As part of our
announcement of open sourcing ide-backend, there was a video demonstrating
a tool called “fpview” (that was our internal name for this
Like many of our tools, after some internal development, we're
now releasing it open source here at: stackage-view.
It looks like this:
The README documents the features, but here's a quick
- Go to definition: You can double-click any identifier to jump
straight to the definition.
- Type information of any expression or pattern binding. Just
click any identifier to see its type. Alternatively, you can select
an expression to see the type of that. Hitting the
<-> expansion button will expand the selection
to a parent node.
The first purpose behind the tool was to target general teams of
people who may not all be using the same tooling (Haskellers are
like cats, they prefer to do their own thing!), some users may be
on Emacs, Vim, or Sublime, FP Eclipse, Leksah, etc. whereas this
read-only tool serves as a way to inspect a codebase with handy
information and jumping available.
The second purpose was to serve as a demonstration and acid test
for our combination GHCJS and React library ghcjs-react. It makes for
a nice simple-but-non-trivial demonstration of the library. There
is real-world state handling going on, interacting with third-party
APIs (aside from React itself, the Ace editor).
It also serves as a demonstration of using
ide-backend programmatically. If you look in the
source of stackage-view you'll see it's quite straight-forward to
use. To build it, you will need the Git version of ide-backend
Currently it cannot be uploaded to Hackage due to an issue
with the -dynamic flag.
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