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from typing import List, Dict, Tuple
from dataclasses import dataclass
import os
import sys
import textwrap
from .color import (
get_color_codes,
surround_ansi_escapes,
ColorCode
)
@dataclass
class Command( object ):
name : str
description : str
# eventually could contain arguments
PromptResponse = Tuple[Command, None] | Tuple[None, str]
class PromptUsageException(Exception):
def __init__( self : "PromptUsageException", message : str):
self.message = message
class Prompt( object ):
COMMAND_INDICATOR = "/"
SEP = ' '
def __init__(self : "Prompt", prompt : str, cmds : List[Command]):
self.prompt = prompt
self._cmds = { cmd.name : cmd for cmd in cmds }
def print_help( self : "Prompt", file=sys.stdout ):
cmds = list(self._cmds.values())
cmds.sort(key=lambda cmd: cmd.name)
COMMAND_HEADER = "Command"
DESCRIPTION_HEADER = "Description"
MAX_COLUMN_LEN = 80
SPACING = 2
SEP = SPACING * ' '
# Calculate column widths
name_width = max(len(cmd.name) for cmd in cmds)
name_width = max(len(COMMAND_HEADER), name_width)
desc_width = max(len(cmd.description) for cmd in cmds)
desc_width = max(len(DESCRIPTION_HEADER), desc_width)
desc_width = min(desc_width, MAX_COLUMN_LEN - SPACING - name_width)
# Print headers
print(f"{'Command':<{name_width}}{SEP}{'Description':<{desc_width}}", file=file)
print("-" * (name_width + desc_width + SPACING), file=file)
# Print rows
for cmd in cmds:
name = cmd.name.ljust(name_width)
desc_lines = textwrap.wrap(cmd.description, desc_width)
desc = ''
for i, desc_line in enumerate(desc_lines):
if i == 0:
desc += desc_line + '\n'
else:
desc += ' ' * (SPACING + name_width)
desc += desc_line + '\n'
print(f"{name}{SEP}{desc}", file=file, end='')
print()
def _parse_response( self : "Prompt", response : str) \
-> PromptResponse:
if not response.startswith(Prompt.COMMAND_INDICATOR):
return (None, response)
cmd_parts = response[1:].split(sep=Prompt.SEP)
cmd_name = cmd_parts[0].strip()
if cmd_name not in self._cmds:
raise PromptUsageException(f'command not found: {cmd_name}')
cmd = self._cmds[cmd_name]
return (cmd, None)
def input( self : "Prompt" ):
while True:
try:
raw_input = input(self.prompt)
response = self._parse_response( raw_input )
return response
except PromptUsageException as e:
print(f'error: {e.message}', file=sys.stderr)
class Prompter( object ):
_cmds : Dict[str, Command]
def __init__( self : "Prompter", no_color=False ):
self._cmds = []
self._COLOR = get_color_codes( no_color=no_color )
self._PROMPT = surround_ansi_escapes(
f'[{self._COLOR.WHITE}#{self._COLOR.RESET}] '
)
self._prev_completer_delims = None
def add_command( self : "Prompter", name : str, description : str ):
cmd = Command(name, description)
self._cmds.append(cmd)
return cmd
def _enable_prompting( self : "Prompter" ):
try:
import readline as rl
def completer( text, state ):
# stop completions when slash commands
# are not specified
buffer = rl.get_line_buffer()
if len(buffer) == 0 or buffer[0] != '/':
return None
completion_options = [ cmd.name for cmd in self._cmds ]
options = [ i for i in completion_options if i.startswith(text) ]
if state < len(options):
return options[state]
else:
return None
rl.set_completer(completer)
self._prev_completer_delims = rl.get_completer_delims()
rl.set_completer_delims('/')
rl.parse_and_bind('tab: complete')
except ImportError:
pass
def _disable_prompting(self : "Prompter"):
# try our best to clean up
try:
import readline as rl
rl.set_completer(None)
rl.parse_and_bind('tab: insert-tab')
rl.set_completer_delims(self._prev_completer_delims)
except ImportError:
pass
def __enter__(self : "Prompter"):
self._enable_prompting()
return Prompt(self._PROMPT, self._cmds)
def __exit__(self : "Prompter", exec_type, exec_val, exc_tb):
self._disable_prompting()
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