Merged default

17 files changed, 820 insertions, 198 deletions

diff --git a/.hgignore b/.hgignore
index fc3ed61..b22e97c 100644
--- a/.hgignore
+++ b/.hgignore
@@ -5,6 +5,7 @@ syntax: glob
 *.egg-info
 *.tar.xz
 *.tar.xz.sig
+*.tar.zst
 
 build/*
 dist/*
@@ -13,3 +14,5 @@ PKGBUILD/src/*
 PKGBUILD/*.zip
 PKGBUILD/.git/*
 PKGBUILD/.SRCINFO
+venv/*
+.mypy_cache/*
diff --git a/PKGBUILD/PKGBUILD b/PKGBUILD/PKGBUILD
index ca4fba9..42ca51b 100644
--- a/PKGBUILD/PKGBUILD
+++ b/PKGBUILD/PKGBUILD
@@ -1,27 +1,26 @@
 # Maintainer: Dennis Fink <dennis.fink@c3l.lu>
 
 pkgname=patternutils
-pkgver=0.0.8
-_pkghash=853b2c08d397
+pkgver=0.0.12
 pkgrel=1
 pkgdesc="Combine regular expressions with template engines in a powerful matter."
 arch=('any')
 url="https://projects.metalgamer.eu/patternutils"
 license=('GPL3')
-depends=('python' 'python-click' 'python-jinja' 'python-pygments')
-source=('patternutils-0.0.8.zip::https://projects.metalgamer.eu/patternutils/archive/853b2c08d397ad61442b8caf7d8cd4723a1dd04e.zip?subrepos=false')
-sha512sums=('dc29e9403e260a04cbe986567a37ecd17bf2b335dbe99c3b274d5568252e22464b7bb52fd2e9dba459ac83d8f79eb39a832641f224fe0911522d60f6c0069a44')
+depends=('python' 'python-click' 'python-jinja' 'python-pygments' 'python-feedparser')
+source=('https://download.metalgamer.eu/patternutils/patternutils-0.0.12.tar.gz')
+sha512sums=('2d39fce29eda388436f2c11da1df8016436f0441e1c77c53aa1b7fa863e7862073629ee4dfb7d082abea0b70760c2535554fec0a0bfc6cd8674f688c6f37c771')
 
 prepare() {
-    sed -i 's/==/>=/g' "$srcdir/$pkgname-$_pkghash/setup.py"
+    sed -i 's/==/>=/g' "$srcdir/$pkgname-$pkgver/setup.py"
 }
 
 build() {
-    cd "$srcdir/$pkgname-$_pkghash"
+    cd "$srcdir/$pkgname-$pkgver"
     python setup.py build
 }
 
 package() {
-    cd "$srcdir/$pkgname-$_pkghash"
+    cd "$srcdir/$pkgname-$pkgver"
     python setup.py install --root="$pkgdir" --optimize=1
 }
diff --git a/patternutils/commands/patterncfg.py b/patternutils/commands/patterncfg.py
index f619196..6b2f6ec 100644
--- a/patternutils/commands/patterncfg.py
+++ b/patternutils/commands/patterncfg.py
@@ -6,9 +6,9 @@ from typing import Optional
 import click
 
 try:
-    from pygments import highlight
-    from pygments.formatters import TerminalFormatter
-    from pygments.lexers import DjangoLexer, Python3Lexer
+    from pygments import highlight  # type: ignore
+    from pygments.formatters import TerminalFormatter  # type: ignore
+    from pygments.lexers import DjangoLexer, Python3Lexer  # type: ignore
 except ImportError:
     has_pygments = False
 else:
@@ -137,12 +137,19 @@ def view(name: str, command: str, color: bool) -> None:
         click.secho("File not found!", fg="red", err=True)
         raise SystemExit
     else:
-        if color:
+        if color and has_pygments:
             if filename.endswith("jinja2"):
                 lexer = DjangoLexer
             else:
                 lexer = Python3Lexer
             text = highlight(text, lexer(), TerminalFormatter())
+        elif color and not has_pygments:
+            click.secho(
+                "Pygments is not installed!. Cannot colorize output.",
+                fg="red",
+                err=True,
+            )
+            raise SystemExit
         click.echo(text[:-1])
 
