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	diff --git a/README.md b/README.md
	index b7a3221..a4a8719 100644
	--- a/README.md
	+++ b/README.md
	@@ -1,133 +1,133 @@
	# Merge dictionaries

	## Root problem

	You uses everal IDEs and each maintain its own spelling dictionary.

	You want to merge them so words from PyCharm are available in PhpStorm too.

	## Usage

	### Merge all dictionaries

	To discover dictionaries in your computer, extract words and merge them:

	```shell
	$ merge-dictionaries --merge
	```

	This is a potentially destructive operation:
	your dictionary files will be overwritten.

	### Extract dictionaries words

	To print all the words:

	```shell
	$ merge-dictionaries --extract
	```

	This is a safe operation.

	### Build an Hunspell-compatible dictionary

	To create a personal dictionary file for your Hunspell dictionary:

	```shell
	$ merge-dictionaries --extract > $HOME/.hunspell_default
	```

	This is a safe read-only operation for your IDE files. This can
	overwrite your default Hunspell dictionary if it already exists.

	### Build a dictionary in a IDE specific format

	You can specify `--format=<format>` as argument to the extract task:

	```shell
	$ merge-dictionaries --extract --format=JetBrains
	```

	It will output a dictionary file you can use in any IDE compatible with that format.

	This is a safe read-only operation.

	### Sync with a Git repository

	Create a `$HOME/.config/merge-dictionaries.conf` with the following content:

	```yaml
	git:
	- git@github.com:luser/dictionary.git
	```

	See below if you wish to host the Git repository locally.

	+### Delete words from a dictionary
	+
	+Now your dictionaries are synced, it can be tricky to delete words from them,
	+as the next sync will overwrite them and restore words you removed if still in
	+the Git repository or one local fi
	+le.
	+
	+If you added a word in a dictionary, you can delete it:
	+
	+```shell
	+$ merge-dictionaries --delete-words <word> [word ...]
	+```
	+
	+This is a potentially destructive operation:
	+your dictionary files will be overwritten.
	+
	## IDE support

	Currently, the following IDEs are supported

	* All JetBrains IDEs: application-level dictionary
	* Hunspell: read personal dictionaries
	* Git repository

	## Extend the code
	### How to add an IDE?

	To add an IDE, you need to provide the following methods:

	* sources
	* a list of paths candidates for the IDE dictionary
	* a method extracting words from the dictionary
	* output
	* a method to dump the extracted words in the IDE format
	* write
	* a method to save the files, normally you can call the ones created
	+ * a method to rewrite a file with a list of words, so delete works too

	### How can I contribute?

	You can commit your changes to the upstream by following instructions at https://agora.nasqueron.org/How_to_contribute_code

	The canonical repository is https://devcentral.nasqueron.org/source/merge-dictionaries.git

	## FAQ

	-### Delete a word
	-
	-Not yet implemented. Here a proposal to implement this.
	-
	-Curently, the workflow is:
	-
	-[ extract ] -> { words } -> [ publish ]
	-
	-You want to add a new transformation step:
	-
	-[ extract ] -> { words } -> [ transform ] -> { words cleaned up } -> [ publish ]
	-
	-Add a transform step with an allowlist of the words to remove.
	-
	-It's not easy to detect if the user has removed a word explicitly
	-from a dictionary, as we don't cache extracted words.
	-
	### Host locally the Git repository

	If you want to host the repository on your local machine, use a bare repository:

	```shell
	$ git init --bare ~/.cache/dictionary
	Initialized empty Git repository in /usr/home/luser/.cache/dictionary/
	```

	You can push to a bare repository, but non-bare ones are protected against pushes,
	to avoid a desync between your index and the working files.

