Agordejo/engine/findprograms.py

#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copyright 2020, Nils Hilbricht, Germany ( https://www.hilbricht.net )

The Non-Session-Manager by Jonathan Moore Liles <male@tuxfamily.org>: http://non.tuxfamily.org/nsm/
With help from code fragments from https://github.com/attwad/python-osc ( DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE v2 )

API documentation: http://non.tuxfamily.org/nsm/API.html

This file is part of the Laborejo Software Suite ( https://www.laborejo.org ),

This application is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
import logging; logger = logging.getLogger(__name__); logger.info("import")

import pathlib
import configparser
import subprocess
import os
import stat


class SupportedProgramsDatabase(object):
    """Find all binaries. Use all available resources: xdg desktop files, binary string seach in
    executables, data bases, supplement with user choices.

    We generate the same format as configParser does with .desktop files as _sections dict.

    Example:
     { 'categories': 'AudioVideo;Audio;X-Recorders;X-Multitrack;X-Jack;',
       'comment': 'Easy to use pattern sequencer for JACK and NSM',
       'comment[de]': 'Einfach zu bedienender Pattern-Sequencer',
       'exec': 'patroneo',
       'genericname': 'Sequencer',
       'icon': 'patroneo',
       'name': 'Patroneo',
       'startupnotify': 'false',
       'terminal': 'false',
       'type': 'Application',       
       'x-nsm-capable': 'true'}

    In case there is a file in PATH or database but has no .desktop we create our own entry with
    missing data.
    """

    def __init__(self):
        self.blacklist = ("nsmd", "non-daw", "carla")
        self.morePrograms = ("thisdoesnotexisttest", "carla-rack", "carla-patchbay", "carla-jack-multi", "ardour5", "ardour6", "nsm-data", "nsm-jack") #only programs not found by buildCache_grepExecutablePaths because they are just shellscripts and do not contain /nsm/server/announce.        
        self.knownDesktopFiles = { #shortcuts to the correct desktop files. Reverse lookup binary->desktop creates false entries, for example ZynAddSubFx and Carla.
            "zynaddsubfx": "zynaddsubfx-jack.desktop", #value will later get replaced with the .desktop entry
            "carla-jack-multi" : "carla.desktop",             
        }        
        self.programs = [] #list of dicts. guaranteed keys: argodejoExec, name, argodejoFullPath. And probably others, like description and version.
        self.nsmExecutables = set() #set of executables for fast membership, if a GUI wants to know if they are available. Needs to be build "manually" with self.programs. no auto-property for a list. at least we don't want to do the work.
        #.build needs to be called from the api/GUI.
        self.unfilteredExecutables = self.buildCache_unfilteredExecutables() #This doesn't take too long. we can start that every time. It will get updated in build as well.
        #self.build() #fills self.programs and 

    def buildCache_grepExecutablePaths(self):
        """return a list of executable names in the path
        Grep explained:
        -s silent. No errors, eventhough subprocess uses stdout only
        -R recursive with symlinks. We don't want to look in subdirs because that is not allowed by
        PATH and nsm, but we want to follow symlinks
        """
        result = []
        executablePaths = [pathlib.Path(p) for p in os.environ["PATH"].split(":")]
        for path in executablePaths:
            command = f"grep -iRsnl {path} -e /nsm/server/announce"
            #Py>=3.7 completedProcess = subprocess.run(command, capture_output=True, text=True, shell=True)
            completedProcess = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True, shell=True) #universal_newlines is an alias for text, which was deprecated in 3.7 because text is more understandable.  capture_output replaces the two PIPEs in 3.7
            for fullPath in completedProcess.stdout.split():
                exe = pathlib.Path(fullPath).relative_to(path)                
                if not str(exe) in self.blacklist:
                    result.append((str(exe), str(fullPath)))                

        for prg in self.morePrograms:            
            for path in executablePaths:
                if pathlib.Path(path, prg).is_file():                    
                    result.append((str(prg), str(pathlib.Path(path, prg))))
                    break #inner loop
                    
        return result

    def buildCache_DesktopEntries(self):
        """Go through all dirs including subdirs"""
        xdgPaths = (
            pathlib.Path("/usr/share/applications"),
            pathlib.Path("/usr/local/share/applications"),
            pathlib.Path(pathlib.Path.home(), ".local/share/applications"),
            )

        config = configparser.ConfigParser()
        allDesktopEntries = []
        for basePath in xdgPaths:
            for f in basePath.glob('**/*'):
                if f.is_file() and f.suffix == ".desktop":
                    config.clear()
                    config.read(f)
                    entryDict = dict(config._sections["Desktop Entry"])                    
                    if f.name == "zynaddsubfx-jack.desktop":
                        self.knownDesktopFiles["zynaddsubfx"] = entryDict
                    elif f.name == "carla.desktop":
                        self.knownDesktopFiles["carla-jack-multi"] = entryDict
                    #in any case:
                    allDesktopEntries.append(entryDict)  #_sections   'DesktopEntry':{dictOfActualData)
        return allDesktopEntries