 
diff --git a/patternutils/commands/pjson.py b/patternutils/commands/pjson.py
new file mode 100644
index 0000000..8604971
--- /dev/null
+++ b/patternutils/commands/pjson.py
@@ -0,0 +1,131 @@
+import json
+import re
+from typing import Any, Pattern
+
+import click
+
+from .. import match as mat
+from .. import utils
+
+
+def apply_regex(
+    data: dict[str, str], key: str, regex_pattern: Pattern[str]
+) -> dict[str, str]:
+    try:
+        subject = data[key]
+    except KeyError:
+        click.secho(f"{key} can not be found in data!", fg="red", err=True)
+        raise
+
+    try:
+        match = mat.apply(subject, regex_pattern)
+    except ValueError:
+        click.secho(f"{subject} did not match", fg="red", err=True)
+        raise
+    else:
+        return match
+
+
+@click.command(context_settings={"help_option_names": ("-h", "--help", "-?")})
+@click.option("--read-from", default="-", type=click.File("r"))
+@click.option(
+    "--stream",
+    is_flag=True,
+    default=False,
+    help="Input is a stream of JSON objects and output will also be a stream of JSON objects",
+)
+@click.option(
+    "--abort-on-no-key",
+    is_flag=True,
+    default=False,
+    help="exit if a key does not exist",
+)
+@click.option(
+    "--abort-on-no-match",
+    is_flag=True,
+    default=False,
+    help="exit if a value does not match the REGEX_PATTERN",
+)
+@click.option(
+    "--abort-on-empty-data",
+    is_flag=True,
+    default=False,
+    help="exit if the data is empty",
+)
+@click.option(
+    "--human-readable",
+    is_flag=True,
+    default=False,
+    help="output the JSON in a human readable format",
+)
+@click.option(
+    "-v", "--verbose", is_flag=True, default=False, help="explain what is being done"
+)
+@click.version_option()
+@click.argument("key")
+@click.argument("regex-pattern")
+def pjson(
+    key: str,
+    regex_pattern: str,
+    read_from: click.File,
+    stream: bool,
+    abort_on_no_key: bool,
+    abort_on_no_match: bool,
+    abort_on_empty_data: bool,
+    human_readable: bool,
+    verbose: bool,
+) -> None:
+
+    try:
+        regex_pattern_c = re.compile(regex_pattern)
+    except re.error as e:
+        if verbose:
+            click.secho("Regular expression could not be compiled!", fg="red", err=True)
+        click.secho(e.msg, fg="red", err=True)
+        raise SystemExit
+
+    if stream:
+        data = map(utils.json_loads, read_from)  # type: ignore
+    else:
+        data = utils.json_loads(read_from.read())  # type: ignore
+
+    matches = []
+
+    has_no_key = False
+    has_no_match = False
+    has_empty_data = False
+    for line in data:
+
+        if not line:
+            has_empty_data = True
+            click.secho(f"{line} has no input.", fg="red", err=True)
+            if stream and abort_on_empty_data:
+                raise SystemExit
+            continue
+
+        try:
+            match = apply_regex(line, key, regex_pattern_c)
+        except KeyError:
+            has_no_key = True
+            if stream and abort_on_no_key:
+                raise SystemExit
+        except ValueError:
+            has_no_match = True
+            if stream and abort_on_no_match:
+                raise SystemExit
+        else:
+            line.update(match)
+            if stream:
+                click.echo(utils.json_dumps(line, human_readable))
+            else:
+                matches.append(line)
+
+    if not stream:
+        if (
+            (abort_on_no_key and has_no_key)
+            or (abort_on_no_match and has_no_match)
+            or (abort_on_empty_data and has_empty_data)
+        ):
+            raise SystemExit
+
+        click.echo(utils.json_dumps(matches, human_readable))
diff --git a/patternutils/commands/pmatch.py b/patternutils/commands/pmatch.py
index 6bbd349..3884a9d 100644
--- a/patternutils/commands/pmatch.py
+++ b/patternutils/commands/pmatch.py
@@ -1,10 +1,8 @@
 import functools
 import itertools
-import json
-import os
 import os.path
 import re
-from typing import Any, Dict, Generator, Iterator, List, Pattern, Tuple
+from typing import Any, Generator, Iterator, Optional, Pattern
 
