Your first GTM module

Let's create a module named 'hello' that can display 'world'.

1. Start the client: mumps -dir
2. Edit the file "hello": zed "hello"
3. Write this code:  say w "hello",! q
4. Save: :wq
5. Compile: zl
6. Run the code: d say^hello
7. Enjoy !

The code in an indented version

say
  w "hello",!
  q

Here's the session:

#GTM] zed "hello"
[ INSIDE  YOUR $EDITOR ]
[ you save the file    ]
[ and quits the editor ]
#GTM] zl
#GTM] d say^hello
world

#GTM]

Some explanations:

say                   ; Name of the label
  w "hello",!         ; w[rite] the string "hello" followed by end of line: '!'
  q                   ; q[uit] return the control to the caller

You can use the fully qualified name for functions:

say                   ; Name of the label
  write "hello",!     ; w[rite] the string "hello" followed by end of line: '!'
  quit                ; q[uit] return the control to the caller

Egtm (GTM support for Erlang) using UTF-8 chset

If you've already seen this line, you know how this one can be frustrating :)

EGTM Common Error: egtm: 150373066,call^%egtmapi,%GTM-E-INVOBJ, Cannot ZLINK object file due to unexpected format,%GTM-I-TEXT, Object compiled with CHSET=UTF-8 which is different from $ZCHSET

Fighting with GTM to have the UTF8 routines of EGTM, I've finally won the round !
Here's my strategy: in rebar.config add the UTF-8 line ( and set the correct path for your gtm_dist:

{port_envs, [
  %% GT.M flags
  {".*", "gtm_dist", "/opt/application/lib/fis-gtm/V6.0-003_x86_64/utf8"},
  {".*", "gtm_chset", "UTF-8"},
  {".*", "LDFLAGS", "$LDFLAGS -I$gtm_dist -L$gtm_dist -Wl,-rpath -Wl,$gtm_dist -lgtmshr -lc"}
]}.

Then remove the 'egtm_worker.so' from the src directory, and finally recompile:

./rebar comp