    def loadPrograms(self, listOfDicts):
        """Qt Settings will send us this"""
        self.programs = listOfDicts
        self.nsmExecutables = set(d["argodejoExec"] for d in self.programs)

    def build(self):
        """Can be called at any time by the user to update after installing new programs"""        
        logger.info("Building launcher database. This might take a minute")
        self.programs = self._build()
        self.unfilteredExecutables = self.buildCache_unfilteredExecutables()
        self.nsmExecutables = set(d["argodejoExec"] for d in self.programs)
        self._buildWhitelist()
        logger.info("Building launcher database done.")

    def _exeToDesktopEntry(self, exe:str)->dict:
        """Assumes self.desktopEntries is up to date
        Convert one exe (not full path!) to one dict entry. """
        if exe in self.knownDesktopFiles: #Shortcut through internal database
            entry = self.knownDesktopFiles[exe]
        else: #Reverse Search desktop files.                
            for entry in self.desktopEntries:
                if "exec" in entry and exe.lower() in entry["exec"].lower():                        
                    return entry
            #else: #Foor loop ended. Did not find any matching desktop file             

        return None

                
    def _build(self):        
        self.executables = self.buildCache_grepExecutablePaths()        
        self.desktopEntries = self.buildCache_DesktopEntries()

        leftovers = set(self.executables)
        matches = [] #list of dicts
        for exe, fullPath in self.executables:
            entry = self._exeToDesktopEntry(exe)
            if entry: #Found match!                 
                entry["argodejoFullPath"] = fullPath
                #We don't want .desktop syntax like "qmidiarp %F"
                entry["argodejoExec"] = exe
                matches.append(entry)
                            
                try:
                    leftovers.remove((exe,fullPath))
                except KeyError:
                    pass #Double entries like zyn-jack zyn-alsa etc.
                
            """
            if exe in self.knownDesktopFiles: #Shortcut through internal database
                entry = self.knownDesktopFiles[exe]
            else: #Reverse Search desktop files.                
                for entry in self.desktopEntries:
                    if "exec" in entry and exe.lower() in entry["exec"].lower():                        
                        break #found entry. break inner loop to keep it
                else: #Foor loop ended. Did not find any matching desktop file
                    #If we omit continue it will just write exe and fullPath in any desktop file.
                    continue

            #Found match!
            entry["argodejoFullPath"] = fullPath
            #We don't want .desktop syntax like "qmidiarp %F"
            entry["argodejoExec"] = exe
            matches.append(entry)
            
            try:
                leftovers.remove((exe,fullPath))
            except KeyError:
                pass #Double entries like zyn-jack zyn-alsa etc.
               """
                 
        for exe,fullPath in leftovers:
            pseudoEntry = {"name": exe.title(), "argodejoExec":exe, "argodejoFullPath":fullPath}
            matches.append(pseudoEntry)
        return matches
    
    def buildCache_unfilteredExecutables(self):
        def isexe(path):
            """executable by owner"""
            return path.is_file() and stat.S_IXUSR & os.stat(path)[stat.ST_MODE] == 64 
                        
        result = []
        executablePaths = [pathlib.Path(p) for p in os.environ["PATH"].split(":")]
        for path in executablePaths:
            result += [str(pathlib.Path(f).relative_to(path)) for f in path.glob("*") if isexe(f)]
        
        return sorted(list(set(result)))

    def _buildWhitelist(self):
        """For reliable, fast and easy selection this is the whitelist.
        It will be populated from a template-list of well-working clients and then all binaries not
        in the path are filtered out. This can be presented to the user without worries."""
        #Assumes to be called only from self.build
        startexecutables = set(("doesnotexist", "laborejo2", "patroneo", "vico", "fluajho", "carla-rack", "carla-patchbay", "carla-jack-multi", "ardour6", "drumkv1_jack", "synthv1_jack", "padthv1_jack", "samplv1_jack", "zynaddsubfx", "ADLplug", "OPNplug", "non-mixer", "non-sequencer", "non-timeline"))
        for prog in self.programs:            
            prog["whitelist"] = prog["argodejoExec"] in startexecutables
                       

        """
        matches = []      
        for exe in startexecutables:
            entry = self._exeToDesktopEntry(exe)
            if entry: #Found match!                                 
                #We don't want .desktop syntax like "qmidiarp %F"
                entry["argodejoExec"] = exe
                matches.append(entry)       
        return matches
        """

programDatabase = SupportedProgramsDatabase()