[Bf-python] option to choose executable instead of raising error inside function

[Bastien Montagne]

Eh, it’s like any file, right? Just have a look around in other addons, 
many of them handle files…

I would point you to official ui_translate addon, for example, but it 
has some extra complexity you do not need… Just note that simply adding 
"subtype='FILE_PATH'" parameter to a string prop definition will turn it 
into a file-selector one in the UI… ;)

On 15/10/2013 19:38, flavio soares wrote:
> Hi, Bastien,
>
> Thanks for the link. I'll try to mess with it, but I think the addon 
> part is ok. The problem is really calling a window to choose the 
> executable and storing it in a variable.
>
>
> 2013/10/15 Bastien Montagne <montagne29 at wanadoo.fr 
> <mailto:montagne29 at wanadoo.fr>>
>
>     Hi Flavio,
>
>     Think you are looking for AddonPreferences ?
>     http://www.blender.org/documentation/blender_python_api_2_69_1/bpy.types.AddonPreferences.html
>
>     Bastien
>
>
>     On 15/10/2013 19:03, flavio soares wrote:
>>     Hi,
>>
>>     I'm doing an exporter to ardour and it runs an external ffmpeg.
>>     I'm wondering if there is a way of letting user point to a local
>>     ffmpeg executable in case it is not recognized by "which". The
>>     idea is to replace the RuntimeError with something like:
>>
>>     with open(self.filepath) as file:
>>                 ffCommand = self.filepath
>>
>>     but this only works inside classes.
>>
>>
>>
>>     Relevant code is below:
>>
>>     this is the main class:
>>
>>     class ExportArdour(bpy.types.Operator, ExportHelper):
>>         """Export audio timeline (including audios from videos) to
>>     Ardour"""
>>         bl_idname = "export.ardour"
>>         bl_label = "Export to Ardour"
>>         filename_ext = ".ardour"
>>         filter_glob = StringProperty(default="*.ardour",
>>     options={'HIDDEN'})
>>
>>         @classmethod
>>         def poll(cls, context):
>>             if bpy.context.sequences:
>>                 return context.sequences is not None
>>
>>         def execute(self, context):
>>             scene = bpy.context.scene
>>             startFrame = scene.frame_start
>>             endFrame = scene.frame_end
>>             fps, timecode = checkFPS()
>>
>>             system = bpy.context.user_preferences.system
>>             audioRate = int(system.audio_sample_rate.split("_")[1])
>>
>>             audiosFolderPath, ardourFile = os.path.split(self.filepath)
>>             ardourBasename = os.path.splitext(ardourFile)[0]
>>             audiosFolder = audiosFolderPath + os.sep + "Audios_for_"
>>     + ardourBasename
>>
>>             Session = createXML(startFrame, endFrame, fps, timecode,
>>     audioRate,
>>                                 ardourBasename, audiosFolder)
>>
>>             runFFMPEG(sources, audioRate, audiosFolder)
>>             writeXML(self.filepath, Session)
>>
>>             return {'FINISHED'}
>>
>>
>>     ..........that calls this function (notice the RunTime error):
>>
>>     def runFFMPEG(sources, audioRate, outputFolder):
>>         if which('ffmpeg') is not None:
>>             if (os.name <http://os.name> == "nt"):
>>                 ffCommand = ffmpegPath + os.sep + "ffmpeg.exe"
>>             else:
>>                 ffCommand = "ffmpeg"
>>         else:
>>             raise RuntimeError("You don\'t seem to have FFMPEG
>>     installed on your system. \
>>                                 Please install it and re-run the
>>     Ardour exporter.")
>>
>>         if (os.path.exists(outputFolder) is False):
>>             os.mkdir(outputFolder)
>>
>>         for source in sources:
>>             basename, ext = os.path.splitext(source['name'])
>>
>>             input = source['origin']
>>             if (input.startswith("//")):
>>                 input = input.replace("//", "")
>>
>>             output = outputFolder + os.sep + basename + ".wav"
>>
>>             # Due to spaces, the command entries (ffCommand, input
>>     and output) have
>>             # to be read as strings by the call command, thus the
>>     escapings below
>>             callFFMPEG = "\"%s\" -i \"%s\" -y -vn -ar %i -ac 1 \"%s\"" \
>>                          % (ffCommand, input, audioRate, output)
>>             call(callFFMPEG, shell=True)
>>
>>         return {'FINISHED'}
>>
>>
>>
>>     thanks.
>>
>>     flavio
>>
>>
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