	Alternatively, you can prepare a script to do this sequence of operation:
	```shell
	$ merge-dictionaries --merge
	$ cd ~/.cache/dictionary
	$ git reset
	```

	## License

	BSD-2-Clause, see [LICENSE](LICENSE) file.
	diff --git a/setup.cfg b/setup.cfg
	index 76bac5e..04b207f 100644
	--- a/setup.cfg
	+++ b/setup.cfg
	@@ -1,33 +1,33 @@
	[metadata]
	name = merge-dictionaries
	-version = 0.3.0
	+version = 0.4.0
	author = Sébastien Santoro
	author_email = dereckson@espace-win.org
	description = Merge dictionaries
	long_description = file: README.md
	long_description_content_type = text/markdown
	license = BSD-2-Clause
	license_files = LICENSE
	url = https://devcentral.nasqueron.org/source/merge-dictionaries/
	project_urls =
	Bug Tracker = https://devcentral.nasqueron.org/tag/development_tools/
	classifiers =
	Programming Language :: Python :: 3
	License :: OSI Approved :: BSD License
	Operating System :: OS Independent
	Environment :: Console
	Intended Audience :: Developers
	Topic :: Software Development :: Build Tools

	[options]
	package_dir =
	= src
	packages = find:
	scripts =
	bin/merge-dictionaries
	python_requires = >=3.7
	install_requires =
	PyYAML>=6.0,<7.0

	[options.packages.find]
	where = src
	diff --git a/src/mergedictionaries/actions/__init__.py b/src/mergedictionaries/actions/__init__.py
	new file mode 100644
	index 0000000..49b79cd
	--- /dev/null
	+++ b/src/mergedictionaries/actions/__init__.py
	@@ -0,0 +1,9 @@
	+# -------------------------------------------------------------
	+# Merge dictionaries :: Actions
	+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	+# Project: Nasqueron
	+# License: BSD-2-Clause
	+# -------------------------------------------------------------
	+
	+
	+from .delete_words import DeleteAction
	diff --git a/src/mergedictionaries/actions/delete_words.py b/src/mergedictionaries/actions/delete_words.py
	new file mode 100644
	index 0000000..ace530c
	--- /dev/null
	+++ b/src/mergedictionaries/actions/delete_words.py
	@@ -0,0 +1,46 @@
	+#!/usr/bin/env python3
	+
	+# -------------------------------------------------------------
	+# Delete words from all dictionaries
	+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	+# Project: Nasqueron
	+# Description: Delete words from all dictionaries from
	+# all currently found sources.
	+# License: BSD-2-Clause
	+# -------------------------------------------------------------
	+
	+
	+from mergedictionaries import sources, write
	+from mergedictionaries.sources import GitRepository
	+
	+
	+class DeleteAction:
	+ def __init__(self, context):
	+ self.git_config = context["config"].get("git", [])
	+
	+ if "git" not in context:
	+ context["git"] = []
	+ self.git_cached_repos = context["git"]
	+
	+ def run(self, words):
	+ for source in self.get_sources():
	+ for arg in source["query"]():
	+ source["delete"](words, arg)
	+
	+ def get_sources(self):
	+ return [
	+ {
	+ "query": sources.jetbrains.find_application_level_dictionaries,
	+ "delete": lambda words, file: write.jetbrains.delete_words(file, words),
	+ },
	+ {
	+ "query": self.query_git_repositories,
	+ "delete": lambda words, repo: write.git.delete_words(repo, words),
	+ },
	+ ]
	+
	+ def query_git_repositories(self):
	+ return [
	+ GitRepository(git_repo_url, self.git_cached_repos)
	+ for git_repo_url in self.git_config
	+ ]
	diff --git a/src/mergedictionaries/app/app.py b/src/mergedictionaries/app/app.py
	index db8bbd5..fd4cd90 100644
	--- a/src/mergedictionaries/app/app.py
	+++ b/src/mergedictionaries/app/app.py
	@@ -1,161 +1,173 @@
	#!/usr/bin/env python3

	# -------------------------------------------------------------
	# Merge dictionaries
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Description: Merge dictionaries from various sources,
	# mainly IDEs, and allow to propagate them.
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	import argparse
	import os
	import sys

	import yaml

	from mergedictionaries import write, output, sources
	+from mergedictionaries.actions import DeleteAction