 import click
 
@@ -13,43 +11,26 @@ from .. import match as mat
 from .. import utils
 
 
-def walk(
-    dir: str, recursive: bool = False, match_directories: bool = False
-) -> Generator[os.DirEntry, None, None]:
-    for entry in os.scandir(dir):
-        is_dir = entry.is_dir()
-        if recursive and is_dir:
-            yield from walk(entry.path, recursive, match_directories)
-        elif entry.is_file() or (match_directories and is_dir):
-            yield entry
-        else:
-            continue
-
-
 def apply_regex(
     walk_function: Iterator[Any],
     regex_pattern: Pattern[str],
     match_full_path: bool,
-) -> Tuple[List[Dict[str, str]], bool]:
+) -> Generator[Optional[dict[str, str]], None, None]:
 
-    matches = []
-    has_invalid_matches = False
     for f in walk_function:
-        subject = f.path if match_full_path else f.name
+        subject = os.path.abspath(f.path) if match_full_path else f.name
         try:
             match = mat.apply(subject, regex_pattern)
         except ValueError:
             click.secho(f"{subject} did not match", fg="red", err=True)
-            has_invalid_matches = True
+            yield None
         else:
             match["_path"] = f.path
             match["_name"] = f.name
             match["_abspath"] = os.path.abspath(f.path)
             match["_realpath"] = os.path.realpath(f.path)
             match["_relpath"] = os.path.relpath(f.path)
-            matches.append(match)
-
-    return matches, has_invalid_matches
+            yield match
 
 
 @click.command(context_settings={"help_option_names": ("-h", "--help", "-?")})
@@ -78,7 +59,7 @@ def apply_regex(
     "--match-full-path",
     is_flag=True,
     default=False,
-    help="match on full path instead of only filename",
+    help="match on full absolute path instead of only the filename",
 )
 @click.option(
     "-p",
@@ -106,7 +87,7 @@ def apply_regex(
 @click.argument("regex-pattern")
 def pmatch(
     regex_pattern: str,
-    directory: List[str],
+    directory: list[str],
     match_directories: bool,
     recursive: bool,
     abort_on_no_match: bool,
@@ -132,26 +113,31 @@ def pmatch(
     except re.error as e:
         if verbose:
             click.secho("Regular expression could not be compiled!", fg="red", err=True)
-        click.secho(e.msg, fg="red", err=True)  # type: ignore
+        click.secho(e.msg, fg="red", err=True)
         raise SystemExit
 
     # Monkey patch walk function to include commandline options
     walk_function = functools.partial(
-        walk, recursive=recursive, match_directories=match_directories
+        utils.walk, recursive=recursive, match_directories=match_directories
     )
     new_walk = itertools.chain.from_iterable(map(walk_function, directory))
 
-    matches, has_invalid_matches = apply_regex(
-        new_walk, regex_pattern_c, match_full_path
-    )
-
-    if has_invalid_matches and abort_on_no_match:
-        raise SystemExit
+    has_invalid_matches = False
+    matches = []
+    for match in apply_regex(new_walk, regex_pattern_c, match_full_path):
+        if match is None:
+            has_invalid_matches = True
+            if stream and abort_on_no_match:
+                raise SystemExit
+        else:
+            if stream:
+                click.echo(utils.json_dumps(match, human_readable))
+            else:
+                matches.append(match)
 
