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spell.py
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spell.py
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import json
import os
import sys
VERSION = "1.1.0"
BASE_DIR = os.path.dirname(__file__)
BOOK_FILE = os.path.join(BASE_DIR, "book.json")
ALIAS_FILE = os.path.join(BASE_DIR, "book.alias")
# TODO add spell modifiers: resolve values of a group of arguments in a spell, i.e.:
# TODO my > mysql -h {{host}} -u {{user}} -p{{pass}} -e {{command}}
# TODO modifier "local" > {"host": "localhost", "user": "localuser", "pass": "somepassword"}
# TODO modifier "prod" > {"host": "mysql-prod-ip", "user": "produser", "pass": "otherpassword"}
# TODO then you can: my --prod select 1
# TODO good example for usage;
# TODO shfor => for i in {{array}}; do {{command}}; done
# TODO array => a b c
# TODO command => echo $i
# TODO for i in a b c; do echo $i; done
# TODO flag for debugging failing spells (add echos)
def main():
args = sys.argv[1:]
named_args, ordered_args = parse_args(args)
if len(ordered_args) == 0:
op_help("")
elif ordered_args[0] == "help":
op_help(ordered_args[1] if len(ordered_args) > 1 else None)
elif ordered_args[0] == "list":
op_list(ordered_args[1:])
elif ordered_args[0] == "add" and len(ordered_args) > 1:
op_add(ordered_args[1:], named_args)
elif ordered_args[0] == "remove" and len(ordered_args) > 1:
op_remove(ordered_args[1:])
# TODO add import/export from/to json
else:
op_help("")
exit(1)
# # # SPELL CRUD OPERATIONS # # #
def get_hierarchy(tree, name):
if len(name) == 0:
return [tree]
if name[0] in tree["spells"]:
return [tree] + get_hierarchy(tree["spells"][name[0]], name[1:])
return [tree]
def op_list(name):
book = get_book()
hierarchy = get_hierarchy(book, name)
if len(hierarchy) == len(name) + 1:
print_spell(name, hierarchy[-1])
else:
print("Spell not found: {}".format(" ".join(name)))
exit(1)
def op_add(name, args):
command = args["c"] if "c" in args else None
left_delimiter = args["ld"] if "ld" in args else None
right_delimiter = args["rd"] if "rd" in args else None
if command is None:
print("Missing argument: -c <command>")
exit(1)
book = get_book()
hierarchy = get_hierarchy(book, name)
# Create missing spells
while len(hierarchy) < len(name) + 1:
spell = dict()
spell["spells"] = dict()
hierarchy[-1]["spells"][name[len(hierarchy) - 1]] = spell
hierarchy.append(spell)
spell = hierarchy[-1]
spell["command"] = command
if left_delimiter is not None:
spell["left_delimiter"] = left_delimiter
elif "left_delimiter" in spell:
spell.pop("left_delimiter")
if right_delimiter is not None:
spell["right_delimiter"] = right_delimiter
elif "right_delimiter" in spell:
spell.pop("right_delimiter")
update_data_files(book)
def op_remove(name):
book = get_book()
hierarchy = get_hierarchy(book, name)
if len(hierarchy) < len(name):
print("Parent not found: {}".format(" ".join(name[:-1])))
exit(1)
elif len(hierarchy) < len(name) + 1:
print("Spell not found: {}".format(" ".join(name)))
exit(1)
else:
if len(hierarchy[-1]["spells"]) == 0: # If no subspells, just remove it # TODO fix this for deeper empty chains
hierarchy[-2]["spells"].pop(name[-1])
else: # Clean spell fields, but keep subspells
if "command" in hierarchy[-1]:
hierarchy[-1].pop("command")
if "left_delimiter" in hierarchy[-1]:
hierarchy[-1].pop("left_delimiter")
if "right_delimiter" in hierarchy[-1]:
hierarchy[-1].pop("right_delimiter")
update_data_files(book)
def get_book():
book = file_to_json(BOOK_FILE)
if book is None:
book = dict()
book["spells"] = dict()
book["left_delimiter"] = "{"
book["right_delimiter"] = "}"
update_data_files(book)
return book
def update_data_files(book):
json_to_file(book, BOOK_FILE)
string_to_file(get_aliases(book), ALIAS_FILE)
# # # ALIAS GENERATION # # #
def get_aliases(book):
return "\n".join([
get_root_alias(spell, book["spells"][spell], book["left_delimiter"], book["right_delimiter"])
for spell in book["spells"]])
def get_root_alias(name, spell, left_delimiter, right_delimiter):
function_statement = "function {} () {{\n{}\n}}\n"
return function_statement.format(name, get_alias([name], spell, left_delimiter, right_delimiter, 1))
# TODO support commands for non-leaf spells
def get_alias(name, spell, left_delimiter, right_delimiter, depth):
left_delimiter = spell["left_delimiter"] if "left_delimiter" in spell else left_delimiter
