settings.py

import logging
import sys
import os
from os.path import basename, join
import subprocess
from glob import glob
import shutil

import bpy
from bpy.types import AddonPreferences
from bpy.props import BoolProperty, FloatVectorProperty, EnumProperty, IntProperty, FloatProperty, StringProperty

from sverchok.ui.utils import (
        MENU_TYPE_DEFAULT, MENU_TYPE_SVERCHOK, MENU_TYPE_USER,
        get_sverchok_menu_presets_directory, get_user_menu_presets_directory,
        get_menu_preset_path,
        datafiles,
        message_on_layout
    )

"""Don't import other Sverchok modules here"""

if bpy.app.version >= (2, 91, 0):
    PYPATH = sys.executable
else:
    PYPATH = bpy.app.binary_path_python


# names from other modules
sv_dependencies, pip, ensurepip, draw_message, get_icon = [None] * 5
set_frame_change = None
draw_extra_addons = None
apply_theme, rebuild_color_cache, color_callback = [None] * 3

def get_params(prop_names_and_fallbacks, direct=False):
    """
    This function returns an object which you can use the . op on.
    example usage:

        from sverchok.settings import get_params

        props = get_params({'prop_name_1': 20, 'prop_name_2': 30})
        # props.prop_name_1    20
        # props.prop_name_2    30

    example usage using direct=True
        props = get_params({'prop_name_1': 20, 'prop_name_2': 30}, direct=True)
        # props[0]   20
        # props[1]   30 
    """
    from sverchok.utils.context_managers import sv_preferences

    props = lambda: None

    with sv_preferences() as prefs:
        for k, v in prop_names_and_fallbacks.items():
            try:
                value = getattr(prefs, k)
            except:
                print(f'returning a default for {k}')
                value = v
            setattr(props, k, value)

    if direct:
        return [getattr(props, k) for k in prop_names_and_fallbacks.keys()]

    return props

def get_param(prop_name, fallback):
    """
    for getting a single parameter from sv preferences
    example usage:

        from sverchok.settings import get_params
        prop = get_param("render_scale", 1.0)
        # prop = 1.0 if settings wasn't available, or else the current value
    """
    from sverchok.utils.context_managers import sv_preferences
    with sv_preferences() as prefs:
        try:
            value = getattr(prefs, prop_name)
        except:
            print(f'returning a default for {prop_name}')
            value = fallback
        return value

def apply_theme_if_necessary():
    if get_param("apply_theme_on_open", False):
        apply_theme()
        print("applied theme.")

# getDpiFactor and getDpi are lifted from Animation Nodes :)

def get_dpi_factor(factor=0.014):
    system_preferences = bpy.context.preferences.system
    retina_factor = getattr(system_preferences, "pixel_size", 1)
    dpi = system_preferences.dpi * retina_factor
    return dpi * factor


class SvExPipInstall(bpy.types.Operator):
    """Install the package by calling pip install"""
    bl_idname = 'node.sv_ex_pip_install'
    bl_label = "Install the package"
    bl_options = {'REGISTER', 'INTERNAL'}

    package : bpy.props.StringProperty(name = "Package names")

    def execute(self, context):
        # https://github.com/robertguetzkow/blender-python-examples/tree/master/add_ons/install_dependencies
        environ_copy = dict(os.environ)
        environ_copy["PYTHONNOUSERSITE"] = "1"  # is set to disallow pip from checking the user site-packages
        cmd = [PYPATH, '-m', 'pip', 'install', '--upgrade'] + self.package.split(" ")
        ok = subprocess.call(cmd, env=environ_copy) == 0
        if ok:
            first_install = self.package in sv_dependencies and sv_dependencies[self.package] is None
            if first_install:
                self.report({'INFO'}, "%s installed successfully. Please restart Blender to see effect." % self.package)
            else:
                self.report({'INFO'}, "%s upgraded successfully. Please restart Blender to see effect." % self.package)
            return {'FINISHED'}
        else:
            self.report({'ERROR'}, "Cannot install %s, see console output for details" % self.package)
            return {'CANCELLED'}

class SvExEnsurePip(bpy.types.Operator):
    """Install PIP by using ensurepip module"""
    bl_idname = "node.sv_ex_ensurepip"
    bl_label = "Install PIP"
    bl_options = {'REGISTER', 'INTERNAL'}