-    if stream:
-        for m in matches:
-            click.echo(utils.json_dumps(m, human_readable))
-    else:
+    if not stream:
+        if has_invalid_matches and abort_on_no_match:
+            raise SystemExit
         click.echo(utils.json_dumps(matches, human_readable))
 
 
diff --git a/patternutils/commands/prss.py b/patternutils/commands/prss.py
new file mode 100644
index 0000000..1ec4675
--- /dev/null
+++ b/patternutils/commands/prss.py
@@ -0,0 +1,143 @@
+import functools
+import itertools
+import os
+import os.path
+from typing import Any, Generator, Iterator, Optional
+
+import click
+
+try:
+    import feedparser  # type: ignore
+except ImportError:
+    click.secho("feedparser not installed!", fg="red", err=True)
+    raise SystemExit
+
+from .. import utils
+
+
+def match(
+    parsed_feed: feedparser.util.FeedParserDict,
+    walk_function: functools.partial[Generator[os.DirEntry[Any], None, None]],
+    directory: list[str],
+) -> Generator[Optional[dict[str, str]], None, None]:
+
+    direntries = []
+    filenames = []
+
+    for f in itertools.chain.from_iterable(map(walk_function, directory)):
+        direntries.append(f)
+        filenames.append(f.name)
+
+    for entry in parsed_feed.entries:
+        href = entry.enclosures[0]["href"]
+        splitted_href = href.split("/")
+        file_to_search = splitted_href[-1]
+        try:
+            file_index = filenames.index(file_to_search)
+        except ValueError:
+            click.secho(f"{file_to_search} not found!", fg="red", err=True)
+            yield None
+        else:
+            filename = filenames[file_index]
+            direntry = direntries[file_index]
+            entry_values = {
+                "title": entry.get("title", None),
+                "link": entry.get("link", None),
+                "description": entry.get("description", None),
+                "id": entry.get("id", None),
+                "enclosure_href": href,
+                "published": entry.get("published", None),
+                "subtitle": entry.get("subtitle", None),
+                "summary": entry.get("summary", None),
+                "author": entry.get("author", None),
+                "_name": filename,
+                "_path": direntry.path,
+                "_abspath": os.path.abspath(direntry.path),
+                "_realpath": os.path.realpath(direntry.path),
+                "_relpath": os.path.relpath(direntry.path),
+                "feed_title": parsed_feed.feed.get("title", None),
+                "feed_link": parsed_feed.feed.get("link", None),
+                "feed_description": parsed_feed.feed.get("description", None),
+            }
+            yield entry_values
+
+
+@click.command(context_settings={"help_option_names": ("-h", "--help", "-?")})
+@click.option("-d", "--directory", multiple=True, default=["./"])
+@click.option(
+    "-r",
+    "--recursive",
+    is_flag=True,
+    default=False,
+    help="search directories recursively",
+)
+@click.option(
+    "--abort-on-no-file",
+    is_flag=True,
+    default=False,
+    help="exit if a file can not be found",
+)
+@click.option(
+    "--stream",
+    is_flag=True,
+    default=False,
+    help="Output a stream of objects instead a list of objects",
+)
+@click.option(
+    "--human-readable",
+    is_flag=True,
+    default=False,
+    help="output the JSON in a human readable format",
+)
+@click.option(
+    "-v", "--verbose", is_flag=True, default=False, help="explain what is being done"
+)
+@click.version_option()
+@click.argument("url")
+def prss(
+    url: str,
+    directory: list[str],
+    recursive: bool,
+    abort_on_no_file: bool,
+    stream: bool,
+    human_readable: bool,
+    verbose: bool,
+) -> None:
+
+    try:
+        parsed_feed = feedparser.parse(url)
+    except Exception:
+        click.secho("Reading feed failed!", fg="red", err=True)
+        raise SystemExit
+    else:
+        if not parsed_feed.version:
+            click.secho("Unsupported feed!", fg="red", err=True)
+            raise SystemExit
+
+    # Mokey patch walk function to include commandline options
+    walk_function = functools.partial(
+        utils.walk, recursive=recursive, match_directories=False
+    )
+
+    matches = []
+    has_no_file = False
+    for m in match(parsed_feed, walk_function, directory):
+        if m is None:
+            has_no_file = True
+            if abort_on_no_file and stream:
+                raise SystemExit
+        else:
+            if stream:
+                click.echo(utils.json_dumps(m, human_readable))
+            else:
+                matches.append(m)
+
+    if not stream:
+        if abort_on_no_file and has_no_file:
+            raise SystemExit
+
+        click.echo(utils.json_dumps(matches, human_readable))
+
+
+if __name__ == "__main__":
+    prss()
diff --git a/patternutils/commands/targs.py b/patternutils/commands/targs.py
index 04c286d..34cf018 100644
--- a/patternutils/commands/targs.py
+++ b/patternutils/commands/targs.py
@@ -4,7 +4,7 @@ import multiprocessing
 import os
 import shlex
 import subprocess
-from typing import Callable, Dict, List, Union
+from typing import Callable
 
