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79 lines
2.0 KiB
79 lines
2.0 KiB
"""Call external commands."""
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import curses
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import logging
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import re
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import subprocess
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import tempfile
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from bebop.page import Page
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def _pre_exec():
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curses.nocbreak()
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curses.echo()
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curses.curs_set(1)
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def _post_exec():
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curses.mousemask(curses.ALL_MOUSE_EVENTS)
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curses.curs_set(0)
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curses.noecho()
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curses.cbreak()
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def open_external_program(command):
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"""Call command as a subprocess, suspending curses rendering.
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The caller has to refresh whatever windows it manages after calling this
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method or garbage may be left on the screen.
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Returns:
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True if no exception occured.
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"""
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_pre_exec()
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result = True
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try:
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subprocess.run(command)
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except OSError as exc:
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logging.error(f"Failed to run '{command}': {exc}")
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result = False
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_post_exec()
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return result
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SUB_URL_RE = re.compile(r"(?<!\$)\$u")
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SUB_SRC_RE = re.compile(r"(?<!\$)\$s")
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SUB_LINK_RE = re.compile(r"(?<!\$)\$(\d+)")
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SUB_LITERAL_RE = re.compile(r"\$\$")
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def substitute_external_command(command: str, url: str, page: Page):
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"""Substitute "$" parts of the command with corresponding values.
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Valid substitutions are:
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- $u = current url
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- $n (with n any positive number) = link url
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- $s = current page source temp file
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- $$ = $
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Returns:
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The command with all the template parts replaced with the corresponding
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strings.
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Raises:
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ValueError if a substitution is wrong, e.g. a link ID which does not exist.
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"""
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# URL substitution.
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command = SUB_URL_RE.sub(url, command)
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# Source file substitution.
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if SUB_SRC_RE.search(command):
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with tempfile.NamedTemporaryFile("wt", delete=False) as source_file:
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source_file.write(page.source)
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command = SUB_SRC_RE.sub(source_file.name, command)
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# Link ID substitution.
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command = SUB_LINK_RE.sub(lambda m: page.links[int(m.group(1))], command)
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# Literal dollar sign.
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command = SUB_LITERAL_RE.sub("$", command)
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return command
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