99 lines
3.1 KiB
Python
99 lines
3.1 KiB
Python
"""
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To be used with a companion fish function like this:
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function refish
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set -l _x (python /tmp/bass.py source ~/.nvm/nvim.sh ';' nvm use iojs); source $_x; and rm -f $_x
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end
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"""
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from __future__ import print_function
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import json
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import subprocess
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import sys
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import traceback
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BASH = 'bash'
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def comment(string):
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return '\n'.join(['# ' + line for line in string.split('\n')])
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def gen_script():
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divider = '-__-__-__bass___-env-output-__bass_-__-__-__-__'
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# Use the following instead of /usr/bin/env to read environment so we can
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# deal with multi-line environment variables (and other odd cases).
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env_reader = "python -c 'import os,json; print(json.dumps({k:v for k,v in os.environ.items()}))'"
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args = [BASH, '-c', env_reader]
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output = subprocess.check_output(args, universal_newlines=True)
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old_env = output.strip()
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command = '{} && (echo "{}"; {}; echo "{}"; alias)'.format(
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' '.join(sys.argv[1:]).rstrip().rstrip(';'),
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divider,
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env_reader,
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divider,
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)
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args = [BASH, '-c', command]
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output = subprocess.check_output(args, universal_newlines=True)
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stdout, new_env, alias = output.split(divider, 2)
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new_env = new_env.strip()
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old_env = json.loads(old_env)
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new_env = json.loads(new_env)
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script_lines = []
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for line in stdout.splitlines():
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# some outputs might use documentation about the shell usage with dollar signs
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line = line.replace(r'$', r'\$')
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script_lines.append("printf %s;printf '\\n'" % json.dumps(line))
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for k, v in new_env.items():
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if k in ['PS1', 'SHLVL', 'XPC_SERVICE_NAME'] or k.startswith("BASH_FUNC"):
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continue
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v1 = old_env.get(k)
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if not v1:
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script_lines.append(comment('adding %s=%s' % (k, v)))
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elif v1 != v:
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script_lines.append(comment('updating %s=%s -> %s' % (k, v1, v)))
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# process special variables
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if k == 'PWD':
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script_lines.append('cd %s' % json.dumps(v))
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continue
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else:
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continue
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if k == 'PATH':
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# use json.dumps to reliably escape quotes and backslashes
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value = ' '.join([json.dumps(directory)
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for directory in v.split(':')])
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else:
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# use json.dumps to reliably escape quotes and backslashes
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value = json.dumps(v)
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script_lines.append('set -g -x %s %s' % (k, value))
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for var in set(old_env.keys()) - set(new_env.keys()):
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script_lines.append(comment('removing %s' % var))
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script_lines.append('set -e %s' % var)
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script = '\n'.join(script_lines)
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return script + '\n' + alias
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if not sys.argv[1:]:
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print('__usage', end='')
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sys.exit(0)
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try:
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script = gen_script()
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except subprocess.CalledProcessError as e:
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print('exit code:', e.returncode, file=sys.stderr)
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print('__error', e.returncode, end='')
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except Exception as e:
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print('unknown error:', str(e), file=sys.stderr)
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traceback.print_exc(10, file=sys.stderr)
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print('__error', end='')
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else:
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print(script, end='')
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