 import click
 
@@ -12,16 +12,11 @@ from .. import config, template, utils
 
 
 def run_command(
-    data: Dict[str, str],
+    command: str,
     run: Callable[..., None],
     shell: bool,
 ) -> None:
-    if not shell:
-        prepared_command = shlex.split(c)  # type: Union[str, List[str]]
-    else:
-        prepared_command = c
-
-    run(prepared_command)
+    run(shlex.split(command) if not shell else command)
 
 
 @click.command(context_settings={"help_option_names": ("-h", "--help", "-?")})
@@ -69,6 +64,13 @@ def run_command(
     default=False,
     help="Open an editor before running commands to allow manual changes",
 )
+@click.option(
+    "-n",
+    "--dry-run",
+    is_flag=True,
+    default=False,
+    help="perform a trial run without actually executing the command",
+)
 @click.version_option()
 @click.argument("command")
 def targs(
@@ -83,16 +85,19 @@ def targs(
     stream: bool,
     editor: bool,
     verbose: bool,
+    dry_run: bool,
 ) -> None:
+    """Execute commands based on a template string.
 
-    try:
-        if not stream:
-            data = json.load(read_from)  # type: ignore
-        else:
-            data = [json.loads(line) for line in read_from]
-    except json.JSONDecodeError:
-        click.secho("JSON not valid!", fg="red", err=True)
-        raise SystemExit
+    It reads in a JSON list containing objects, or a stream of objects (if the
+    --stream option is used), which are then supplied to the templating engine,
+    to generate the command to run.
+    """
+
+    if stream:
+        data = map(utils.json_loads, read_from)  # type: ignore
+    else:
+        data = utils.json_loads(read_from.read())  # type: ignore
 
     if use_predefined_template:
         try:
@@ -114,13 +119,13 @@ def targs(
 
     if editor:
         try:
-            commands = utils.edit(commands)
-        except RuntimeErro:
+            if (new_commands := utils.edit(commands)) is not None:
+                commands = list(new_commands.values())
+
+        except RuntimeError:
             click.secho("Your edit is not parseable!", fg="red", err=True)
             raise SystemExit
 
-    max_procs = utils.max_procs() if max_procs == 0 else max_procs
-
     stdout = subprocess.DEVNULL if redirect_stdout else None
     stderr = subprocess.DEVNULL if redirect_stderr else None
     patched_subprocess = functools.partial(
@@ -129,11 +134,22 @@ def targs(
         stdout=stdout,
         stderr=stderr,
     )
-    patched_run_command = functools.partial(
-        run_command,
-        run=patched_subprocess,
-        shell=shell,
-    )
+
+    if not dry_run:
+        patched_run_command = functools.partial(
+            run_command,
+            run=patched_subprocess,
+            shell=shell,
+        )
+    else:
+        patched_run_command = functools.partial(
+            run_command,
+            run=print,
+            shell=True,
+        )
+
+    max_procs = utils.max_procs() if max_procs == 0 else max_procs
+
     if max_procs == 1:
         for r in commands:
             patched_run_command(r)
diff --git a/patternutils/commands/tln.py b/patternutils/commands/tln.py
index 295cda9..878f556 100644
--- a/patternutils/commands/tln.py
+++ b/patternutils/commands/tln.py
@@ -8,8 +8,7 @@ from .. import config, template, utils
 
