├── dune-project
├── exists.md
├── dune
└── README.md


/dune-project:
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1 | (lang dune 2.9)
2 | (using mdx 0.1)
3 | 


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/exists.md:
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1 | Something to be tested
2 | 
3 | ```sh
4 | $ echo "Hello"
5 | Hello
6 | ```
7 | 


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/dune:
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 1 | (library
 2 |  (name mdx_rule_test))
 3 | 
 4 | (rule
 5 |   (target generated.md)
 6 |   (action
 7 |     (progn
 8 |       (write-file i-ran "truly this was executed")
 9 |       (write-file generated.md ""))))
10 | 
11 | (mdx
12 |   (files exists.md generated.md missing.md))
13 | 


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/README.md:
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 1 | mdx-rule-test
 2 | =============
 3 | 
 4 | In dune `(mdx 0.1)` seems to be seriously broken. Try this:
 5 | 
 6 | ```sh
 7 | dune runtest
 8 | ```
 9 | 
10 | 1. `exists.md` gets evaluated fine, so it works
11 | 2. `generated.md` is never generated, the rule never triggers
12 | 3. `missing.md` is never checked, so its absence is never noticed. Probably
13 |    `generated.md` runs into the same issue.
14 | 


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