    def execute(self, context):
        environ_copy = dict(os.environ)
        environ_copy["PYTHONNOUSERSITE"] = "1"  # is set to disallow pip from checking the user site-packages
        cmd = [PYPATH, '-m', 'ensurepip']
        ok = subprocess.call(cmd, env=environ_copy) == 0
        if ok:
            if 'snap' in sys.executable:
                msg = 'It seems that your Blender is a snap package. Such' \
                      'packages does not support writing any files. Reinstall' \
                      'Blender to be able to use external Python packages'
                self.report({'WARNING'}, msg)
            else:
                self.report({'INFO'}, "PIP installed successfully. Please restart Blender to see effect.")
            return {'FINISHED'}
        else:
            self.report({'ERROR'}, "Cannot install PIP, see console output for details")
            return {'CANCELLED'}

class SvSelectFreeCadPath(bpy.types.Operator):
    """Select a directory with FreeCAD Python API libraries"""
    bl_idname = "node.sv_select_freecad_path"
    bl_label = "Select FreeCAD Path"
    bl_options = {'REGISTER', 'INTERNAL'}

    directory : bpy.props.StringProperty(
            name = "FreeCAD path",
            description = "Path to FreeCAD Python API libraries",
            subtype = 'DIR_PATH'
        )

    def execute(self, context):
        from sverchok.utils.context_managers import sv_preferences
        with sv_preferences() as prefs:
            prefs.FreeCAD_folder = self.directory
        return {'FINISHED'}

    def invoke(self, context, event):
        context.window_manager.fileselect_add(self)
        return {'RUNNING_MODAL'}

class SvSetFreeCadPath(bpy.types.Operator):
    """Save FreeCAD path in system"""
    bl_idname = "node.sv_set_freecad_path"
    bl_label = "Set FreeCAD path"
    bl_options = {'REGISTER', 'INTERNAL'}
    FreeCAD_folder: bpy.props.StringProperty(name="FreeCAD python 3.7 folder")
    def execute(self, context):
        import sys
        import os
        site_packages = ''
        for p in sys.path:
            if 'site-packages' in p:
                site_packages = p
                break

        file_path = open(join(site_packages, "freecad_path.pth"), "w+")
        file_path.write(self.FreeCAD_folder)
        file_path.close()

        self.report({'INFO'}, "FreeCad path saved successfully. Please restart Blender to see effect.")
        return {'FINISHED'}

class SvOverwriteMenuFile(bpy.types.Operator):
    """Overwrite your index.yaml in datafiles with the selected preset"""
    bl_idname = "node.sv_select_index_yaml_preset"
    bl_label = "Save index.yaml preset"
    bl_options = {'REGISTER', 'INTERNAL'}

    preset_path : bpy.props.StringProperty(name = "Preset file path")

    def execute(self, context):
        target_menu_file = join(datafiles, 'index.yaml')
        preset_path = get_menu_preset_path(self.preset_path)
        shutil.copy(preset_path, target_menu_file)
        self.report({'INFO'}, f"Menu preset {preset_path} saved as {target_menu_file}. Please restart Blender to see effect.")
        return {'FINISHED'}

class SverchokPreferences(AddonPreferences):
    import sverchok
    bl_idname = sverchok.__name__

    def set_frame_change(self, context):
        set_frame_change(self.frame_change_mode)

    def update_theme(self, context):
        rebuild_color_cache()
        if self.auto_apply_theme:
            apply_theme()

    tab_modes = [(n.replace(' ', '_'), n, '', i) for i, n in
                 enumerate(["General", "Node Defaults", "Extra Nodes", "Theme"])]

    selected_tab: bpy.props.EnumProperty(
        items=tab_modes,
        description="pick viewing mode",
        default="General"
    )

    no_data_color: FloatVectorProperty(
        name="No data", description='When a node can not get data',
        size=3, min=0.0, max=1.0,
        default=(1, 0.3, 0), subtype='COLOR_GAMMA',
    )

    exception_color: FloatVectorProperty(
        name="Error", description='When node has an exception',
        size=3, min=0.0, max=1.0,
        default=(0.8, 0.0, 0), subtype='COLOR_GAMMA',
    )