	# -------------------------------------------------------------
	# Extract words
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_dictionary_formatters():
	return {
	"JetBrains": output.jetbrains.dump,
	}


	# -------------------------------------------------------------
	# Configuration
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_configuration_path():
	return os.environ["HOME"] + "/.config/merge-dictionaries.conf"


	def parse_configuration():
	try:
	with open(get_configuration_path()) as fd:
	return yaml.safe_load(fd) or {}
	except OSError:
	return {}


	# -------------------------------------------------------------
	# Application entry point
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def parse_arguments():
	parser = argparse.ArgumentParser(description="Merge dictionaries.")

	parser.add_argument(
	"--extract",
	action="store_const",
	dest="task",
	const="extract",
	help="Extract all words from found dictionaries",
	)
	parser.add_argument(
	"--format", action="store", help="Specifies the output format", default="text"
	)

	parser.add_argument(
	"--merge",
	action="store_const",
	dest="task",
	const="merge",
	help="Merge all found dictionaries",
	)

	+ parser.add_argument(
	+ "-D",
	+ "--delete-words",
	+ metavar="word",
	+ dest="delete_words",
	+ nargs="+",
	+ help="Delete one or more words from the dictionaries",
	+ )
	+
	return parser.parse_args()


	class Application:
	def __init__(self):
	self.context = {"git": {}}

	def run(self):
	args = parse_arguments()

	- if args.task is None:
	+ task = "delete" if args.delete_words else args.task
	+ if task is None:
	print("No task has been specified.", file=sys.stderr)
	sys.exit(1)

	self.context["config"] = parse_configuration()
	self.context["args"] = args

	- if args.task == "extract":
	+ if task == "extract":
	self.run_extract_all_words(args.format)
	- elif args.task == "merge":
	+ elif task == "merge":
	self.run_merge()
	+ elif task == "delete":
	+ action = DeleteAction(self.context)
	+ action.run(args.delete_words)
	+
	+ self.on_exit()
	+ sys.exit(0)

	def get_dictionary_writers(self):
	return [
	lambda words: write.jetbrains.write(words),
	lambda words: write.git.write(
	words, self.context["config"].get("git", []), self.context["git"]
	),
	]

	def run_merge(self):
	words = self.extract_all_words()

	for method in self.get_dictionary_writers():
	method(words)

	- self.on_exit()
	-
	def get_words_sources(self):
	return [
	lambda: sources.git.extract_words_from_all_dictionaries(
	self.context["config"].get("git", []), self.context["git"]
	),
	lambda: sources.jetbrains.extract_words_from_all_dictionaries(),
	lambda: sources.hunspell.extract_words_from_all_dictionaries(),
	]

	def extract_all_words(self):
	return sorted(
	{word for method in self.get_words_sources() for word in method()}
	)

	def run_extract_all_words(self, words_format):
	words = self.extract_all_words()

	# Trivial case
	if words_format == "text" or words_format == "hunspell":
	if words_format == "hunspell":
	print(len(words))

	for word in words:
	print(word)

	- self.on_exit()
	- sys.exit(0)
	+ return

	# We need a specific formatter
	formatters = get_dictionary_formatters()
	if words_format not in formatters:
	print(f"Unknown format: {words_format}", file=sys.stderr)
	self.on_exit()
	sys.exit(2)

	print(formatters[words_format](words))
	- self.on_exit()
	- sys.exit(0)

	def on_exit(self):
	"""Events to run before exiting to cleanup resources."""
	- sources.git.on_exit(self.context["git"])
	+ sources.git.on_exit(self.context.get("git", {}))


