1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
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()
|