[gucharmap] build: Add dist script

[Christian Persch <chpe src gnome org>]

commit b77d4df7d0e64f09d6b4044c0934d3f90c832529
Author: Christian Persch <chpe src gnome org>
Date:   Fri Mar 19 23:01:33 2021 +0100

    build: Add dist script

 Makefile.meson     |  8 ++++++++
 meson.build        |  6 ++++++
 meson_changelog.sh | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)
---
diff --git a/Makefile.meson b/Makefile.meson
index 4e92f6f8..0a65935e 100644
--- a/Makefile.meson
+++ b/Makefile.meson
@@ -22,6 +22,8 @@ NTHREADS = 1
 NJOBS = -j$(NTHREADS)
 NINJA = ninja $(NJOBS)
 
+MESON = meson
+
 #
 
 all:
@@ -41,3 +43,9 @@ install:
 
 uninstall:
        $(NINJA) uninstall
+
+dist:
+       $(MESON) dist --no-tests
+
+distcheck:
+       $(MESON) dist
diff --git a/meson.build b/meson.build
index a24127d7..c98aa0cf 100644
--- a/meson.build
+++ b/meson.build
@@ -264,6 +264,12 @@ if get_option('docs') and get_option('charmap')
   subdir('help')
 endif
 
+# Dist
+
+meson.add_dist_script(
+  find_program('meson_changelog.sh'),
+)
+
 # Simple compat Makefile
 
 makefile_conf = configuration_data()
diff --git a/meson_changelog.sh b/meson_changelog.sh
new file mode 100755
index 00000000..6e4cad0e
--- /dev/null
+++ b/meson_changelog.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Copyright © 2021 Christian Persch
+#
+# This programme is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at your
+# option) any later version.
+#
+# This programme is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this programme.  If not, see <https://www.gnu.org/licenses/>.
+
+set -e
+
+top_srcdir="$MESON_SOURCE_ROOT"
+top_builddir="MESON_BUILD_ROOT"
+top_distdir="$MESON_DIST_ROOT"
+
+if ! test -e "${top_srcdir}"/.git; then
+    echo "Must be run from gnome-terminal git checkout"
+    exit 1
+fi
+
+if ! test -e "${top_distdir}"; then
+    echo "Must be run from 'meson dist'"
+    exit 1
+fi
+
+GIT_DIR="${top_srcdir}"/.git git log --stat > "${top_distdir}"/ChangeLog