right_delimiter = spell["right_delimiter"] if "right_delimiter" in spell else right_delimiter
test_statement = "[ ${} = \"{}\" ]"
if len(spell["spells"]) > 0:
return "\n".join([
get_alias(name + [subspell], spell["spells"][subspell], left_delimiter, right_delimiter, depth + 1)
for subspell in spell["spells"]])
command_statement = "\t"
for arg_index in range(1, len(name)):
command_statement += test_statement.format(arg_index, name[arg_index]) + " && "
return command_statement + get_resolve_statement(spell["command"], left_delimiter, right_delimiter, depth)
def get_resolve_statement(command, left_delimiter, right_delimiter, depth):
return "$(python3 " + BASE_DIR + "/resolve.py \"" + command + "\" \""\
+ left_delimiter + "\" \"" + right_delimiter + "\" \"${@:" + str(depth) + "}\")"
# # # MISC # # #
def parse_args(args):
named_args = dict()
ordered_args = list()
arg_name = None
for arg in args:
if arg.startswith("-"):
arg_name = arg[2:] if arg.startswith("--") else arg[1:]
elif arg_name is not None:
named_args[arg_name] = arg
arg_name = None
else:
ordered_args.append(arg)
return named_args, ordered_args
def print_spell(name, spell):
if "command" in spell:
print(spell_to_string(" ".join(name), spell["command"]))
for subname, subspell in sorted(spell["spells"].items()):
print_spell(name + [subname], subspell)
def spell_to_string(name, command):
return colored_spell_name(name) + ("" if command is None else colored(YELLOW, " => ") + command)
def colored_spell_name(name):
return colored(GREEN, name.split()[0]) + ("" if len(name.split()) == 1 else " " + colored(CYAN, " ".join(name.split()[1:])))
def file_to_json(path):
if os.path.exists(path):
with open(path, 'r') as f:
return json.loads(f.read())
return None
def json_to_file(j, path):
string_to_file(json.dumps(j) + "\n", path)
def string_to_file(string, path):
with open(path, 'w') as f:
f.write(string)
def op_help(op):
if op == "list":
print(get_banner() +
colored_spell_name("spell list [<spell>]") + "\n" +
colored(YELLOW, " * ") + "List <spell> and its children.\n" +
colored(YELLOW, " * ") + "If <spell> is missing, list all spells in book.\n" +
"\n" +
colored(YELLOW, "-- Examples --") + "\n" +
spell_to_string("spell list", "List all spells.") + "\n" +
spell_to_string("spell list deploy prod", "List \"deploy prod\" and its children.") + "\n"
)
elif op == "add":
print(get_banner() +
colored_spell_name("spell add <spell> -c <command> [-ld <left_delimiter>] [-rd <right_delimiter>]") + "\n" +
colored(YELLOW, " * ") + "Add <spell> to book.\n" +
colored(YELLOW, " * ") + "Invoking the new spell will execute <command>.\n" +
colored(YELLOW, " * ") + "If present, <left_delimiter> and <right_delimiter> will be used for escaping argument definitions\n" +
"within <command>. Defaults are \"{\" and \"}\".\n" +
"\n" +
colored(YELLOW, "-- Examples --") + "\n" +
spell_to_string("spell add deploy prod -c \"sh $HOME/deploy_prod.sh\"", "Add \"deploy prod\" spell.") + "\n" +
spell_to_string("spell add deploy -c \"sh $HOME/deploy_[env].sh\" -ld [ -rd ]", "Add \"deploy\" spell.") + "\n" +
colored(YELLOW, " * ") + "Usage: \"deploy prod\" \"deploy --env prod\" \"deploy -env prod\"\n"
)
elif op == "remove":
print(get_banner() +
colored_spell_name("spell remove <spell>") + "\n" +
colored(YELLOW, " * ") + "Remove <spell> from book.\n"
"\n" +
colored(YELLOW, "-- Examples --") + "\n" +
spell_to_string("spell remove deploy prod", "Remove \"deploy prod\" spell.") + "\n"
)
else:
print(get_banner() +
spell_to_string("help", "Show this message or info about commands.") + "\n" +
spell_to_string("list", "List spells in book (use \"spell help list\" for more info).") + "\n" +
spell_to_string("add", "Add a spell to book (use \"spell help add\" for more info).") + "\n" +
spell_to_string("remove", "Remove a spell from book (use \"spell help remove\" for more info).") + "\n"
)
def get_banner():
return (" ____ ______ __ __\n"
" / __/__ ___ / / / / ___ ___ / //_/\n"
" _\\ \\/ _ \\/ -_/ / / _ \\/ _ \\/ _ \\/ < \n"
"/___/ .__/\\__/_/_/_.__/\\___/\\___/_/|_| \n"
" /_/ shell alias manager " + colored(GREEN, VERSION) + "\n\n")
def colored(color, text):
return color + text + UNCOLORED;
UNCOLORED='\033[0m'
RED='\033[1;31m'
GREEN='\033[1;32m'
YELLOW='\033[1;33m'
CYAN='\033[1;36m'
if __name__ == '__main__':
main()