While we're user input in git flow init, ask the user for all prefix

conventions, too.

git-flow-init

@@ -46,6 +46,7 @@ cmd_default() {
 	fi
 
 	local branch_count
+	local answer
 
 	# add a master branch if no such branch exists yet
 	local master_branch
@@ -176,8 +177,46 @@ cmd_default() {
 		git checkout -q "$develop_branch"
 	fi
 
-	# TODO: finally, ask the user for naming convention preferences
-	# i.e. tag prefixes, prefixes for supporting branches, etc.
+	# finally, ask the user for naming conventions (branch and tag prefixes)
+	echo
+	echo "How to name your supporting branch prefixes?"
+
+	local prefix
+
+	# Feature branches
+	default_suggestion=$(git config --get gitflow.prefix.feature || echo feature/)
+	echo "Feature branches? [$default_suggestion] \c"
+	read answer
+	prefix=${answer:-$default_suggestion}
+	git config gitflow.prefix.feature "$prefix"
+
+	# Release branches
+	default_suggestion=$(git config --get gitflow.prefix.release || echo release/)
+	echo "Release branches? [$default_suggestion] \c"
+	read answer
+	prefix=${answer:-$default_suggestion}
+	git config gitflow.prefix.release "$prefix"
+
+	# Hotfix branches
+	default_suggestion=$(git config --get gitflow.prefix.hotfix || echo hotfix/)
+	echo "Hotfix branches? [$default_suggestion] \c"
+	read answer
+	prefix=${answer:-$default_suggestion}
+	git config gitflow.prefix.hotfix "$prefix"
+
+	# Support branches
+	default_suggestion=$(git config --get gitflow.prefix.support || echo support/)
+	echo "Support branches? [$default_suggestion] \c"
+	read answer
+	prefix=${answer:-$default_suggestion}
+	git config gitflow.prefix.support "$prefix"
+
+	# Version tag prefix
+	default_suggestion=$(git config --get gitflow.prefix.versiontag || echo "")
+	echo "Version tag prefix? [$default_suggestion] \c"
+	read answer
+	prefix=${answer:-$default_suggestion}
+	git config gitflow.prefix.versiontag "$prefix"
 
 	# TODO: what to do with origin?
 }