Fix reported version, add 'make distcheck', and add metainfo.xml file.

Missed changing 3.0.2 to 3.0.3 in file fix-ca.c earlier. Now this is
updated automaticaly since info is fetched from fix-ca-config.h file.

Added 'Directional' to X and Y axis to help clarify controls.

Added ./configure --debugtime option. Run gimp in commamdline to see.

make distcheck ran into problems that adding into the plugin directory
is not possible as a user since the directory belongs to gimp, not to
this project. found a workaround by only writing to directory if user
is 'root' (example: sudo make install). Meanwhile, as a normal user
the bindir and file are not created/installed so that distcheck works.

Added metainfo.xml based on using template example for:
org.gimp.extension.goat-exercises.metainfo.xml.in.in
Tested and appears okay with:
appstream-util validate-relax org.gimp.extension.fix-ca.metainfo.xml

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        choiceL: [--disable-silent-rules, --enable-silent-rules]
+        choiceL: [--disable-silent-rules, --enable-silent-rules --enable-debugtime]
     steps:
       - uses: actions/checkout@v2
       - name: Create configure
@@ -32,3 +32,6 @@ jobs:
         run: |
           sudo make install
           sudo make uninstall
+      - name: Test make distcheck
+        if: matrix.choiceL == '--disable-silent-rules'
+        run: make distcheck

Makefile.am

@@ -8,27 +8,35 @@ AM_CFLAGS = ${CFLAGS} ${CPPFLAGS} ${GIMP_CFLAGS}
 AM_CPPFLAGS = -I${builddir} -I${srcdir} @GIMP_CFLAGS@ -I${includedir}
 
 bin_PROGRAMS = fix-ca
-bindir = ${GIMP_LIBDIR}/plug-ins
+# 'make distcheck' can't write to ${GIMP_LIBDIR}/plug-ins/fix-ca because of
+# directory permissions, therefore don't install fix-ca unless it is root
+@SNIPPET@
 
+fix_ca_name   = fix-ca
 fix_ca_SOURCES = fix-ca.c
 fix_ca.$(OBJEXT): fix-ca-config.h
 fix_ca_LDADD = ${LIBS} ${GIMP_LIBS}
 
+metainfodir = ${datarootdir}/metainfo
+metainfo_DATA = ${srcdir}/org.gimp.extension.fix-ca.metainfo.xml
+
 EXTRA_DIST = README.md fix-ca-config.h.in rpm/gimp-fix-ca.spec.in \
 	img-fix-ca/ex-fixed.jpg img-fix-ca/ex-orig.jpg img-fix-ca/ex-zoom.jpg	\
 	img-fix-ca/fix-ca-dialog.png img-fix-ca/full-Wat_Pathum_Wanaram.jpg	\
 	img-fix-ca/plug-in-browser.png img-fix-ca/Sea_turtle-dialog_before.png	\
 	img-fix-ca/Sea_turtle-dialog.png img-fix-ca/Sea_turtle-fixed.jpg	\
-	img-fix-ca/Sea_turtle-orig.jpg img-fix-ca/Sea_turtle-zoom.jpg
+	img-fix-ca/Sea_turtle-orig.jpg img-fix-ca/Sea_turtle-zoom.jpg		\
+	org.gimp.extension.fix-ca.metainfo.xml
 nodist_EXTRA_DATA = .git .github
-DISTCHECK_CONFIGURE_FLAGS = --disable-silent-rules
+DISTCHECK_CONFIGURE_FLAGS = --disable-silent-rules --enable-debugtime
 
 strip:
-	${STRIP} ${builddir}/fix-ca
+	${STRIP} ${builddir}/${fix_ca_name}
 
 # These use gimptool to install/uninstall fix-ca in user directory
+# NOTE: gimptool installs fix-ca directly into the plugin directory
 install-user:
-	${GIMPTOOL} --install-bin ${builddir}/fix-ca
+	${GIMPTOOL} --install-bin ${builddir}/${fix_ca_name}
 
 uninstall-user:
-	${GIMPTOOL} --uninstall-bin fix-ca
+	${GIMPTOOL} --uninstall-bin ${fix_ca_name}

configure.ac

@@ -90,6 +90,16 @@ AC_SUBST(GIMP_DATADIR)
 
 AM_CONDITIONAL([HAVEGIMPTOOL],[test "${GIMPTOOL}"x != x])
 
