koreader/plugins/exporter.koplugin/target/json.lua

local Device = require("device")
local rapidjson = require("rapidjson")

-- json exporter
local JsonExporter = require("base"):new {
    name = "json",
    shareable = Device:canShareText(),
}

local function format(booknotes)
    local t = {
        title = booknotes.title,
        author = booknotes.author,
        entries = {},
        exported = booknotes.exported,
        file = booknotes.file
    }
    for _, entry in ipairs(booknotes) do
        table.insert(t.entries, entry[1])
    end
    return t
end

function JsonExporter:export(t)
    local exportable
    local timestamp = self.timestamp or os.time()
    local path = self:getFilePath(t)
    if #t == 1 then
        exportable = format(t[1])
        exportable.created_on = timestamp
        exportable.version = self:getVersion()
    else
        local documents = {}
        for _, booknotes in ipairs(t) do
            table.insert(documents, format(booknotes))
        end
        exportable = {
            created_on = timestamp,
            version = self:getVersion(),
            documents = documents
        }
    end
    local file = io.open(path, "w")
    if not file then return false end
    file:write(rapidjson.encode(exportable, {pretty = true}))
    file:write("\n")
    file:close()
    return true
end

function JsonExporter:share(t)
    local content = format(t)
    content.created_on = self.timestamp or os.time()
    content.version = self:getVersion()
    Device:doShareText(rapidjson.encode(content, {pretty = true}))
end

return JsonExporter