dash-wasm -- WebAssembly dash shell for servers and browsers (pre-alpha version

This provides the dash shell compiled to WebAssembly, suitable for use in a nodejs program or in a web browser. Try this in your browser right now:

LIVE DEMO: https://cowasm.sh

Here is a little demo below, illustrating that Lua, sqlite, tar, and Python 3.11 (with numpy!) are all included, among other things. Do NOT get your hopes up and expect this to work well, since there are many remaining issues!

See https://github.com/sagemathinc/cowasm if you're interested in this project, and in particular the dash package.

~ $ npx dash-wasm@latest
(CoWasm) sh$ echo $PATH
/cowasm/usr/bin
(CoWasm) sh$ python      
Python 3.11.0 (main, Nov  2 2022, 12:26:39) [Clang 15.0.3 (git@github.com:ziglang/zig-bootstrap.git 85033a9aa569b41658404d0e on wasi
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> numpy.random.rand(2,2)
array([[0.61989363, 0.33999592],
       [0.86028145, 0.78855092]])
>>> ^D
(CoWasm) sh$ ls $PATH
basename cut      false    join     mktemp   realpath sqlite3  tsort    xargs
bzip2    date     find     less     mv       rm       stat     tty      yes
cat      dirname  fmt      ln       nl       rmdir    tail     uname
chmod    du       fold     logname  paste    rogue    tar      unexpand
clear    env      grep     ls       pathchk  seq      tee      uniq
comm     expand   hanoi    lua      pr       sh       test     viz
cp       expr     head     man      python   sleep    touch    wc
csplit   factor   id       mkdir    readlink sort     tr       which
(CoWasm) sh$ lua
Lua 5.4.4  Copyright (C) 1994-2022 Lua.org, PUC-Rio
> 2 + 3
5
> ^D
(CoWasm) sh$ sqlite3
SQLite version 3.39.4 2022-09-29 15:55:41
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> select 2+3;
5
sqlite> ^D
(CoWasm) sh$ echo $((2+3))
5
(CoWasm) sh$ rogue
...
You hit.  Defeated the kobold
          -------
          |.....+############ ---------------------
          |.....|           # |...........*.......+
          -----+-           ##+........]..........|
               #              ---------------------
               ######
                    #
                 ---@---
                 |..*B.|
                 |.....+
                 |.....|
                 |.....|
                 -+-----
(CoWasm) sh$ stat $PATH/tar
0 62 ---------- 1 (0) (0) 0 743701 "Oct 29 17:19:15 2022" "Oct 29 17:19:15 2022" "Oct 29 17:19:15 2022" 0 0 /cowasm/bin/tar
(CoWasm) sh$ tar --help
tar(bsdtar): manipulate archive files
First option must be a mode specifier:
  -c Create  -r Add/Replace  -t List  -u Update  -x Extract
Common Options:
  -b #  Use # 512-byte records per I/O block
  -f <filename>  Location of archive (default /dev/tape)
  -v    Verbose
  -w    Interactive
Create: tar -c [options] [<file> | <dir> | @<archive> | -C <dir> ]
  <file>, <dir>  add these items to archive
  -z, -j, -J, --lzma  Compress archive with gzip/bzip2/xz/lzma
  --format {ustar|pax|cpio|shar}  Select archive format
  --exclude <pattern>  Skip files that match pattern
  -C <dir>  Change to <dir> before processing remaining files
  @<archive>  Add entries from <archive> to output
List: tar -t [options] [<patterns>]
  <patterns>  If specified, list only entries that match
Extract: tar -x [options] [<patterns>]
  <patterns>  If specified, extract only entries that match
  -k    Keep (don't overwrite) existing files
  -m    Don't restore modification times
  -O    Write entries to stdout, don't restore to disk
  -p    Restore permissions (including ACLs, owner, file flags)
bsdtar 3.6.1 - libarchive 3.6.1 zlib/1.2.13 liblzma/5.0.4 bz2lib/1.0.8 

You can also run native executables if you give the exact path (or add them to PATH):

~/cowasm/packages/dash-wasm$ ./bin/dash-wasm 
(CoWasm) sh$ /usr/bin/python3
Python 3.9.6 (default, Sep 13 2022, 22:03:16) 
[Clang 14.0.0 (clang-1400.0.29.102)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^D

Piping and indirection is not implemented yet.