Crash in (load-pagetree "../index.ptree") with "find-relative-path: contract violation"

[pmarinov]

Hello,

My pollen.rkt is: https://github.com/pmarinov/bash-scripting-guide/blob/master/pollen.rkt

I get this error backtrace:

find-relative-path: contract violation
  expected: (and/c path-for-some-system? simple-form?)
  given: #<path:/home/peterm/work/bash-scripting-guide/pages/../index.ptree>
  context...:
   /usr/share/racket/collects/racket/path.rkt:118:2: for-loop
   /usr/share/racket/collects/racket/path.rkt:116:0: do-explode-path
   /usr/share/racket/collects/racket/path.rkt:126:0: find-relative-path9
   /home/peterm/.racket/7.2/pkgs/pollen/pollen/cache.rkt:50:9: convert-path-to-cache-record
   /home/peterm/.racket/7.2/pkgs/pollen/pollen/private/cache-utils.rkt:124:2: generate-dest-file
   /usr/share/racket/collects/file/cache.rkt:63:2: fetch-and-continue
   /usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:430:3
   /home/peterm/.racket/7.2/pkgs/pollen/pollen/private/cache-utils.rkt:114:0: cache-ref!11
   /usr/share/racket/collects/racket/private/more-scheme.rkt:376:2: hash-ref!
   /home/peterm/.racket/7.2/pkgs/pollen/pollen/cache.rkt:39:4: cached-require-base
   /home/peterm/work/bash-scripting-guide/pollen.rkt:148:0: node-menu
   (submod "/home/peterm/work/bash-scripting-guide/pages/commands.poly.pm" pollen-module): [running body]
   temp37_0
   for-loop
   run-module-instance!125
   for-loop
   ...
make: *** [makefile:39: pages/command_substit.html] Error 1

Observations of strangeness, this error wouldn't show up if:

• I manually do: raco pollen render -r html pages/commands.poly.pm OR
• I re-order my index.ptree OR
• If I remove subtree pages/commands.poly.pm from index.ptree OR
• If in folder "pages" I do ln -s ../index.ptree index.ptree and in function node-menu I pass "index.ptree" not "../index.ptree"

I run raco pollen reset before each of the observations above. Any single step will make the problem not show up.

This code (pollen.rkt) has been working for a long time and I have been simply adding pages to the book (index.ptree), and now suddenly it complains.

What could be the problem? Thank you for taking the time to look into it.

[mbutterick]

has been working for a long time and I have been simply adding pages to the book (index.ptree), and now suddenly it complains

What changed? Did you update Pollen or Racket or any other underlying pieces?

[pmarinov]

The new thing is that I had added this at the end of index.ptree:

◊pages/commands.poly.pm{
  pages/commands_internal.poly.pm
}

The function (node-menu) is invoked in many pages prior commands.poly.pm. If I remove the call to (node-menu) from this page specifically the project also compiles successfully.

The strange thing is if I add it to any other part of index.ptree the project compiles (I do "pollen reset" between these experiments)

Otherwise, I've updated the machine a few weeks ago, but I believe I did a "pollen reset" after that.

[mbutterick]

OK, thanks for the report. I’ve pushed a fix for this issue.

[pmarinov]

It works.

I did:

$ raco pkg update pollen
$ raco pollen reset
$ make all

And my project compiled.

Thank you for the fix. Thank you for making Pollen.