    # Profiling settings
    profiling_sections = [
        ("NONE", "Disable", "Disable profiling", 0),
        ("MANUAL", "Marked methods only", "Profile only methods that are marked with @profile decorator", 1),
        ("UPDATE", "Node tree update", "Profile whole node tree update process", 2)
    ]

    profile_mode: EnumProperty(name = "Profiling mode",
            items = profiling_sections,
            default = "NONE",
            description = "Performance profiling mode")

    developer_mode: BoolProperty(name = "Developer mode",
            description = "Show some additional panels or features useful for Sverchok developers only",
            default = False)

    #  theme settings
    themes = [("default_theme", "Default", "Default"),
              ("nipon_blossom", "Nipon Blossom", "Nipon Blossom"),
              ("grey", "Grey", "Grey"),
              ("darker", "Darker", "Darker")]

    sv_theme: EnumProperty(
        items=themes,
        name="Theme preset",
        description="Select a theme preset",
        update=color_callback,
        default="default_theme")

    auto_apply_theme: BoolProperty(
        name="Apply theme", description="Apply theme automatically",
        default=False)

    apply_theme_on_open: BoolProperty(
        name="Apply theme", description="Apply theme automatically",
        default=False)

    color_viz: FloatVectorProperty(
        name="Visualization", description='',
        size=3, min=0.0, max=1.0,
        default=(1, 0.589, 0.214), subtype='COLOR_GAMMA',
        update=update_theme)

    color_tex: FloatVectorProperty(
        name="Text", description='',
        size=3, min=0.0, max=1.0,
        default=(0.5, 0.5, 1), subtype='COLOR_GAMMA',
        update=update_theme)

    color_sce: FloatVectorProperty(
        name="Scene", description='',
        size=3, min=0.0, max=1.0,
        default=(0, 0.5, 0.2), subtype='COLOR_GAMMA',
        update=update_theme)

    color_lay: FloatVectorProperty(
        name="Layout", description='',
        size=3, min=0.0, max=1.0,
        default=(0.674, 0.242, 0.363), subtype='COLOR_GAMMA',
        update=update_theme)

    color_gen: FloatVectorProperty(
        name="Generator", description='',
        size=3, min=0.0, max=1.0,
        default=(0, 0.5, 0.5), subtype='COLOR_GAMMA',
        update=update_theme)

    #  frame change
    frame_change_modes = [
        ("PRE", "Pre", "Update Sverchok before frame change", 0),
        ("POST", "Post", "Update Sverchok after frame change", 1),
        ("NONE", "None", "Sverchok doesn't update on frame change", 2)
    ]

    frame_change_mode: EnumProperty(
        items=frame_change_modes,
        name="Frame change",
        description="Select frame change handler",
        default="POST",
        update=set_frame_change)

    #  Menu settings

    show_icons: BoolProperty(
        name="Show icons in Shift-A menu",
        default=False,
        description="Use icons in Shift-A menu")

    over_sized_buttons: BoolProperty(
        default=False, name="Big buttons", description="Very big buttons")

    input_links_options = [
            ('NONE', "Do not show", "Do not show", 0),
            ('QUICKLINK', "Show single option only",
                "Show the button only for cases when there is only one node to be created can be suggested; do not show the menu", 1),
            ('ALL', "Show `Create parameter' options",
                "Show the button with a menu with options to create parameter nodes", 2)
        ]

    show_input_menus : EnumProperty(
            name = "Show input menus",
            description = "Whether to display buttons near node socket inputs to automatically create parameter nodes",
            items = input_links_options,
            default = 'QUICKLINK'
        )

