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View Code? Open in Web Editor NEWCompany-mode completion back-end for haskell-mode via ghc-mod
Company-mode completion back-end for haskell-mode via ghc-mod
* company-ghc backend found: company-ghc
* automatic scan module is enabled
* ghc-boot process has not been done
Module Alias Candidates
-------------------------------------------------------------------------------
Prelude - nil
As the diag above, though company-ghc is added to backend, ghc-boot process cannot been done. What should I do?
My config:
(add-to-list 'company-backends 'company-ghc)
(set-company-backend! 'haskell-mode
'company-ghc)
(add-hook 'haskell-mode-hook 'eglot-ensure)
Hey,
this looks really awesome, adding a company backend for ghc-mod has been on my TODO list for ages now, looks like you did it better than I could have if i tried ;) I'm one of the maintainers of ghc-mod and I was wondering if you might want this to be merged into ghc-mod itself? We're about to do some major elisp code cleanup so this might be just the right time to do it if you want to.
If I’m typing a word, and the Company-Mode completions pop-up appears,
and the active completion back-end is company-ghc
, the completions
pop-up appears to be properly populated, but it disappears soon after
appearing, and the following error message is logged:
Company: An error occurred in post-command
Company: Front-end company-echo-metadata-frontend error "Company: Back-end company-ghc error "Wrong type argument: stringp, nil" with args (meta putChar)" on command post-command
company-ghc-diagnose
’s output seems fine:
* company-ghc backend found: company-ghc
* automatic scan module is enabled
* ghc-boot process has been done
Module Alias Candidates
-------------------------------------------------------------------------------
Prelude - 212
Hi,
company-ghc
works great for autocompleting candidates in Prelude and other modules I import, but for some reason doesn't autocomplete candidates in the file I'm working in. To make a contrived example, when I have the code:
lastDigit :: Integer -> Integer
lastDigit n = n `mod` 10
When I write "las", there's no completion for lastDigit
:
getLastDigit :: Integer -> Integer
getLastDigit n = las...
Is this by design or am I doing something wrong? Thanks in advance for the help, other than with this problem I'm loving company-ghc
:)
Hi there, I am trying to set up company-ghc in Aquamacs and I get this error/warning when starting up aquamacs. Does anyone know what am I missing? Thanks.
Warning (initialization): An error occurred while loading `/Users/yoelusa/.emacs':
Symbol's value as variable is void: company-backends
To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file. Start Emacs with
the `--debug-init' option to view a complete error backtrace.
I have this configuration on ``~/.emacs`
;; Melpa
(require 'package)
(add-to-list 'package-archives
'("melpa" . "http://melpa-stable.milkbox.net/packages/"))
(package-initialize)
(autoload 'ghc-init "ghc" nil t)
(autoload 'ghc-debug "ghc" nil t)
(autoload 'company-mode "company" nil t)
(add-hook 'haskell-mode-hook (lambda () (ghc-init)))
(add-hook 'after-init-hook 'global-company-mode)
(add-to-list 'company-backends 'company-ghc)
The company-ghc-diagnostic-info
cmd shows this
* company-ghc backend not found
* automatic scan module is disabled.
You need to run either 'M-x company-ghc-turn-on-autoscan' once
or 'M-x company-ghc-scan-modules' when it is necessary.
* ghc-boot process has been done
Module Alias Candidates
-------------------------------------------------------------------------------
The ghc-debug
cmd shows this
...
Version: all versions must be the same.
ghc.el version 0
ghc-mod version 4.1.6 compiled by GHC 7.8.3
ghc-modi version 4.1.6 compiled by GHC 7.8.3
The Glorious Glasgow Haskell Compilation System, version 7.8.3
...
Citing from the the tool's site [1]:
Company-flex only works with the company-capf backend. Most sources use this backend, with the exception of the more advanced sources. Most backends should be re-written in terms of completion-at-point-functions eventually, although it's going to take a while.
Is it possible that company-ghc use capf?
I am not sure if I should raise this issue somewhere else, but company-mode
seems to conflict with haskell-interactive-mode
.
