Re: [Haskell-cafe] What features should an (fictitious) IDE for Haskell have?

7 Dec 2020

      Speak of this detection by hlint, I can not figure out how I'm supposed to improve it for identical or nearly identical where clauses, e.g.

```log
Reduce duplication
Found:
	!eac = el'context eas
	diags = el'ctx'diags eac
	returnAsExpr = el'Exit eas exit $ EL'Expr xsrc

Why not:
  Combine with /xxx/Analyze.hs:741:7-27
hlint(Reduce duplication)
```

While yes, that's verbatim copy as of a where clause, but how to *combine* them?

```hs
    where
      !eac = el'context eas
      diags = el'ctx'diags eac
      returnAsExpr = el'Exit eas exit $ EL'Expr xsrc
```

Regards,
Compl
...
On 2020-12-07, at 21:32, Doug Burke  wrote:
hlint does this to some extent (at least I have some copy-pasted code it keeps on pleading me to remove duplication).
Doug
On Mon, Dec 7, 2020 at 8:24 AM Johannes Waldmann mailto:johannes.waldmann@htwk-leipzig.de> wrote:
...
very cool feature would be if I could select a program phrase
and let it find /similar/ phrases, where a similarity metric
could be edit-distance with respect to language tokens ...
I often wanted a tool that finds (nearly) duplicate AST sub-trees
in a large code base, and suggests refactorings.
Of course, in an IDE, it could alert me on-the-fly
that I'm typing some code that's already present elsewhere.
How might one go about implementing this?
Actual (approximate) sub-tree matching seems the easy part;
but I have no clear idea about whether this
should just use syntax, or needs types as well (my guess is: yes)
what libraries are there to provide the (annotated) ASTs, etc.
- J.W.
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Re: [Haskell-cafe] What features should an (fictitious) IDE for Haskell have?

YueCompl