    ##  BLF/BGL/GPU  scale and location props

    render_scale: FloatProperty(
        default=1.0, min=0.01, step=0.01, description='default render scale')

    render_location_xy_multiplier: FloatProperty(
        default=1.0, min=0.01, step=0.01, description='default render location scale')


    stethoscope_view_scale: FloatProperty(
        default=1.0, min=0.01, step=0.01, description='default stethoscope scale')

    index_viewer_scale: FloatProperty(
        default=1.0, min=0.01, step=0.01, description='default index viewer scale')

    auto_update_angle_values: BoolProperty(
        default=True,
        description="Auto update angle values when angle units are changed to preserve the angle")

    def set_nodeview_render_params(self, context):
        self.render_scale = get_dpi_factor()   # this was intended as a general draw scale multiplier, not location but size.
        self.render_location_xy_multiplier = get_dpi_factor()

    external_editor: StringProperty(description='which external app to invoke to view sources')
    real_sverchok_path: StringProperty(description='use with symlinked to get correct src->dst')

    github_token : StringProperty(name = "GitHub API Token",
                    description = "GitHub API access token. Should have 'gist' OAuth scope.",
                    subtype="PASSWORD")

    # Logging settings

    def update_log_level(self, context):
        sv_logger = logging.getLogger('sverchok')
        sv_logger.info("Setting log level to %s", self.log_level)
        sv_logger.setLevel(self.log_level)

    log_levels = [
            ("DEBUG", "Debug", "Debug output", 0),
            ("INFO", "Information", "Informational output", 1),
            ("WARNING", "Warnings", "Show only warnings and errors", 2),
            ("ERROR", "Errors", "Show errors only", 3)
        ]

    log_level: EnumProperty(name = "Logging level",
            description = "Minimum events severity level to output. All more severe messages will be logged as well.",
            items = log_levels,
            update = update_log_level,
            default = "INFO")

    log_to_buffer: BoolProperty(name = "Log to text buffer",
            description = "Enable log output to internal Blender's text buffer (requires restart)",
            default = True)
    log_to_buffer_clean: BoolProperty(
        name="Clear buffer at saving file",
        description="Clear text buffer each time when file is saved",
        default=True)
    log_to_file: BoolProperty(name = "Log to file",
            description = "Enable log output to external file (requires restart)",
            default = False)
    log_to_console: BoolProperty(name = "Log to console",
            description = "Enable log output to console / terminal / standard output (requires restart)",
            default = True)

    log_buffer_name: StringProperty(name = "Buffer name", default = "sverchok.log")
    log_file_name: StringProperty(name = "File path", default = join(datafiles, "sverchok.log"))


    # updating sverchok
    dload_archive_name: StringProperty(name="archive name", default="master") # default = "master"
    dload_archive_path: StringProperty(name="archive path", default="https://github.com/nortikin/sverchok/archive/")
    available_new_version: bpy.props.BoolProperty(default=False)

    FreeCAD_folder: StringProperty(
            name="FreeCAD python 3.7 folder",
            description = "Path to FreeCAD Python API library files (FreeCAD.so on Linux and MacOS, FreeCAD.dll on Windows). On Linux the usual location is /usr/lib/freecad/lib, on Windows it can be something like E:\programs\conda-0.18.3\\bin"
        )

    def get_menu_presets(self, context):
        items = []
        name = 'index.yaml'
        id = join(MENU_TYPE_DEFAULT, name)
        items.append((id, f"Default ({name})", "Use default menu"))
        menus = join(get_sverchok_menu_presets_directory(), '*.yaml')
        for path in sorted(glob(menus)):
            name = basename(path)
            id = join(MENU_TYPE_SVERCHOK, name)
            description = f"{name} (built-in)"
            items.append((id, description, description))
        menus = join(get_user_menu_presets_directory(), '*.yaml')
        for path in sorted(glob(menus)):
            name = basename(path)
            id = join(MENU_TYPE_USER, name)
            description = f"{name} (user-defined)"
            items.append((id, description, description))
        return items

    menu_preset : EnumProperty(
            name = "Menu preset",
            description = "Choose a preset for Sverchok Add Node menu to be used. You can edit your menu later by editing index.yaml file under your datafiles/sverchok directory",
            items = get_menu_presets,
        )

    menu_usage_options = [
            ('SVERCHOK', "Use preset file", "Original menu preset file will be used. So the menu will be updated automatically when the preset is updated within Sverchok distribution", 0),
            ('COPY', "Use local copy of preset file", "Menu preset file will be copied under your datafiles directory. You may edit it manually without touching the preset file in Sverchok directory. But the responsibility of updating the menu when a node is added into Sverchok is yours", 1)
        ]