To reproduce:
(setq debug-on-error t)
haskell-mode
, type something, company
is working finehaskell-process-load-or-reload
, and enter haskell-interactive-mode
haskell-mode
, in the beginning of line ,type something, debugger window pops out.The abridged error message in my case is below:
Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
haskell-interactive-at-prompt()
haskell-interactive-mode-completion-at-point-function()
completion--capf-wrapper(haskell-interactive-mode-completion-at-point-function optimist)
run-hook-wrapped(completion--capf-wrapper haskell-interactive-mode-completion-at-point-function optimist)
company--capf-data()
company-capf(prefix)
#[0 "\n\203 ...
company--begin-new()
company--perform()
#0 "\300 \207" [company--perform] 1 "\n\n(fn)"
funcall(#[0 "\300 \207" [company--perform] 1 "\n\n(fn)"])
company-auto-begin()
company-idle-begin(# #<window 3 on Main.hs> 2490 3405)
apply(company-idle-begin (# #<window 3 on Main.hs> 2490 3405))
byte-code("r\301�\302H�\303H"\210)\301\207" [timer apply 5 6] 4)
timer-event-handler([t 21441 4252 273797 nil company-idle-begin (# #<window 3 on Main.hs> 2490 3405) nil 0])
read-event(nil t 3)
sit-for(3)
flyspell-check-word-p()
byte-code("\306� ...
flyspell-post-command-hook()
Hi there,
It looks like the MELPA package is gone:
https://melpa.org/#/company-ghc
FWIW the "haskell" layer of Spacemacs seems to pull that package (and fails at doing so)
I'd like to be able to type something like C.M.Re
and get Control.Monad.Reader
. Or rather, C.M
and have Control.Monad
show up in the completion list.
If I understood the code correctly, this requires us not to use all-completions
.
This might be an edge case, and might also be doable by other means, but I was hoping you'd be able to help - when my current module isn't compilable, I lose the ability to complete identifiers from the current module. This is a bit jarring. Might it be possible to have a fallback mode where the tokenised words are used as completion sources when ghc-mod fails to parse the file? Can I achieve this goal by some other company-mode plugin?
Hi,
I'm trying to get company-ghc to work, but without success. The diagnostic reports:
* company-ghc backend found: company-ghc
* automatic scan module is enabled
* ghc-boot process seems to have failed
Module Alias Candidates
-------------------------------------------------------------------------------
Prelude - 0
So I applied the recommendations:
inst
and it goes to instance
)ghc-mod boot
on the command line does work and gives a huge list of identifiers% ghc-mod root
/Users/etanter/Develop/Haskell
% boot
% check /Users/etanter/Develop/Haskell/Arboles.hs
% check /Users/etanter/Develop/Haskell/Arboles.hs
I find it strange that it says boot
above and not ghc-mode boot
. Could it be the problem? if so, where to fix that?
If not, any idea? Something I can do to dig into the matter?
thanks!
Hi,
company-ghc
is constantly Loading symbols for XX ...
while I type. Always the same modules (below).
company-ghc-diagnose
:
* company-ghc backend found: (company-ghc :with company-dabbrev-code)
* automatic scan module is enabled
* ghc-boot process has been done
Module Alias Candidates
-------------------------------------------------------------------------------
Types.Plan - nil
Types.MobNet - nil
Types.Invoice - nil
Types.Event - nil
StdImports - 1250
MobNets.Extract - nil
Prelude - 212
diagnose shows several modules with nil
for candidates. Is it my config?
br,
vlatko
Currently, company-ghc borrows ghc-mod variables and modifies them by adding text properties.
It is not polite.
I would like to change it by communicating with ghc-modi
directly via ghc-sync-process
.
Once after ghc-modi
supports "-d" and "-o" options like ghc-mod
, we can remove call of ghc-get-info
and add operators into candidates.
One down side is we may have duplicate set of keywords in ghc-mod and company-ghc.
I am a new emacs user trying to get along with spacemacs. I have ghc-mod
installed. When I run company-ghc-diagnose
, I see this output:
* company-ghc backend not found
* automatic scan module is disabled.
You need to run either 'M-x company-ghc-turn-on-autoscan' once
or 'M-x company-ghc-scan-modules' when it is necessary.
