Hi all
I want to import a function from a module and the compiler complains:
cannot import Pdf.Inspector.validate_file/1 because it doesn’t exist
And do not why.
The module implementation:
def validate_file(path) do
{_, code} = System.cmd("gs", ["-o /dev/null", "-sDEVICE=nullpage", path])
valid_file?(code)
end
And the import
defmodule Pdf.Server do
import Pdf.Inspector, only: [validate_file: 1]
use GenServer
def handle_call(path, _from, state) do
res = validate_file(path)
{:reply, res, state}
end
end
What am I doing wrong?
Thanks
Can you gist the full Pdf.Inspector module?
2 Likes
Sorry I’ve forgot to post:
defmodule Pdf.Inspector do
@spec validate_file(String.t) :: {:ok} | {:error}
def validate_file(path) do
{_, code} = System.cmd("gs", ["-o /dev/null", "-sDEVICE=nullpage", path])
valid_file?(code)
end
@spec count_pages(String.t) :: integer
def count_pages(path) do
{res, _} = System.cmd("gs", ["-q", "-dNODISPLAY", "-c", ~s/(#{path}) (r) file runpdfbegin pdfpagecount = quit/])
res
|> String.split("\n")
|> process
end
@spec process([String.t]) :: integer
defp process(list) do
search_page_number(list)
end
defp search_page_number([h|t]) do
try do
String.to_integer(h)
rescue
ArgumentError -> search_page_number(h)
end
end
defp search_page_number([]) do
0
end
defp valid_file?(0) do
{:ok}
end
defp valid_file?(1) do
{:error}
end
end
Based on the given code it does not look like anything is wrong. In that case we may need a SSCCE (a simple example that demonstrates the issue that we can git clone)?
1 Like
The file structure looks like this
When I try alias instead import and it compiles:
defmodule Pdf.Server do
#import Pdf.Inspector, only: [validate_file: 1]
alias Pdf.Inspector
use GenServer
def handle_call(path, _from, state) do
#res = validate_file(path)
#{:reply, res, state}
end
end
Very strength.
It works here is the thing:
iex5> import Pdf.Inspector, only: [validate_file: 1]
Pdf.Inspector
So an SSCCE that we can git clone would let us look at it for sure. 
Ok I will do it. Wait a second.
1 Like
You have a Elixir.Pdf.Inspector.beam sitting in your root directory that is overriding the module.
1 Like
Also as a side note you don’t want _build or deps checked into a git project.
1 Like
I know, I uploaded without thinking about it.
How can that happen of the Elixir.Pdf.Inspector.beam file, that sitting on the root.
Possibly you compiled a file manually or used the c helper inside iex? not sure.
3 Likes
Yeah maybe. Thanks so much.
