From f9da4640c4098107aefc6c02b12b543384cccc50 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Date: Thu, 30 Apr 2026 09:35:03 +0300
Subject: Drop libfmt

We can use std::format() and a custom print() wrapper with C++20. When
moving to C++23, we can drop the wrapper.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 .github/workflows/c-cpp.yml |  2 +-
 kms++/inc/kms++/format.h    | 28 ++++++++++++++++++++++++++++
 kms++/meson.build           |  2 +-
 kms++/src/videomode.cpp     |  2 +-
 kms++util/meson.build       |  2 +-
 kms++util/src/testpat.cpp   |  1 -
 kmscube/meson.build         |  2 +-
 meson.build                 |  2 --
 utils/kmsprint.cpp          |  2 +-
 utils/kmstest.cpp           |  2 +-
 utils/meson.build           |  2 +-
 11 files changed, 36 insertions(+), 11 deletions(-)
 create mode 100644 kms++/inc/kms++/format.h

diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index eccafb2..c900386 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -52,7 +52,7 @@ jobs:
     - name: install deps
       run: |
         sudo apt install -y libdrm-dev libegl1-mesa-dev libgles2-mesa-dev libwayland-dev \
-          libx11-xcb-dev libx11-dev libgbm-dev libevdev-dev libfmt-dev
+          libx11-xcb-dev libx11-dev libgbm-dev libevdev-dev
 
     - name: configure
       env:
diff --git a/kms++/inc/kms++/format.h b/kms++/inc/kms++/format.h
new file mode 100644
index 0000000..b48babe
--- /dev/null
+++ b/kms++/inc/kms++/format.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cstdio>
+#include <format>
+#include <string>
+
+// This can be removed when moving to C++23. For now, this gives us
+// fmt::format() and fmt::print().
+
+namespace fmt {
+
+using std::format;
+
+template<typename... Args>
+void print(std::format_string<Args...> fmtstr, Args&&... args)
+{
+	std::string s = std::format(fmtstr, std::forward<Args>(args)...);
+	std::fwrite(s.data(), 1, s.size(), stdout);
+}
+
+template<typename... Args>
+void print(std::FILE* f, std::format_string<Args...> fmtstr, Args&&... args)
+{
+	std::string s = std::format(fmtstr, std::forward<Args>(args)...);
+	std::fwrite(s.data(), 1, s.size(), f);
+}
+
+} // namespace fmt
diff --git a/kms++/meson.build b/kms++/meson.build
index cd7a494..4fb5fc9 100644
--- a/kms++/meson.build
+++ b/kms++/meson.build
@@ -68,7 +68,7 @@ else
     omapdrm_enabled = false
 endif
 
-libkmsxx_deps = [ libdrm_dep, libfmt_dep, libdrmomap_dep ]
+libkmsxx_deps = [ libdrm_dep, libdrmomap_dep ]
 
 libkmsxx = library('kms++',
                    libkmsxx_sources,
diff --git a/kms++/src/videomode.cpp b/kms++/src/videomode.cpp
index 4be6de7..b7b1b28 100644
--- a/kms++/src/videomode.cpp
+++ b/kms++/src/videomode.cpp
@@ -2,7 +2,7 @@
 #include <xf86drmMode.h>
 #include <cmath>
 #include <sstream>
-#include <fmt/format.h>
+#include <kms++/format.h>
 
 #include <kms++/kms++.h>
 #include "helpers.h"
diff --git a/kms++util/meson.build b/kms++util/meson.build
index ea998f0..e2beed6 100644
--- a/kms++util/meson.build
+++ b/kms++util/meson.build
@@ -40,7 +40,7 @@ if thread_dep.found()
     libkmsxxutil_args += [ '-DHAS_PTHREAD' ]
 endif
 
-libkmsxxutil_deps = [ libkmsxx_dep, libfmt_dep, thread_dep ]
+libkmsxxutil_deps = [ libkmsxx_dep, thread_dep ]
 
 libkmsxxutil = library('kms++util',
                        libkmsxxutil_sources,
diff --git a/kms++util/src/testpat.cpp b/kms++util/src/testpat.cpp
index fe0988e..e424103 100644
--- a/kms++util/src/testpat.cpp
+++ b/kms++util/src/testpat.cpp
@@ -1,6 +1,5 @@
 
 #include <cstring>
-#include <fmt/format.h>
 #include <functional>
 #include <optional>
 #include <span>
diff --git a/kmscube/meson.build b/kmscube/meson.build
index fd0fb96..c26badc 100644
--- a/kmscube/meson.build
+++ b/kmscube/meson.build
@@ -21,7 +21,7 @@ kmscube_sources = files([
 ])
 
 kmscube_deps = [
-    libdrm_dep, libkmsxx_dep, libkmsxxutil_dep, libfmt_dep,
+    libdrm_dep, libkmsxx_dep, libkmsxxutil_dep,
     dependency('x11'),
     dependency('xcb'),
     dependency('x11-xcb'),
diff --git a/meson.build b/meson.build
index be0b2a1..0a67bdf 100644
--- a/meson.build
+++ b/meson.build
@@ -36,8 +36,6 @@ endif
 
 add_project_arguments(cpp_arguments, language : 'cpp')
 
-libfmt_dep = dependency('fmt')
-
 libdrmomap_dep = dependency('libdrm_omap', required : get_option('omap'))
 
 if libdrmomap_dep.found()
diff --git a/utils/kmsprint.cpp b/utils/kmsprint.cpp
index d8b4219..849c05c 100644
--- a/utils/kmsprint.cpp
+++ b/utils/kmsprint.cpp
@@ -4,7 +4,7 @@
 #include <iostream>
 #include <string>
 #include <unistd.h>
-#include <fmt/format.h>
+#include <kms++/format.h>
 
 #include <kms++/kms++.h>
 #include <kms++util/kms++util.h>
diff --git a/utils/kmstest.cpp b/utils/kmstest.cpp
index 76b64ca..40143c3 100644
--- a/utils/kmstest.cpp
+++ b/utils/kmstest.cpp
@@ -9,7 +9,7 @@
 
 #include <sys/select.h>
 
-#include <fmt/format.h>
+#include <kms++/format.h>
 
 #include <kms++/kms++.h>
 #include <kms++/modedb.h>
diff --git a/utils/meson.build b/utils/meson.build
index b1d3082..54021d3 100644
--- a/utils/meson.build
+++ b/utils/meson.build
@@ -10,7 +10,7 @@ endif
 
 utils_enabled = true
 
-common_deps = [ libkmsxx_dep, libkmsxxutil_dep, libfmt_dep ]
+common_deps = [ libkmsxx_dep, libkmsxxutil_dep ]
 
 libevdev_dep = dependency('libevdev', required : false)
 
-- 
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