+#--------------------------------------------------------------------------
+# Enable debug_time mode
+AC_ARG_ENABLE([debugtime],
+  [AS_HELP_STRING([--enable-debugtime],
+    [Enable debugging time printf mode on commandline @<:@default=no@:>@])],
+  [],[enable_debugtime=no])
+if test "x$enable_debugtime" = xyes || test "x$enable_debugtime" = xtrue ; then
+  AC_DEFINE([DEBUG_TIME],1,[Define if debugging time using printf.])
+fi
+
 #--------------------------------------------------------------------------
 # Pass variables to fix-ca-config.h
 AC_DEFINE([FIX_CA_MAJOR_VERSION],["fix_ca_major_version"],[gimp-fix-ca-plugin major version])
@@ -104,6 +114,18 @@ AC_SUBST([FIX_CA_VERSION],[fix_ca_version])
 AC_SUBST([FIX_CA_PACKAGE_NAME],[fix_ca_package_name])
 AC_SUBST([HOST],["$host"])
 
+dnl Do this here since automake can't process 'if/else/endif in Makefile.am
+SNIPPET='
+noinst_PROGRAMS =
+ifeq ($(shell id -u),0)
+  bindir = $(GIMP_LIBDIR)/plug-ins/fix-ca
+else
+  noinst_PROGRAMS += fix-ca
+endif
+'
+AC_SUBST([SNIPPET])
+AM_SUBST_NOTMAKE([SNIPPET])
+
 #--------------------------------------------------------------------------
 # Put ifndef wrapper on fix-ca-config.h so we don't call it repeatedly.
 AH_TOP([#ifndef FIX_CA_CONFIG_H

fix-ca.c

@@ -19,6 +19,7 @@
 */
 
 #define _ISOC99_SOURCE
+#include "fix-ca-config.h"
 #include <string.h>
 #include <math.h>
 
@@ -123,8 +124,9 @@ void	query (void)
 		{ GIMP_PDB_FLOAT, "y_red", "Red amount (y axis)" }
 	};
 
+#define FIX_CA_VERSION "Fix-CA Version " FIX_CA_MAJOR_VERSION "." FIX_CA_MINOR_VERSION
 	gimp_install_procedure (PROCEDURE_NAME,
-				"Fix-CA Version 3.0.2",
+				FIX_CA_VERSION,
 				"Fix chromatic aberration caused by imperfect "
 				"lens.  It works by shifting red and blue "
 				"components of image pixels in the specified "
@@ -376,7 +378,7 @@ gboolean	fix_ca_dialog (GimpDrawable *drawable, FixCaParams *params)
 			  G_CALLBACK (gimp_preview_invalidate),
 			  preview);
 
-	frame = gimp_frame_new ("X axis");
+	frame = gimp_frame_new ("Directional, X axis");
 	gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
 	gtk_widget_show (frame);
 
@@ -412,7 +414,7 @@ gboolean	fix_ca_dialog (GimpDrawable *drawable, FixCaParams *params)
 			  G_CALLBACK (gimp_preview_invalidate),
 			  preview);
 
-	frame = gimp_frame_new ("Y axis");
+	frame = gimp_frame_new ("Directional, Y axis");
 	gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
 	gtk_widget_show (frame);
 
@@ -995,7 +997,7 @@ void	fix_ca_region (GimpDrawable *drawable,
 	gettimeofday (&tv2, NULL);
 
 	sec = tv2.tv_sec - tv1.tv_sec + (tv2.tv_usec - tv1.tv_usec)/1000000.0;
-	printf ("Elapsed time: %.2f\n", sec);
+	printf ("fix-ca Elapsed time: %.2f\n", sec);
 #endif
 }
 

org.gimp.extension.fix-ca.metainfo.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2023 Joe Da Silva <digital@joescat.com> -->
+<component type="addon">
+  <id>org.gimp.extension.fix-ca</id>
+  <extends>org.gimp.GIMP</extends>
+  <name>Fix Chromatic Aberration</name>
+  <summary>[plug-in to correct Lateral or Directional Chromatic Aberration (CA)]</summary>
+  <description>
+    <p>
+    This extension helps the user correct Lateral Chromatic Aberration (CA) due
+    to different color wavelengths travelling through a lens, or Directional CA,
+    where the amount of CA is assumed to be the same throughout the image due to
+    light travelling through dense material such as glass or water.
+    </p>
+  </description>
+  <url type="homepage">https://github.com/JoesCat/gimp-fix-ca</url>
+  <url type="help">https://github.com/JoesCat/gimp-fix-ca#readme</url>
+  <url type="bugtracker">https://github.com/JoesCat/gimp-fix-ca/issues</url>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0+</project_license>
+  <releases>
+   <release version="3.0.3" date="2022-10-09" />
+  </releases>
+  <requires>
+   <id version="2.4" compare="ge">org.gimp.GIMP</id>
+  </requires>
+  <metadata>
+   <value key="GIMP::plug-in-path">fix-ca</value>
+  </metadata>
+</component>