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🌲 Great Elixir Logging Made Easy. Official Timber.io Integration.
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lib/mix/tasks/timber/install/file_helper.ex
defmodule Mix.Tasks.Timber.Install.FileHelper do
@moduledoc false
alias __MODULE__.{FileReadingError, FileReplacePatternError, FileWritingError}
alias Mix.Tasks.Timber.Install.Config
def append_once!(path, contents, contains_pattern) do
case Config.file_client().read(path) do
{:ok, current_contents} ->
if String.contains?(current_contents, contains_pattern) do
:ok
else
case Config.file_client().open(path, [:append]) do
{:ok, file} ->
result = Config.io_client().binwrite(file, contents)
Config.file_client().close(file)
result
{:error, reason} -> raise(FileWritingError, path: path, reason: reason)
end
end
{:error, reason} -> raise(FileWritingError, path: path, reason: reason)
end
end
def read!(path) do
case Config.file_client().read(path) do
{:ok, contents} -> contents
{:error, reason} -> raise(FileReadingError, path: path, reason: reason)
end
end
def remove_once!(contents, pattern) do
String.replace(contents, pattern, "")
end
def replace_once!(contents, pattern, replacement, contains_pattern) do
if String.contains?(contents, contains_pattern) do
contents
else
new_contents = String.replace(contents, pattern, replacement)
if String.contains?(new_contents, contains_pattern) do
new_contents
else
raise(FileReplacePatternError, pattern: contains_pattern)
end
end
end
def write!(path, contents) do
case Config.file_client().open(path, [:write]) do
{:ok, file} ->
result = Config.io_client().binwrite(file, contents)
Config.file_client().close(file)
case result do
:ok -> :ok
{:error, reason} -> raise(FileWritingError, path: path, reason: reason)
end
{:error, reason} -> raise(FileWritingError, path: path, reason: reason)
end
end
#
# Errors
#
defmodule FileReplacePatternError do
defexception [:message]
def exception(opts) do
pattern = Keyword.fetch!(opts, :pattern)
message =
"""
Uh oh! We had a problem updating a file. The pattern
#{pattern} was not found after writing!
"""
%__MODULE__{message: message}
end
end
defmodule FileReadingError do
defexception [:message]
def exception(opts) do
path = Keyword.fetch!(opts, :path)
reason = Keyword.fetch!(opts, :reason)
message =
"""
Uh oh! We had a problem reading #{path}:
#{reason}
"""
%__MODULE__{message: message}
end
end
defmodule FileWritingError do
defexception [:message]
def exception(opts) do
path = Keyword.fetch!(opts, :path)
reason = Keyword.fetch!(opts, :reason)
message =
"""
Uh oh! We had a problem writing to #{path}:
#{reason}
"""
%__MODULE__{message: message}
end
end
end