Add new scripts for creating snapshots and releases.

The old MAKE_SNAPSHOT.sh and MAKE_RELEASE.sh scripts created tarballs
that could be uploaded to icarus.com and SourceForge. Now we release
on GitHub, we need to make all the necessary changes in the git
repository, temporarily creating a release_tag.h file and deleting it
after we have created the snapshot or release tag. This allows GitHub
to automatically generate the tarballs for us.

scripts/CREATE_RELEASE.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# This script prepares and tags a release in the git repository. The tag is
+# based on the first and second argument passed to the script, which should
+# be the desired major and minor numbers for the release. Before creating
+# the tag, the version_base.h and verilog.spec files will be updated to
+# reflect the new release ID and a release_tag.h file will be created in
+# the top level directory to provide the VERSION_TAG macro. After creating
+# the tag, the release_tag.h file will be deleted.
+#
+# The complete steps to publish a release are:
+#
+#   sh scripts/CREATE_RELEASE.sh
+#                 (Create the tag and version info in the local repository)
+#
+#   git push --follow-tags
+#                 (Push the commits and tag to the remote repository.)
+#
+# For a major release, create and switch to the new release branch before
+# running this script.
+
+if [ $# -ne 2 ] ; then
+    echo "Usage: CREATE_RELEASE.sh <major-number> <minor-number>"
+    exit 1;
+fi
+case $1 in
+  *[!0-9]*) echo "Major number must be numeric"; exit 1;;
+esac
+case $2 in
+  *[!0-9]*) echo "Minor number must be numeric"; exit 1;;
+esac
+
+major=$1
+minor=$2
+
+date=`date +%Y%m%d`
+
+tag="v${major}_${minor}"
+
+tag_exists=`git tag -l $tag`
+if [ -n "$tag_exists" ] ; then
+    echo "The tag $tag already exists. Aborting"
+    exit 1
+fi
+
+echo "Updating version_base.h..."
+sed -i -E "s/(define\s+VERSION_MAJOR\s+).*/\1$major/" version_base.h
+sed -i -E "s/(define\s+VERSION_MINOR\s+).*/\1$minor/" version_base.h
+sed -i -E "s/(define\s+VERSION_EXTRA\s+).*/\1\" \(stable\)\"/" version_base.h
+
+echo "Updating verilog.spec..."
+sed -i -E "s/(define\s+major\s+).*/\1$major/" verilog.spec
+sed -i -E "s/(define\s+minor\s+).*/\1$minor/" verilog.spec
+sed -i -E "s/(define\s+rev_date\s+).*/\1$date/" verilog.spec
+
+echo "Creating release_tag.h..."
+echo "#define VERSION_TAG \"$tag\"" > release_tag.h
+
+echo "Adding files and creating the tag..."
+git add version_base.h verilog.spec release_tag.h
+git commit -m "Creating release $tag"
+git tag -a -m "Release $major.$minor" $tag
+
+echo "Deleting release_tag.h..."
+git rm release_tag.h
+git commit -m "Post-release cleanup"
+
+echo "Done"

scripts/CREATE_SNAPSHOT.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# This script prepares and tags a snapshot in the git repository. The tag is
+# based on the current date, e.g. when created on 03-Jan-2025 the tag will be
+# s20250103. Before creating the tag, the verilog.spec file will be updated
+# to reflect the snapshot date and a release_tag.h file will be created in
+# the top level directory to provide the VERSION_TAG macro. After creating
+# the tag, the release_tag.h file will be deleted.
+#
+# The complete steps to publish a snapshot are:
+#
+#   sh scripts/CREATE_SNAPSHOT.sh
+#                 (Create the tag and version info in the local repository)
+#
+#   git push --follow-tags
+#                 (Push the commits and tag to the remote repository.)
+
+date=`date +%Y%m%d`
+
+tag="s$date"
+
+tag_exists=`git tag -l $tag`
+if [ -n "$tag_exists" ] ; then
+    echo "The tag $tag already exists. Aborting"
+    exit 1
+fi
+
+echo "Updating verilog.spec..."
+sed -i -E "s/(define\s+rev_date\s+).*/\1$date/" verilog.spec
+
+echo "Creating release_tag.h..."
+echo "#define VERSION_TAG \"$tag\"" > release_tag.h
+
+echo "Adding modified files and creating the tag..."
+git add verilog.spec release_tag.h
+git commit -m "Creating snapshot $tag"
+git tag -a -m "Snapshot $id" $tag
+
+echo "Deleting release_tag.h..."
+git rm release_tag.h
+git commit -m "Post-snapshot cleanup"
+
+echo "Done"