Filesystem API

Filesystem helpers are available under ptool.fs and p.fs.

ptool.fs.read

v0.1.0 - Introduced.

ptool.fs.read(path) reads a file as raw bytes and returns a Lua string.

• path (string, required): The file path.
• Returns: string.

Notes:

• The returned Lua string contains the file bytes exactly as stored on disk.
• Text files continue to work as before, but binary files are also supported.

Example:

local content = ptool.fs.read("README.md")
print(content)

local png = ptool.fs.read("logo.png")
print(#png)

ptool.fs.write

v0.1.0 - Introduced.

ptool.fs.write(path, content) writes a Lua string to a file as raw bytes, overwriting existing contents.

• path (string, required): The file path.
• content (string, required): The content to write.

Notes:

• content is written byte-for-byte.
• Embedded NUL bytes and non-UTF-8 bytes are preserved.

Example:

ptool.fs.write("tmp/hello.txt", "hello\n")
ptool.fs.write("tmp/blob.bin", "\x00\xffABC")

ptool.fs.append

v0.8.0 - Introduced.

ptool.fs.append(path, content) appends a Lua string to a file as raw bytes. If the file does not exist, it is created.

• path (string, required): The file path.
• content (string, required): The content to append.

Notes:

• content is written byte-for-byte at the end of the file.
• Embedded NUL bytes and non-UTF-8 bytes are preserved.

Example:

ptool.fs.append("tmp/log.txt", "first line\n")
ptool.fs.append("tmp/log.txt", "second line\n")

ptool.fs.open

v0.8.0 - Introduced.

ptool.fs.open(path[, mode]) opens a local file and returns a File object.

Arguments:

• path (string, required): The file path.
• mode (string, optional): The file mode. Defaults to "r".

Supported modes:

• "r": Open for reading.
• "w": Open for writing, truncating existing contents and creating the file when needed.
• "a": Open for appending, creating the file when needed.
• "r+": Open for reading and writing without truncation.
• "w+": Open for reading and writing, truncating existing contents and creating the file when needed.
• "a+": Open for reading and appending, creating the file when needed.

Notes:

• Modes may include b, such as "rb" or "w+b".
• a and a+ writes always go to the end of the file.

Example:

local file = ptool.fs.open("tmp/log.txt", "a+")
file:write("hello\n")
file:flush()
file:close()

File

v0.8.0 - Introduced.

File represents an open local file handle returned by ptool.fs.open().

It is implemented as a Lua userdata.

Methods:

• file:read([n]) -> string
• file:write(content) -> nil
• file:flush() -> nil
• file:seek([whence[, offset]]) -> integer
• file:close() -> nil

read

v0.8.0 - Introduced.

Canonical API name: ptool.fs.File:read.

file:read([n]) reads bytes from the current file position and returns them as a Lua string.

• n (integer, optional): The maximum number of bytes to read. If omitted, reads from the current file position to EOF.
• Returns: string.

Behavior:

• Returns an empty string at EOF.
• Reads raw bytes, so binary data is preserved exactly.

Example:

local file = ptool.fs.open("README.md")
local prefix = file:read(16)
local rest = file:read()
file:close()

write

v0.8.0 - Introduced.

Canonical API name: ptool.fs.File:write.

file:write(content) writes a Lua string at the current file position.

• content (string, required): The bytes to write.

Behavior:

• Writes raw bytes exactly as provided.
• On append-mode handles, writes are appended to the end of the file.

flush

v0.8.0 - Introduced.

Canonical API name: ptool.fs.File:flush.

file:flush() flushes buffered file writes to the OS.

seek

v0.8.0 - Introduced.

Canonical API name: ptool.fs.File:seek.

file:seek([whence[, offset]]) moves the current file position.

• whence (string, optional): One of "set", "cur", or "end". Defaults to "cur".
• offset (integer, optional): The byte offset relative to whence. Defaults to 0.
• Returns: integer.

Behavior:

• Returns the new absolute file position.
• "set" requires a non-negative offset.

Example:

local file = ptool.fs.open("tmp/data.bin", "w+")
file:write("abcdef")
file:seek("set", 2)
print(file:read(2)) -- cd
file:close()

close

v0.8.0 - Introduced.

Canonical API name: ptool.fs.File:close.

file:close() closes the file handle.

Behavior:

• After closing, the file handle can no longer be used.

ptool.fs.mkdir

v0.1.0 - Introduced.

ptool.fs.mkdir(path) creates a directory. If parent directories do not exist, they are created recursively.

• path (string, required): The directory path.

Example:

ptool.fs.mkdir("tmp/a/b")

ptool.fs.exists

v0.1.0 - Introduced.

ptool.fs.exists(path) checks whether a path exists.

• path (string, required): A file or directory path.
• Returns: boolean.

Example:

if ptool.fs.exists("tmp/hello.txt") then
  print("exists")
end

ptool.fs.is_file

v0.6.0 - Introduced.

ptool.fs.is_file(path) checks whether a path exists and is a regular file.

• path (string, required): The path to check.
• Returns: boolean.

Example:

if ptool.fs.is_file("tmp/hello.txt") then
  print("file")
end

ptool.fs.is_dir

v0.6.0 - Introduced.

ptool.fs.is_dir(path) checks whether a path exists and is a directory.

• path (string, required): The path to check.
• Returns: boolean.

Example:

if ptool.fs.is_dir("tmp") then
  print("dir")
end

ptool.fs.remove

v0.6.0 - Introduced.

ptool.fs.remove(path[, options]) removes a file, symlink, or directory.

• path (string, required): The path to remove.
• options (table, optional): Remove options. Supported fields:
  • recursive (boolean, optional): Whether to remove directories recursively. Defaults to false.
  • missing_ok (boolean, optional): Whether to ignore missing paths. Defaults to false.

Behavior:

• Files and symlinks can be removed without recursive.
• Directories require recursive = true when they are not empty.
• Unknown option names or invalid option value types raise an error.

Example:

ptool.fs.remove("tmp/hello.txt")
ptool.fs.remove("tmp/cache", { recursive = true })
ptool.fs.remove("tmp/missing.txt", { missing_ok = true })

ptool.fs.glob

v0.2.0 - Introduced. v0.5.0 - Added the working_dir option.

ptool.fs.glob(pattern[, options]) matches filesystem paths using Unix-style glob syntax and returns a string array of matched paths sorted lexicographically.

• pattern (string, required): A glob pattern. Relative patterns are resolved from the current ptool runtime directory, so they follow ptool.cd(...).
• options (table, optional): Glob options. Supported fields:
  • working_dir (string, optional): Override the base directory used to resolve relative patterns. Relative working_dir values are resolved from the current ptool runtime directory.
• Returns: string[].
• Hidden files and directories are matched only when the corresponding pattern component explicitly starts with ..

Example:

ptool.cd("src")

local rust_files = ptool.fs.glob("**/*.rs")
local hidden = ptool.fs.glob("**/.secret/*.txt")
local lua_scripts = ptool.fs.glob("**/*.lua", {
  working_dir = "../scripts",
})