add an application param for prompt-open-download

doc/help/commands.asciidoc

@@ -1168,8 +1168,15 @@ Answer no to a yes/no prompt.
 
 [[prompt-open-download]]
 === prompt-open-download
+Syntax: +:prompt-open-download ['cmdline']+
+
 Immediately open a download.
 
+==== positional arguments
+* +'cmdline'+: The command line string to execute. The default will use the system's application to open the file, depending on
+ the filetype.
+
+
 [[prompt-yes]]
 === prompt-yes
 Answer yes to a yes/no prompt.

qutebrowser/browser/webkit/downloads.py

@@ -22,6 +22,7 @@
 import io
 import os
 import sys
+import shlex
 import os.path
 import shutil
 import functools
@@ -40,6 +41,7 @@ from qutebrowser.config import config
 from qutebrowser.commands import cmdexc, cmdutils
 from qutebrowser.utils import (message, usertypes, log, utils, urlutils,
                                objreg, standarddir, qtutils)
+from qutebrowser.misc import guiprocess
 from qutebrowser.browser.webkit import http
 from qutebrowser.browser.webkit.network import networkmanager
 
@@ -955,19 +957,39 @@ class DownloadManager(QAbstractListModel):
                 download.cancel()
                 return
             download.finished.connect(
-                functools.partial(self._open_download, download))
+                functools.partial(self._open_download, download,
+                                  target.cmdline))
             download.autoclose = True
             download.set_fileobj(fobj)
         else:
             log.downloads.error("Unknown download target: {}".format(target))
 
-    def _open_download(self, download):
-        """Open the given download but only if it was successful."""
-        if download.successful:
-            download.open_file()
-        else:
+    def _open_download(self, download, cmdline):
+        """Open the given download but only if it was successful.
+
+        Args:
+            download: The DownloadItem to use.
+            cmdline: The command to use, or None for the system's default
+                     program.
+        """
+        if not download.successful:
             log.downloads.debug("{} finished but not successful, not opening!"
                                 .format(download))
+        if cmdline is None:
+            download.open_file()
+            return
+
+        cmd, *args = shlex.split(cmdline)
+        filename = download._filename
+        if filename is None:
+            filename = getattr(download.fileobj, 'name', None)
+        if filename is None:
+            raise ValueError("Download has no filename to open")
+        args = [filename if arg == '{}' else arg for arg in args]
+
+        proc = guiprocess.GUIProcess(self._win_id, what='process')
+        proc.start_detached(cmd, args)
+
 
     def raise_no_download(self, count):
         """Raise an exception that the download doesn't exist.

qutebrowser/mainwindow/statusbar/prompter.py

@@ -312,13 +312,20 @@ class Prompter(QObject):
         self._question.done()
 
     @cmdutils.register(instance='prompter', hide=True, scope='window',
-                       modes=[usertypes.KeyMode.prompt])
-    def prompt_open_download(self):
-        """Immediately open a download."""
+                       modes=[usertypes.KeyMode.prompt], maxsplit=0)
+    def prompt_open_download(self, cmdline: str=None):
+        """Immediately open a download.
+
+        Args:
+            cmdline: The command line string to execute. The default will use
+                     the system's application to open the file, depending on
+                     the filetype. A `{}` is expanded to the temporary file
+                     name.
+        """
         if self._question.mode != usertypes.PromptMode.download:
             # We just ignore this if we don't have a download question.
             return
-        self._question.answer = usertypes.OpenFileDownloadTarget()
+        self._question.answer = usertypes.OpenFileDownloadTarget(cmdline)
         modeman.maybe_leave(self._win_id, usertypes.KeyMode.prompt,
                             'download open')
         self._question.done()

qutebrowser/utils/usertypes.py

@@ -297,11 +297,16 @@ class FileObjDownloadTarget(DownloadTarget):
 
 class OpenFileDownloadTarget(DownloadTarget):
 
-    """Save the download in a temp dir and directly open it."""
+    """Save the download in a temp dir and directly open it.
 
-    def __init__(self):
+    Attributes:
+        cmdline: The command to use as string. A {} is expanded to th
+                 filename. None means use the system's default.
+    """
+
+    def __init__(self, cmdline=None):
         # pylint: disable=super-init-not-called
-        pass
+        self.cmdline = cmdline
 
 
 class Question(QObject):