	def run():
	app = Application()
	app.run()
	diff --git a/src/mergedictionaries/utils/collections.py b/src/mergedictionaries/utils/collections.py
	new file mode 100644
	index 0000000..4e59383
	--- /dev/null
	+++ b/src/mergedictionaries/utils/collections.py
	@@ -0,0 +1,31 @@
	+# -------------------------------------------------------------
	+# Merge dictionaries :: Utilities :: Collections
	+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	+# Project: Nasqueron
	+# Description: Helper functions for lists
	+# License: BSD-2-Clause
	+# -------------------------------------------------------------
	+
	+
	+from typing import List
	+
	+
	+def remove_words(current_words: List, words_to_delete: List) -> List:
	+ """
	+ Removes specified words from a list of words.
	+
	+ Parameters:
	+ current_words: list
	+ The list of words from which specified words are to be removed.
	+ words_to_delete: list
	+ The list containing words that need to be removed.
	+
	+ Returns:
	+ list
	+ A new list containing words from the current_words list that are not
	+ present in the words_to_delete list.
	+ """
	+ words = list(set(current_words) - set(words_to_delete))
	+ words.sort()
	+
	+ return words
	diff --git a/src/mergedictionaries/write/git.py b/src/mergedictionaries/write/git.py
	index ff9873e..ec7ba7d 100644
	--- a/src/mergedictionaries/write/git.py
	+++ b/src/mergedictionaries/write/git.py
	@@ -1,33 +1,52 @@
	# -------------------------------------------------------------
	# Merge dictionaries :: Publishers :: Git repository
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Description: Find application-level dictionaries
	# from Git repository
	# License: BSD-2-Clause
	# -------------------------------------------------------------
	+
	+
	import os
	from tempfile import NamedTemporaryFile
	+from typing import List

	from mergedictionaries.sources import GitRepository
	+from mergedictionaries.utils.collections import remove_words


	def build_temporary_dictionary(words):
	fd = NamedTemporaryFile(delete=False)
	for word in words:
	fd.write(f"{word}\n".encode("utf-8"))
	fd.close()

	return fd.name


	def write(words, target_repos, cached_repos):
	if not target_repos:
	return

	tmp_dictionary_path = build_temporary_dictionary(words)

	for repo in target_repos:
	GitRepository(repo, cached_repos).publish(tmp_dictionary_path)

	os.unlink(tmp_dictionary_path)
	+
	+
	+def delete_words(repo: GitRepository, words_to_delete: List):
	+ current_words = repo.extract_words()
	+
	+ if not any(word in current_words for word in words_to_delete):
	+ # Nothing to do, the dictionary is already up to date.
	+ return
	+
	+ words = remove_words(current_words, words_to_delete)
	+
	+ tmp_dictionary_path = build_temporary_dictionary(words)
	+ repo.publish(tmp_dictionary_path)
	+
	+ os.unlink(tmp_dictionary_path)
	diff --git a/src/mergedictionaries/write/jetbrains.py b/src/mergedictionaries/write/jetbrains.py
	index 5bcdb93..64f5e2e 100644
	--- a/src/mergedictionaries/write/jetbrains.py
	+++ b/src/mergedictionaries/write/jetbrains.py
	@@ -1,21 +1,37 @@
	# -------------------------------------------------------------
	# Merge dictionaries :: Publishers :: JetBrains IDEs
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Description: Find application-level dictionaries
	# from JetBrains IDEs
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	from mergedictionaries.sources import jetbrains as jetbrains_source
	from mergedictionaries.output import jetbrains as jetbrains_output
	+from mergedictionaries.utils.collections import remove_words


	def write(words):
	contents = jetbrains_output.dump(words)

	for file_path in jetbrains_source.find_application_level_dictionaries():
	with open(file_path, "w") as fd:
	fd.write(contents)
	fd.write("\n")
	+
	+
	+def delete_words(file_path, words_to_delete):
	+ current_words = jetbrains_source.extract_words(file_path)
	+
	+ if not any(word in current_words for word in words_to_delete):
	+ # Nothing to do, the dictionary is already up to date.
	+ return
	+
	+ words = remove_words(current_words, words_to_delete)
	+
	+ contents = jetbrains_output.dump(words)
	+ with open(file_path, "w") as fd:
	+ fd.write(contents)
	+ fd.write("\n")

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