Question

我正在尝试创建自己的Julia包。

首先，我使用beforeValue创建包：

fun main() {
    val model = Model(File("file.txt"))
    val gson = GsonBuilder().registerTypeAdapter(File::class.java, Adapter()).create()
    // System.out just for PoC, don't try with large files because output will be massive
    gson.toJson(model, System.out)
}

data class Model(@SerializedName("file") val file: File)

class Adapter : TypeAdapter<File>() {
    override fun write(out: JsonWriter, value: File) {
        Base64InputStream(FileInputStream(value), true, 0, null).use { 
            out.writeFromStream(it)
        }
    }

    override fun read(`in`: JsonReader): File {
        throw UnsupportedOperationException()
    }

    // JsonWriter only offers value(String), which would need you to load the whole file to the memory.
    private fun JsonWriter.writeFromStream(inputStream: InputStream) {
        val declaredField = javaClass.getDeclaredField("out")
        val deferredName = javaClass.getDeclaredMethod("writeDeferredName")
        val beforeValue = javaClass.getDeclaredMethod("beforeValue")

        declaredField.isAccessible = true
        deferredName.isAccessible = true
        beforeValue.isAccessible = true

        val actualWriter = declaredField.get(this) as Writer

        deferredName.invoke(this)
        beforeValue.invoke(this)
        actualWriter.write("\"")
        for (byte in inputStream.buffered()) {
            actualWriter.write(byte.toInt())
        }
        actualWriter.write("\"")
    }
}

然后我generate打包，以便添加一些依赖项：

(v1.0) pkg> generate Example
Generating project Example:
    Example/Project.toml
    Example/src/Example.jl

现在，我想回到默认环境。我尝试了以下命令：

activate

但是现在看来我的环境是空的！发生了什么事？

Answer 1

要返回默认环境，请使用不带参数的(v1.0) pkg> activate Example Activating environment at `~/Example/Project.toml` (Example) pkg> add Unicode Resolving package versions... Updating `~/Example/Project.toml` [4ec0a83e] + Unicode Updating `~/Example/Manifest.toml` [4ec0a83e] + Unicode：

(v1.0) pkg> activate v1.0
Activating new environment at `~/v1.0/Project.toml`

请注意，反馈与失败的尝试不同：打印的路径不同。

activate将参数解释为文件系统路径。因此，(Example) pkg> activate Activating environment at `~/.julia/environments/v1.2/Project.toml`激活了一个新环境，将其存储在activate上，这不是本意。

您可以使用内置的pkg> activate v1.0命令来进一步了解~/v1.0/Project.toml：

activate

如何激活默认环境？

1 个答案: