Hilbish/golibs/fs/fs.go

338 lines
8.5 KiB
Go

// filesystem interaction and functionality library
/*
The fs module provides filesystem functions to Hilbish. While Lua's standard
library has some I/O functions, they're missing a lot of the basics. The `fs`
library offers more functions and will work on any operating system Hilbish does.
#field pathSep The operating system's path separator.
*/
package fs
import (
"fmt"
"path/filepath"
"strconv"
"os"
"strings"
"hilbish/moonlight"
"hilbish/util"
rt "github.com/arnodel/golua/runtime"
"github.com/arnodel/golua/lib/iolib"
"mvdan.cc/sh/v3/interp"
)
type fs struct{
runner *interp.Runner
}
func New(runner *interp.Runner) *fs {
return &fs{
runner: runner,
}
}
func (f *fs) Loader(rtm *moonlight.Runtime) moonlight.Value {
exports := map[string]moonlight.Export{
/*
"cd": util.LuaExport{f.fcd, 1, false},
"mkdir": util.LuaExport{f.fmkdir, 2, false},
"stat": util.LuaExport{f.fstat, 1, false},
*/
"readdir": {f.freaddir, 1, false},
/*
"abs": util.LuaExport{f.fabs, 1, false},
"basename": util.LuaExport{f.fbasename, 1, false},
*/
"dir": {f.fdir, 1, false},
/*
"glob": util.LuaExport{f.fglob, 1, false},
"join": util.LuaExport{f.fjoin, 0, true},
"pipe": util.LuaExport{f.fpipe, 0, false},
*/
}
mod := moonlight.NewTable()
rtm.SetExports(mod, exports)
mod.SetField("pathSep", moonlight.StringValue(string(os.PathSeparator)))
mod.SetField("pathListSep", moonlight.StringValue(string(os.PathListSeparator)))
return moonlight.TableValue(mod)
}
// abs(path) -> string
// Returns an absolute version of the `path`.
// This can be used to resolve short paths like `..` to `/home/user`.
// #param path string
// #returns string
func (f *fs) fabs(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
path, err := c.StringArg(0)
if err != nil {
return nil, err
}
path = util.ExpandHome(path)
abspath, err := filepath.Abs(path)
if err != nil {
return nil, err
}
return c.PushingNext1(t.Runtime, rt.StringValue(abspath)), nil
}
// basename(path) -> string
// Returns the "basename," or the last part of the provided `path`. If path is empty,
// `.` will be returned.
// #param path string Path to get the base name of.
// #returns string
func (f *fs) fbasename(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.Check1Arg(); err != nil {
return nil, err
}
path, err := c.StringArg(0)
if err != nil {
return nil, err
}
return c.PushingNext(t.Runtime, rt.StringValue(filepath.Base(path))), nil
}
// cd(dir)
// Changes Hilbish's directory to `dir`.
// #param dir string Path to change directory to.
func (f *fs) fcd(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.Check1Arg(); err != nil {
return nil, err
}
path, err := c.StringArg(0)
if err != nil {
return nil, err
}
path = util.ExpandHome(strings.TrimSpace(path))
err = os.Chdir(path)
if err != nil {
return nil, err
}
interp.Dir(path)(f.runner)
return c.Next(), err
}
// dir(path) -> string
// Returns the directory part of `path`. If a file path like
// `~/Documents/doc.txt` then this function will return `~/Documents`.
// #param path string Path to get the directory for.
// #returns string
func (f *fs) fdir(mlr *moonlight.Runtime, c *moonlight.GoCont) (moonlight.Cont, error) {
if err := mlr.Check1Arg(c); err != nil {
return nil, err
}
path, err := mlr.StringArg(c, 0)
if err != nil {
return nil, err
}
next := mlr.PushNext1(c, moonlight.StringValue(filepath.Dir(path)))
return next, nil
}
// glob(pattern) -> matches (table)
// Match all files based on the provided `pattern`.
// For the syntax' refer to Go's filepath.Match function: https://pkg.go.dev/path/filepath#Match
// #param pattern string Pattern to compare files with.
// #returns table A list of file names/paths that match.
/*
#example
--[[
Within a folder that contains the following files:
a.txt
init.lua
code.lua
doc.pdf
]]--
local matches = fs.glob './*.lua'
print(matches)
-- -> {'init.lua', 'code.lua'}
#example
*/
func (f *fs) fglob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.Check1Arg(); err != nil {
return nil, err
}
pattern, err := c.StringArg(0)
if err != nil {
return nil, err
}
matches, err := filepath.Glob(pattern)
if err != nil {
return nil, err
}
luaMatches := rt.NewTable()
for i, match := range matches {
luaMatches.Set(rt.IntValue(int64(i + 1)), rt.StringValue(match))
}
return c.PushingNext(t.Runtime, rt.TableValue(luaMatches)), nil
}
// join(...path) -> string
// Takes any list of paths and joins them based on the operating system's path separator.
// #param path ...string Paths to join together
// #returns string The joined path.
/*
#example
-- This prints the directory for Hilbish's config!
print(fs.join(hilbish.userDir.config, 'hilbish'))
-- -> '/home/user/.config/hilbish' on Linux
#example
*/
func (f *fs) fjoin(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
strs := make([]string, len(c.Etc()))
for i, v := range c.Etc() {
if v.Type() != rt.StringType {
// +2; go indexes of 0 and first arg from above
return nil, fmt.Errorf("bad argument #%d to run (expected string, got %s)", i + 1, v.TypeName())
}
strs[i] = v.AsString()
}
res := filepath.Join(strs...)
return c.PushingNext(t.Runtime, rt.StringValue(res)), nil
}
// mkdir(name, recursive)
// Creates a new directory with the provided `name`.
// With `recursive`, mkdir will create parent directories.
// #param name string Name of the directory
// #param recursive boolean Whether to create parent directories for the provided name
/*
#example
-- This will create the directory foo, then create the directory bar in the
-- foo directory. If recursive is false in this case, it will fail.
fs.mkdir('./foo/bar', true)
#example
*/
func (f *fs) fmkdir(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.CheckNArgs(2); err != nil {
return nil, err
}
path, err := c.StringArg(0)
if err != nil {
return nil, err
}
recursive, err := c.BoolArg(1)
if err != nil {
return nil, err
}
path = util.ExpandHome(strings.TrimSpace(path))
if recursive {
err = os.MkdirAll(path, 0744)
} else {
err = os.Mkdir(path, 0744)
}
if err != nil {
return nil, err
}
return c.Next(), err
}
// fpipe() -> File, File
// Returns a pair of connected files, also known as a pipe.
// The type returned is a Lua file, same as returned from `io` functions.
// #returns File
// #returns File
func (f *fs) fpipe(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
rf, wf, err := os.Pipe()
if err != nil {
return nil, err
}
rfLua := iolib.NewFile(rf, 0)
wfLua := iolib.NewFile(wf, 0)
return c.PushingNext(t.Runtime, rfLua.Value(t.Runtime), wfLua.Value(t.Runtime)), nil
}
// readdir(path) -> table[string]
// Returns a list of all files and directories in the provided path.
// #param dir string
// #returns table
func (f *fs) freaddir(mlr *moonlight.Runtime, c *moonlight.GoCont) (moonlight.Cont, error) {
if err := mlr.Check1Arg(c); err != nil {
return nil, err
}
dir, err := mlr.StringArg(c, 0)
if err != nil {
return nil, err
}
dir = util.ExpandHome(dir)
names := moonlight.NewTable()
dirEntries, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
for i, entry := range dirEntries {
names.Set(moonlight.IntValue(int64(i + 1)), moonlight.StringValue(entry.Name()))
}
return mlr.PushNext1(c, moonlight.TableValue(names)), nil
}
// stat(path) -> {}
// Returns the information about a given `path`.
// The returned table contains the following values:
// name (string) - Name of the path
// size (number) - Size of the path in bytes
// mode (string) - Unix permission mode in an octal format string (with leading 0)
// isDir (boolean) - If the path is a directory
// #param path string
// #returns table
/*
#example
local inspect = require 'inspect'
local stat = fs.stat '~'
print(inspect(stat))
--[[
Would print the following:
{
isDir = true,
mode = "0755",
name = "username",
size = 12288
}
]]--
#example
*/
func (f *fs) fstat(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
if err := c.Check1Arg(); err != nil {
return nil, err
}
path, err := c.StringArg(0)
if err != nil {
return nil, err
}
path = util.ExpandHome(path)
pathinfo, err := os.Stat(path)
if err != nil {
return nil, err
}
statTbl := rt.NewTable()
statTbl.Set(rt.StringValue("name"), rt.StringValue(pathinfo.Name()))
statTbl.Set(rt.StringValue("size"), rt.IntValue(pathinfo.Size()))
statTbl.Set(rt.StringValue("mode"), rt.StringValue("0" + strconv.FormatInt(int64(pathinfo.Mode().Perm()), 8)))
statTbl.Set(rt.StringValue("isDir"), rt.BoolValue(pathinfo.IsDir()))
return c.PushingNext1(t.Runtime, rt.TableValue(statTbl)), nil
}