Re: [Orgmode] [Babel] Marker does not point anywhere (when session buffer needs to be created)

[Eric Schulte]

Hi Seb,

This "mark doesn't point anywhere" error is common across a bunch of
sessions (ruby and python as well as shell).  It's simply a matter of
Babel trying to use the session before it is ready.  I haven't found
these errors to be an issue as all subsequent use of the session works
as expected.  I suppose that we should try to be more careful on session
creation explicitly waiting until the buffer is ready, however this
would add some degree of complication to the code...

Thanks -- Eric

Sébastien Vauban <address@hidden> writes:

> * Marker does not point anywhere
>
> Executing the following:
>
> #+begin_src sh :session NoSuchSessionYet
> cd ~
> ls *.txt
> #+end_src
>
> outputs this in *Messages*:
>
> : executing Sh code block...
> : think it is Cygwin...
> : ~ 
> : ansi-color-process-output: Marker does not point anywhere
>
> when executed for the *first* time. All subsequent executions don't exhibit
> this error (currently, they hang, but that's another story).
>
> My prompt is colored -- I need it, really!  *None* of the =ls= results are
> colored, though (in this above case: =ls ~/*.txt=).
>
> Can we fix this somehow?
>
> Test the following, and you'll see you need a colored prompt as well, if not
> yet convinced:
>
> #+begin_src sh :tangle .sva-bashrc
> #*** Controlling the Prompt
>
> # define some colors
> RED='\e[1;31m'
> GREEN='\e[1;32m'
> NO_COLOR='\e[0m'
>
> # my format of the prompt
> function my_prompt_command ()
> {
>     # colorful prompt, based on whether the previous command succeeded or not
>     if [[ $? -eq 0 ]]; then
>         HILIT=${GREEN}
>     else
>         HILIT=${RED}
>     fi
>
>     # replace the $HOME prefix by ~ in the current directory
>     if [[ $HOME == ${PWD:0:${#HOME}} ]]; then
>         NEWPWD="~${PWD:${#HOME}}"
>     else
>         NEWPWD=$PWD
>     fi
>
>     # how many characters of the $PWD should be kept
>     local pwd_max_length=15
>
>     if [[ ${#NEWPWD} -gt $pwd_max_length ]]; then
>         local pwd_offset=$(( ${#NEWPWD} - $pwd_max_length ))
>         NEWPWD="...${NEWPWD:$pwd_offset:$pwd_max_length}"
>     fi
>
>     # prompt character
>     if [[ $(whoami) = "root" ]]; then
>         local PROMPTCHAR="#"
>     else
>         local PROMPTCHAR=">"
>     fi
>
>     case $TERM in
>         dumb)  # for Tramp?
>             setenv PS1 "address@hidden ${NEWPWD}${PROMPTCHAR}"
>             ;;
>         *)
>             setenv PS1 "address@hidden ${NEWPWD}${PROMPTCHAR}\[${NO_COLOR}\]"
>             ;;
>     esac
> }
>
> # shell prompt
> setenv PROMPT_COMMAND my_prompt_command
> echo ""
> #+end_src
>
> Best regards,
>   Seb