>
+#	include <sys/resource.h>
 #	include <sys/sem.h>
 #	include <sys/stat.h>
 #	include <sys/syscall.h>
@@ -833,6 +834,10 @@ CreateProcNormal(const std::filesystem::path& Executable, std::string_view Comma
 	{
 		CreationFlags |= CREATE_NEW_PROCESS_GROUP;
 	}
+	if (Options.Flags & CreateProcOptions::Flag_BelowNormalPriority)
+	{
+		CreationFlags |= BELOW_NORMAL_PRIORITY_CLASS;
+	}
 	if (AssignToJob)
 	{
 		CreationFlags |= CREATE_SUSPENDED;
@@ -1043,6 +1048,10 @@ CreateProcUnelevated(const std::filesystem::path& Executable, std::string_view C
 	{
 		CreateProcFlags |= CREATE_NO_WINDOW;
 	}
+	if (Options.Flags & CreateProcOptions::Flag_BelowNormalPriority)
+	{
+		CreateProcFlags |= BELOW_NORMAL_PRIORITY_CLASS;
+	}
 	if (AssignToJob)
 	{
 		CreateProcFlags |= CREATE_SUSPENDED;
@@ -1201,6 +1210,11 @@ CreateProc(const std::filesystem::path& Executable, std::string_view CommandLine
 		_exit(127);
 	}
 
+	if (Options.Flags & CreateProcOptions::Flag_BelowNormalPriority)
+	{
+		setpriority(PRIO_PROCESS, ChildPid, 5);
+	}
+
 	return ChildPid;
 #else  // macOS
 	std::vector<char*> ArgV;
@@ -1280,6 +1294,11 @@ CreateProc(const std::filesystem::path& Executable, std::string_view CommandLine
 		ThrowSystemError(Err, "Failed to posix_spawn a new child process");
 	}
 
+	if (Options.Flags & CreateProcOptions::Flag_BelowNormalPriority)
+	{
+		setpriority(PRIO_PROCESS, ChildPid, 5);
+	}
+
 	return int(ChildPid);
 #endif
 }