From ece854564a8f51c3f1afad4abd18120cadb4ef6e Mon Sep 17 00:00:00 2001
From: David Maas <contact@pathogenstudios.com>
Date: Mon, 22 Feb 2021 04:58:51 -0600
Subject: [PATCH] Log/Capture: Added LogTextV, a va_list variant of LogText.
 (#3828)

---
 docs/CHANGELOG.txt |  1 +
 imgui.cpp          | 28 +++++++++++++++++++++-------
 imgui.h            |  1 +
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 432976a24..785369990 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -59,6 +59,7 @@ Other Changes:
 - Examples: Reworked setup of clear color to be compatible with transparent values.
 - CI: Use a dedicated "scheduled" workflow to trigger scheduled builds. Forks may disable this workflow if
   scheduled builds builds are not required. [@rokups]
+- Log/Capture: Added LogTextV, a va_list variant of LogText. [@PathogenDavid]
 
 
 -----------------------------------------------------------------------
diff --git a/imgui.cpp b/imgui.cpp
index dfba47e33..80b004409 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -9911,14 +9911,8 @@ void ImGui::EndDragDropTarget()
 //-----------------------------------------------------------------------------
 
 // Pass text data straight to log (without being displayed)
-void ImGui::LogText(const char* fmt, ...)
+static inline void LogTextV(ImGuiContext& g, const char* fmt, va_list args)
 {
-    ImGuiContext& g = *GImGui;
-    if (!g.LogEnabled)
-        return;
-
-    va_list args;
-    va_start(args, fmt);
     if (g.LogFile)
     {
         g.LogBuffer.Buf.resize(0);
@@ -9929,9 +9923,29 @@ void ImGui::LogText(const char* fmt, ...)
     {
         g.LogBuffer.appendfv(fmt, args);
     }
+}
+
+void ImGui::LogText(const char* fmt, ...)
+{
+    ImGuiContext& g = *GImGui;
+    if (!g.LogEnabled)
+        return;
+
+    va_list args;
+    va_start(args, fmt);
+    LogTextV(g, fmt, args);
     va_end(args);
 }
 
+void ImGui::LogTextV(const char* fmt, va_list args)
+{
+    ImGuiContext& g = *GImGui;
+    if (!g.LogEnabled)
+        return;
+
+    LogTextV(g, fmt, args);
+}
+
 // Internal version that takes a position to decide on newline placement and pad items according to their depth.
 // We split text into individual lines to add current tree level padding
 // FIXME: This code is a little complicated perhaps, considering simplifying the whole system.
diff --git a/imgui.h b/imgui.h
index db4247213..be95aaca7 100644
--- a/imgui.h
+++ b/imgui.h
@@ -748,6 +748,7 @@ namespace ImGui
     IMGUI_API void          LogFinish();                                                        // stop logging (close file, etc.)
     IMGUI_API void          LogButtons();                                                       // helper to display buttons for logging to tty/file/clipboard
     IMGUI_API void          LogText(const char* fmt, ...) IM_FMTARGS(1);                        // pass text data straight to log (without being displayed)
+    IMGUI_API void          LogTextV(const char* fmt, va_list args) IM_FMTLIST(1);
 
     // Drag and Drop
     // - If you stop calling BeginDragDropSource() the payload is preserved however it won't have a preview tooltip (we currently display a fallback "..." tooltip as replacement)