* ghc-boot process has not been done
I am hoping some documentation can be added to the Diagnostic section of the README for a next step to resolve this issue.
In spacemacs
with stack
(I don't know if this is related to how ghc-mod
integrates stack
), the completion will be unbearably slow as soon as the import list is too big (~ 25 items).
Is there any known trick to avoid the problem (apart from disabling company-ghc
) at that point ?
Thanks for your help.
Hi,
company-ghc-diagnose
shows no items when invoked first and suggests:
* company-ghc backend found: company-ghc
* automatic scan module is disabled.
You need to run either 'M-x company-ghc-turn-on-autoscan' once
or 'M-x company-ghc-scan-modules' when it is necessary.
* ghc-boot process has been done
However, :f1 v company-ghc-autoscan
gives:
company-ghc-autoscan is a variable defined in `company-ghc.el'.
Its value is t
After manually invoking company-ghc-scan-modules
, company-ghc-diagnose
shows found modules and candidates.
Emacs 24.5.1 on Arch, current company-ghc from gitHub
br,
vlatko
Is there any reason to not showing type info in completion annotation? Similar to company-ghc-show-module
but company-ghc-show-type-info
It could be very useful.
Hi there,
I'm not sure if this is exactly company-ghc's fault but I don't know where else to go, so feel free to point me somewhere else if needed :)
I'm working on the scheme48hours and interactive haskell hangs on me when I start a scheme repl from within the cabal repl. I have to kill ghc and then I either see this in Messages
Company: An error occurred in auto-begin
Wrong type argument: stringp, nil
or I get 1k lines of completions shown in the haskell process log. Either way I have to kill ghc and emacs starts responding only afterwards.
Steps to reproduce (on my machine at least):
C-c C-l
to load the file in the REPLrunRepl
to start the scheme replIn case you really go down testing this and want the code I have then here it is, the current master [0fc2d53] is the one you should clone.
To make the listing full, here are my versions:
Upon running company-ghc-diagnose
all modules get loaded, but no candidates appear, and ghc-mod
reports no errors either:
Further investigation shows that ghc-mod browse
can see the symbols exported without problems:
On a side-note, ghc-mod boot
shows all modules but very few names compared to what ghc-mod browse
does. However, none of those functions show up as candidates in the diagnose!
You can use the repository https://github.com/kerscher/preliminaries to try to reproduce.
The library is not on Hackage, yet.
A crosspost: company-mode/company-mode#226
Since ghc-modi browse
now supports -o
option to browse operators, it can be achieved.
I keep getting the "Visit tags table (default TAGS)" dialog whenever company-ghc tries to do code completion.
I had a search and found this for company mode https://github.com/company-mode/company-mode/issues/333
The followiing is the result of M-x describe-variable completion-at-point-function
completion-at-point-functions's value is (haskell-completions-completion-at-point t)
Local in buffer Main.hs; global value is
(tags-completion-at-point-function)
I have ghc-mod 5.5.0.0 installed with stack. What do I have to do to stop this behaviour ?
Hi!
I've been unable to successfully use company-ghci. Running
company-ghc-diagnose
shows nil and 0 completions:
company-ghc backend found: company-ghc
automatic scan module is enabled
Module Alias Candidates
-------------------------------------------------------------------------------
Seraph.Types - nil
Debug.Trace - nil
MVC - nil
Data.Set S nil
Data.Maybe - 0
Data.Map M nil
Control.Monad.Writer.Strict - nil
Control.Monad.State.Strict - nil
Control.Lens - nil
Prelude - 0
Before you invite me to RTFM, I have read the troubleshooting steps on
this: M-: (setq ghc-debug t)
and then M-x ghc-debug
. Nothing jumps
out me as erroneous:
% ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.3
% ghc-mod version
ghc-mod version 5.0.1 compiled by GHC 7.8.3
% ghc-modi version
ghc-modi version 5.0.1 compiled by GHC 7.8.3
I'm using flycheck-haskell and haskell-mode. I'm happy to provide any
additional details you find necessary and thankk you in advance for
any help you can provide with debugging.
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