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kcl.mod: The KCL package Manifest File

The Manifest

The kcl.mod file for each module is called its manifest. It is written in the TOML format. It contains metadata that is needed to compile the module.

In the MVP version, the sections we plan to support are as follows:

  • Package metadata:
    • package - Defines a package.
      • name — The name of the package.
      • version — The version of the package.
      • edition — The KCL compiler edition.
  • Dependency tables:
  • Compiler settings:
    • [profile] - The compiler settings.
      • entries - The entry points of the package when compiling.

package

The first section in a kcl.mod is [package].

[package]
name = "hello_world" # the name of the package
version = "0.1.0"    # the current version, obeying semver
edition = "0.5.0"    # the KCL compiler version

dependencies

Your kcl package can depend on other libraries from OCI registries, git repositories, or subdirectories on your local file system.

You can specify a dependency by following:

[dependencies]
<package name> = <package_version>

You can specify a dependency from git repository.

[dependencies]
<package name> = { git = "<git repo url>", tag = "<git repo tag>" }

You can specify a dependency from local file path.

# Find the kcl.mod under "./xxx/xxx".
[dependencies]
<package name> = {path = "<package local path>"}

entries

You can specify the entry points of the package when compiling.

entries is a sub section of profile section.

[profile]
entries = [
   ...
]

entries is the relative path of kcl package root path, the kcl.mod file path is the package root path. There are two types of file paths formats supported, normal paths and mod relative paths.

  • normal path: The path is relative to the current package root path.
  • mod relative path: The path is relative to the vendor package root path that can be found by the section dependencies in kcl.mod file.

For example:

  1. If the kcl.mod is localed in /usr/my_pkg/kcl.mod, kpm run will take /usr/my_pkg/entry1.k and /usr/my_pkg/subdir/entry2.k as the entry point of the kcl compiler.
entries = [
   "entry1.k",
   "subdir/entry2.k",
]
  1. If the kcl.mod is localed in /usr/my_pkg/kcl.mod, and the current kcl package depends on the kcl package k8s. You can use the mod relative paths the take the kcl file in the package k8s as the entry point of the kcl compiler.
entries = [
   "entry1.k",
   "subdir/entry2.k",
   "${k8s:KCL_MOD}/core/api/v1/deployment.k"
]

The mod relative paths must contains the preffix ${k8s:KCL_MOD}, k8s is the package name, ${k8s:KCL_MOD} means the package root path of the package k8s. Therefore, if the package root path of k8s is /.kcl/kpm/k8s, the entries show above will take /usr/my_pkg/entry1.k, /usr/my_pkg/subdir/entry2.k and /.kcl/kpm/k8s/core/api/v1/deployment.k as the entry point of the kcl compiler.

Note

You can use normal path to specify the compilation entry point in the current package path, and use mod relative path to specify the entry point in a third-party package.

Therefore, the file path specified by normal path must come from the same package, that is, the kcl.mod path found from the normal path must only find one kcl.mod file, otherwise the compiler will output an error.

For example:

In the path /usr/kcl1:

/usr/kcl1
      |--- kcl.mod
      |--- entry1.k

In the path /usr/kcl2:

/usr/kcl2
      |--- kcl.mod
      |--- entry2.k

If you compile with this kcl.mod in the path /usr/kcl1:

entries = [
   "entry1.k", # The corresponding kcl.mod file is /usr/kcl1/kcl.mod
   "/usr/kcl2/entry2.k", # The corresponding kcl.mod file is /usr/kcl2/kcl.mod
]

You will get an error:

error[E3M38]: conflict kcl.mod file paths