Semantic Versioning : Create automatically a tag from specific naming Pull Request

release_tagging.bash

#!/bin/bash


#get highest tag number
VERSION=` describe --abbrev=0 --tags`

#replace . with space so can split into an array
VERSION_BITS=(${VERSION//./ })

#get number parts and increase last one by 1
MAJOR=${VERSION_BITS[0]}
MINOR=${VERSION_BITS[1]}
PATCH=${VERSION_BITS[2]}


if git log -1 --pretty=%B |  -Fxq "[MAJOR]"
then
    MAJOR=$((MAJOR+1))
elif git log -1 --pretty=%B | grep -Fxq "[MINOR]"
then
    MINOR=$((MINOR+1))
elif git log -1 --pretty=%B | grep -Fxq "[PATCH]"
then
    PATCH=$((PATCH+1))
    
else
     MINOR=$((MINOR+1))
fi

#create new tag
NEW_TAG="$MAJOR.$MINOR.$PATCH"

echo "Updating $VERSION to $NEW_TAG"

#get current  and see if it already has a tag
GIT_COMMIT=`git rev-parse HEAD`
NEEDS_TAG=`git describe --contains $GIT_COMMIT`

#only tag if no tag already (would be better if the git describe command above could have a silent option)
if [ -z "$NEEDS_TAG" ]; then
    echo "Tagged with $NEW_TAG (Ignoring fatal:cannot describe - this means commit is untagged) "
    echo "git tag $NEW_TAG"
   # git push --tags
else
    echo "Already a tag on this commit"
fi

Use specific name for Pull Request :

[MAJOR] TITLE PULL REQUEST --> Increment first digit 1.0.0
[MINOR] TITLE PULL REQUEST --> Increment second digit 1.1.0
[PATCH] TITLE PULL REQUEST --> Increment third digit 1.1.1