simplify git issue import functionality

allow git issue import to work without arguments for origin repo
but also allow you to define the remote if 1 arguement is present

lib/git-issue/import-export.sh

@@ -6,7 +6,7 @@
 usage_import()
 {
   cat <<\USAGE_import_EOF
-gi import usage: git issue import provider user repo
+gi import usage: git issue import [remote | provider [user [repo]]]
 Example: git issue import github torvalds linux
 USAGE_import_EOF
   exit 2
@@ -878,16 +878,59 @@ t again
 ' "$1"-header
 }
 
+# Returns the git's repository URL
+get_url()
+{
+  local remote=$1
+
+  if [ -z "${remote}" ]
+  then
+    remote="origin"
+  fi
+
+  local url provider user repo
+  url=$(git remote get-url ${remote} 2>&1)
+
+  if [ "${url}" = "fatal: No such remote '${remote}'" ]
+  then
+    printf "%s\n\n" "${url}"
+    usage_import
+  fi
+  echo "${url}"
+}
+
+# Returns the git's repository provider name from the URL
+get_provider()
+{
+  echo "$1" | sed "s|^git@||; s|^https://||; s|/[a-z]*||; s|.com.*||"
+}
+# Returns the git's repository user name from the URL
+get_user()
+{
+  echo "$1" | sed -E "s/.*\.com[:|/]([^/]*).*/\1/"
+}
+# Returns the git's repository repo name from the URL
+get_repo()
+{
+  echo "$1" | sed -E "s/.*\.com[:|/].*\/([^.]*).git/\1/"
+}
+
 # Import issues from specified source (currently github and gitlab)
 sub_import()
 {
-  local endpoint user repo begin_sha provider
+  local endpoint user repo begin_sha provider url
 
-  test "$1" = github -o "$1" = gitlab -a -n "$2" -a -n "$3" || usage_import
-  provider="$1"
-  # convert to lowercase to avoid duplicates
-  user="$(echo "$2" | tr '[:upper:]' '[:lower:]')"
-  repo="$(echo "$3" | tr '[:upper:]' '[:lower:]')"
+  test "$1" = github -o "$1" = gitlab -a -n "$2" -a -n "$3" ||
+    url=$(get_url "$1"); provider=$(get_provider "${url}"); user=$(get_user "${url}"); repo=$(get_repo "${url}")
+
+  if ! test -n "${provider}" && ! test -n "${user}" && ! test -n "${repo}"
+  then
+    provider="$1"
+
+    # convert to lowercase to avoid duplicates
+    user="$(echo "$2" | tr '[:upper:]' '[:lower:]')"
+    repo="$(echo "$3" | tr '[:upper:]' '[:lower:]')"
+  fi
 
   cdissues