Darktable plugin to normalize directory path of imported images

normalize-import.lua

--[[
Normalize Import

A simple plugin to normalize directory path (film) of imported images.
When a new image is imported, the plugin immediately moves the new image to the
following normalized directory path:
<photos_path>/YYYY/MM/DD/<image.jpg>

AUTHOR
Bruno Binet <[email protected]>

INSTALLATION
* copy this file in $CONFIGDIR/lua/ where CONFIGDIR is your darktable
configuration directory
* add the following line in the file $CONFIGDIR/luarc require
"normalize-import"

USAGE
* set the <photos_path> directory for storing normalized imported photos in
preferences => lua => Photos path
* import your images as you usually do
* they are automatically moved to the <photos_path> directory

LICENSE
MIT

]]

local dt = require "darktable"
local lfs = require "lfs"


function pathchunks(name)
    local chunks = {}
    for w in string.gmatch(name, "[^/\\]+") do
       table.insert(chunks, 1, w)
    end
    return chunks
end

function mkdir_p(path)
    local chunks = pathchunks(path)
    local originalpath = lfs.currentdir()
    lfs.chdir("/")
    for i=#chunks, 1, -1 do
        local c = chunks[i]
        local exists = lfs.attributes(c) ~= nil
        if(not exists) then
            lfs.mkdir(c)
        end
        lfs.chdir(c)
    end
    lfs.chdir(originalpath)
    return path
end


local function move_image(event, image)
    local Y, m, d, H, M, S = string.match(
      image.exif_datetime_taken, "(%d+):(%d+):(%d+) (%d+):(%d+):(%d+)")
    local lpath = table.concat({Y, m, d,}, '/')
    local photos_path = dt.preferences.read("normalize-import", "photos_path", "directory")
    local abspath = photos_path .. '/' .. lpath
    mkdir_p(abspath)
    local old_film = image.film
    local new_film = dt.films.new(abspath)
    image.move(new_film, image)
    -- print(tostring(image) .. ' ==> ' .. tostring(moved_image))
    if (image.film == old_film) then
        -- image.move has failed
        image.delete(image)
    end
    old_film.delete(old_film)
end

dt.preferences.register("normalize-import", "photos_path",
  "directory", "Base path of the photos collection",
  "Photos will automatically be imported in this directory",
  "~/Photos")
dt.register_event("post-import-image", move_image)