show version in cli and web

_do_bump_version

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+# safety checks
+if [[ $# -ne 1 ]]; then
+    echo "usage: $0 <major|minor|patch>" >&2
+    exit 1
+fi
+if [[ -n "$(git status --porcelain)" ]]; then
+    echo "working directory is dirty" >&2
+    exit 1
+fi
+
+# get the current verison from last git tag into array and
+# inc the provided part
+semver_expression='s/^v([0-9]+)\.([0-9]+)\.([0-9]+).*$/\1 \2 \3/'
+version=( $(git describe --tags | sed -E -e "$semver_expression" ) )
+case "$1" in
+    major)
+        ((version[0]++))
+	version[1]=0
+	version[2]=0
+        ;;
+    minor)
+        ((version[1]++))
+	version[2]=0
+        ;;
+    patch)
+        ((version[2]++))
+        ;;
+    *)
+        echo 'please provide a valid version in increment' >&2
+        exit 1
+esac
+new_version="v${version[0]}.${version[1]}.${version[2]}"
+
+# write version to go
+mkdir version >/dev/null 2>&1
+cat > version/version.go  << EOL
+// generated by \`_do_bump_version\` script in project root
+// $(date)
+// DO NOT EDIT
+
+package version
+
+const VERSION = "$new_version"
+EOL
+
+# create and tag single commit with a change to the version file
+git commit --all --message "bump to $new_version"
+git tag "$new_version"