    menu_preset_usage : EnumProperty(
            name = "Application mode",
            description = "Menu preset application mode",
            items = menu_usage_options,
            default = 'SVERCHOK'
        )

    def general_tab(self, layout):
        col = layout.row().column()
        col_split = col.split(factor=0.5)
        col1 = col_split.column()

        box = col1.box()
        box.label(text = "Menu presets:")
        menu_col = box.column()
        menu_col.prop(self, 'menu_preset', text='Preset')
        if self.menu_preset_usage == 'COPY':
            menu_split = menu_col.split(factor=0.8)
            split_prop = menu_split.column()
            split_prop.prop(self, 'menu_preset_usage', text='')
            op_split = menu_split.column()
            op = op_split.operator(SvOverwriteMenuFile.bl_idname, text="Copy")
            op.preset_path = self.menu_preset
        else:
            menu_col.prop(self, 'menu_preset_usage', text='')

        col1.prop(self, "external_editor", text="Ext Editor")
        col1.prop(self, "real_sverchok_path", text="Src Directory")

        box = col1.box()
        box.label(text="Export to Gist")
        box.prop(self, "github_token")
        box.label(text="To export node trees to gists, you have to create a GitHub API access token.")
        box.label(text="For more information, visit " + "https://github.com/nortikin/sverchok/wiki/Set-up-GitHub-account-for-exporting-node-trees-from-Sverchok")
        box.operator("node.sv_github_api_token_help", text="Visit documentation page")

        col2 = col_split.split().column()
        col2.label(text="Frame change handler:")
        col2.row().prop(self, "frame_change_mode", expand=True)
        col2.separator()

        col2box = col2.box()
        col2box.label(text="Debug:")
        col2box.prop(self, "developer_mode")

        log_box = col2.box()
        log_box.label(text="Logging:")
        log_box.prop(self, "log_level")

        buff_row = log_box.row()
        buff_row.prop(self, "log_to_buffer")
        if self.log_to_buffer:
            buff_row.prop(self, "log_buffer_name")
            log_box.prop(self, "log_to_buffer_clean")

        file_row = log_box.row()
        file_row.prop(self, "log_to_file")
        if self.log_to_file:
            file_row.prop(self, "log_file_name")

        log_box.prop(self, "log_to_console")

    def node_defaults_tab(self, layout):
        row = layout.row()
        col = row.column(align=True)
        row_sub1 = col.row().split(factor=0.5)
        box_sub1 = row_sub1.box()
        box_sub1_col = box_sub1.column(align=True)

        box_sub1_col.label(text='Render Scale & Location')
        box_sub1_col.label(text=f'xy multiplier: {self.render_location_xy_multiplier}')

        box_sub1_col.label(text='Stethoscope')
        box_sub1_col.prop(self, 'stethoscope_view_scale', text='scale')

        box_sub1_col.label(text='Index Viewer')
        box_sub1_col.prop(self, 'index_viewer_scale', text='scale')

        box_sub2 = box_sub1.box()
        box_sub2_col = box_sub2.column(align=True)
        box_sub2_col.label(text='Angle Units')
        box_sub2_col.prop(self, 'auto_update_angle_values', text="Auto Update Angle Values")

        col3 = row_sub1.split().column()

    def theme_tab(self, layout):
        row = layout.row()
        col = row.column(align=True)
        split = col.row().split(factor=0.66)
        split2 = col.row().split(factor=0.66)
        left_split = split.row()
        right_split = split.row()

        split_viz_colors = left_split.column().split(factor=0.5, align=True)

        if True:
            col1 = split_viz_colors.column()
            for name in ['color_viz', 'color_tex', 'color_sce']:
                r = col1.row()
                r.prop(self, name)

            col2 = split_viz_colors.column()
            for name in ['color_lay', 'color_gen']:
                r = col2.row()
                r.prop(self, name)

        split_extra_colors = split2.column().split()
        col_x1 = split_extra_colors.column()
        col_x1.label(text="Error colors: ( error / no data )")
        row_x1 = col_x1.row()
        row_x1.prop(self, "exception_color", text='')
        row_x1.prop(self, "no_data_color", text='')

        col_x2 = split_extra_colors.split().column()

