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openidea/wit/fs.wit
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WangTongchaoтаchaoes 3f65cb0f57 feat(plugins): let a plugin write files, inside and outside the project (#2016)
Adds fs.write-file / fs.write-bytes behind a new fs.write:<path> capability (high risk; resolved to the real path, a missing file through its real directory, so a link cannot reach outside the grant; writing doesn't imply reading), and workspace.project.write-file(path, text) behind project.write (medium risk; stays inside the root and creates missing directories).

Writes go through the editor's save path: atomic, keeping the file's encoding and BOM (new files are UTF-8), capped at 16 MiB, and refused while an editor holds unsaved changes for the file. Both capabilities need engines.openidea ^1.3. Tested through the real component (misbehave fixture) and the SDK mock.

Closes #1823
Closes #1824

Co-authored-by: chaoes <[email protected]>
2026-11-07 23:57:13 +08:00

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package openidea:[email protected];
/// Files outside the open projects: the configuration of the program a
/// plugin integrates with, a tool installed elsewhere, a licence file.
///
/// A plugin's own WASI has no preopened directory, so every path here is
/// checked against its `fs.read:<path>` (reading) or `fs.write:<path>`
/// (writing; it doesn't imply reading) grants; without one covering the path a
/// call returns `denied` naming the capability the manifest has to declare. A
/// file inside a project is `workspace.project.read-file` / `write-file`.
/// `path` is absolute, or starts with `~/` for the user's home.
interface fs {
use types.{error};
use workspace.{file-kind, file-stat};
/// A text file, decoded as the editor decodes it (BOM and encoding
/// detection), at most 16 MiB. Unsaved editor contents win, as they do
/// for `project.read-file`.
read-file: func(path: string) -> result<string, error>;
/// The bytes of a file (images, class files, archives), at most 16 MiB.
read-bytes: func(path: string) -> result<list<u8>, error>;
/// Metadata of an existing path, as `project.stat` reports it; a missing
/// path is `not-found`.
stat: func(path: string) -> result<file-stat, error>;
/// An entry of a directory.
record dir-entry {
/// The entry's name, without its directory.
name: string,
kind: file-kind,
}
/// The entries directly under a directory, sorted by name, at most 4096
/// (like `find-files`); a file is `invalid`.
read-dir: func(path: string) -> result<list<dir-entry>, error>;
/// Replaces the text of a file, or creates it, at most 16 MiB: in one step
/// (a reader never sees half of it), keeping the file's encoding and BOM;
/// a new file is UTF-8. `invalid` when the text can't be written in that
/// encoding, the directory is missing, the path is a directory, or an
/// editor holds unsaved changes for the file (save them first).
write-file: func(path: string, text: string) -> result<_, error>;
/// Replaces the bytes of a file, or creates it, at most 16 MiB, in one
/// step; fails like `write-file`.
write-bytes: func(path: string, bytes: list<u8>) -> result<_, error>;
}