myshellconfig/bin/git-submodule-remove

#!/bin/bash

SUBMODULE=$1
logdebug "Check if entry for submodule exist in .git/config and .gitmodules"
[[ $(git config --file=.gitmodules --get submodule.${SUBMODULE}.url >/dev/null 2>&1; echo $?) -eq 0 \
    || $(git config --file=.gitmodules --get submodule.${SUBMODULE}.path >/dev/null 2>&1; echo $?) -eq 0 \
    || $(git config --get submodule.${SUBMODULE}.url >/dev/null 2>&1; echo $?) -eq 0 \
    || $(git config --get submodule.${SUBMODULE}.path >/dev/null 2>&1; echo $?) -eq 0 ]] || exit $?
#
logdebug "Remove entry for submodule from .gitmodules, if exist"
[[ $(git config --file=.gitmodules --get submodule.${SUBMODULE}.url >/dev/null 2>&1; echo $?) -eq 0 \
    || $(git config --file=.gitmodules --get submodule.${SUBMODULE}.path >/dev/null 2>&1; echo $?) -eq 0 ]] && \
    loginfo "$(git config --file=.gitmodules --remove-section submodule.${SUBMODULE})"

loginfo "$(git commit .gitmodules -m 'remove submodule-entry for '"$SUBMODULE"' from .gitconfig')"
logdebug "Remove entry for submodule from .git/confi, if exist"
[[ $(git config --get submodule.${SUBMODULE}.url >/dev/null 2>&1; echo $?) -eq 0 \
    || $(git config --get submodule.${SUBMODULE}.path >/dev/null 2>&1; echo $?) -eq 0 ]] && \
    loginfo "$(git config --remove-section submodule.${SUBMODULE})"

logdebug "Remove submodule from stage"
loginfo "$(git rm --cached "${SUBMODULE}")"

logdebug "Remove submodule from unstaged .git/modules/*"
[ -d ".git/modules/${SUBMODULE}" ] && loginfo "$(rm -rf .git/modules/"${SUBMODULE}")"

loginfo "$(git commit -m "remove submodule ${SUBMODULE}" )"

logdebug "remove submodule from repo"
[ -d "${SUBMODULE}" ] && loginfo "$(rm -rf ${SUBMODULE} )"
loginfo "submodule $SUBMODULE completely removed"