        col3 = right_split.column()
        col3.label(text='Theme:')
        col3.prop(self, 'sv_theme', text='')
        col3.separator()
        col3.prop(self, 'auto_apply_theme', text="Auto apply theme changes")
        col3.prop(self, 'apply_theme_on_open', text="Apply theme when opening file")
        col3.operator('node.sverchok_apply_theme', text="Apply theme to layouts")

    def extra_nodes_tab(self, layout):

        def draw_freecad_ops():
            dependency = sv_dependencies['freecad']
            col = box.column(align=True)
            col.label(text=dependency.message, icon=get_icon(dependency.module))
            row = col.row(align=True)
            row.operator('wm.url_open', text="Visit package website").url = dependency.url
            if dependency.module is None:
                tx = "Set path"
            else:
                tx = "Reset path"
            row.prop(self, 'FreeCAD_folder')
            row.operator('node.sv_select_freecad_path', text="Browse...").directory = self.FreeCAD_folder
            row.operator('node.sv_set_freecad_path', text=tx).FreeCAD_folder = self.FreeCAD_folder
            return row

        message_on_layout(layout, """Sverchok can use several external libraries, that provide \
some mathematical or other functions. We call such libraries "Dependencies". \
When these libraries are available, you will be able to use much more nodes \
in Sverchok. If you do not need all these features, you can skip installation of \
dependencies, or install only some of them.""")

        box = layout.box()
        box.label(text="Dependencies:")

        row = draw_message(box, "pip")
        if pip is not None:
            row.operator('node.sv_ex_pip_install', text="Upgrade PIP").package = "pip setuptools wheel"
        else:
            if ensurepip is not None:
                row.operator('node.sv_ex_ensurepip', text="Install PIP")
            else:
                row.operator('wm.url_open', text="Installation instructions").url = "https://pip.pypa.io/en/stable/installing/"

        draw_message(box, "scipy")
        draw_message(box, "geomdl")
        draw_message(box, "skimage")
        draw_message(box, "mcubes")
        draw_message(box, "circlify")
        draw_message(box, "cython")
        draw_message(box, "numba")
        draw_message(box, "pyOpenSubdiv")

        draw_freecad_ops()

        if any(package.module is None for package in sv_dependencies.values()):
            box.operator('wm.url_open', text="Read installation instructions for missing dependencies").url = "https://github.com/nortikin/sverchok/wiki/Dependencies"
        draw_extra_addons(layout)

    def draw(self, context):

        layout = self.layout
        layout.row().prop(self, 'selected_tab', expand=True)

        if self.selected_tab == "General":
            self.general_tab(layout)


        if self.selected_tab == "Node_Defaults":
            self.node_defaults_tab(layout)

        if self.selected_tab == "Extra_Nodes":
            self.extra_nodes_tab(layout)

        if self.selected_tab == "Theme":
            self.theme_tab(layout)

        # FOOTER

        row = layout.row()
        col = row.column(align=True)
        col.label(text="Links:")
        row1 = col.row(align=True)
        row1.scale_y = 2.0
        row1.operator('wm.url_open', text='Sverchok home page').url = 'http://nikitron.cc.ua/blend_scripts.html'
        row1.operator('wm.url_open', text='Documentation').url = 'http://nikitron.cc.ua/sverch/html/main.html'

        if self.available_new_version:
            row1.operator('node.sverchok_update_addon', text='Upgrade Sverchok addon')
        else:
            row1.operator('node.sverchok_check_for_upgrades_wsha', text='Check for new version')


def register():
    bpy.utils.register_class(SvOverwriteMenuFile)
    bpy.utils.register_class(SvExPipInstall)
    bpy.utils.register_class(SvExEnsurePip)
    bpy.utils.register_class(SvSetFreeCadPath)
    bpy.utils.register_class(SvSelectFreeCadPath)
    bpy.utils.register_class(SverchokPreferences)


def unregister():
    bpy.utils.unregister_class(SverchokPreferences)
    bpy.utils.unregister_class(SvSelectFreeCadPath)
    bpy.utils.unregister_class(SvSetFreeCadPath)
    bpy.utils.unregister_class(SvExEnsurePip)
    bpy.utils.unregister_class(SvExPipInstall)
    bpy.utils.unregister_class(SvOverwriteMenuFile)

if __name__ == '__main__':
    register()