 
 def link_file(old_filename: str, new_filename: str, symbolic: bool) -> None:
-    dirs = os.path.dirname(new_filename)
-    if dirs:
+    if dirs := os.path.dirname(new_filename):
         os.makedirs(dirs, exist_ok=True)
 
     if symbolic:
@@ -98,19 +97,14 @@ def tln(
     key: str,
     stream: bool,
     abort_on_path_exist: bool,
-    dry_run,
-    bool,
+    dry_run: bool,
     verbose: bool,
 ) -> None:
 
-    try:
-        if not stream:
-            data = json.load(read_from)  # type: ignore
-        else:
-            data = [json.loads(line) for line in read_from]
-    except json.JSONDecodeError:
-        click.secho("JSON not valid!", fg="red", err=True)
-        raise SystemExit
+    if stream:
+        data = map(utils.json_loads, read_from)  # type: ignore
+    else:
+        data = utils.json_loads(read_from.read())  # type: ignore
 
     if use_predefined_template:
         try:
@@ -134,9 +128,10 @@ def tln(
 
     if editor:
         try:
-            new_filenames = utils.edit(new_filenames)
+            if (temporary_filenames := utils.edit(new_filenames)) is not None:
+                new_filenames = temporary_filenames
         except RuntimeError:
-            click.secho("You edit is not parseable!", fg="red", err=True)
+            click.secho("Your edit is not parseable!", fg="red", err=True)
             raise SystemExit
 
     has_existing = False
@@ -151,10 +146,7 @@ def tln(
     if has_existing and abort_on_path_exist:
         raise SystemExit
 
-    if force:
-        files_to_move = new_filenames.items()
-    else:
-        files_to_move = non_existing.items()
+    files_to_move = new_filenames.items() if force else non_existing.items()
 
     for old, new in files_to_move:
         if verbose or interactive:
diff --git a/patternutils/commands/tmv.py b/patternutils/commands/tmv.py
index 3e92342..fa7105e 100644
--- a/patternutils/commands/tmv.py
+++ b/patternutils/commands/tmv.py
@@ -92,21 +92,17 @@ def tmv(
 
     """Rename files based on the OUTPUT_PATTERN.
 
-    It reads a JSON list containing objects or a stream of objects
-    (if --stream option is defined). The object needs to have a
-    key named as the option KEY (default: _abspath), which points
-    to the file to move. The rest of the keys will be supplied to
-    the templating engine to generate the new filename.
+    It reads in a JSON list containing objects or a stream of objects (if the
+    --stream option is used). The object needs to contain a key, named as
+    the specified option KEY (default: _abspath), which points to the file to
+    be moved. The rest of the keys will be supplied to the templating engine to
+    generate the new filename.
     """
 
-    try:
-        if not stream:
-            data = json.load(read_from)  # type: ignore
-        else:
-            data = [json.loads(line) for line in read_from]
-    except json.JSONDecodeError:
-        click.secho("JSON not valid!", fg="red", err=True)
-        raise SystemExit
+    if stream:
+        data = map(utils.json_loads, read_from)  # type: ignore
+    else:
+        data = utils.json_loads(read_from.read())  # type: ignore
 
     if use_predefined_template:
         try:
@@ -130,7 +126,8 @@ def tmv(
 
     if editor:
         try:
-            new_filenames = utils.edit(new_filenames)
+            if (temporary_filenames := utils.edit(new_filenames)) is not None:
+                new_filenames = temporary_filenames
         except RuntimeError:
             click.secho("Your edit is not parseable!", fg="red", err=True)
             raise SystemExit
@@ -147,10 +144,7 @@ def tmv(
     if has_existing and abort_on_path_exist:
         raise SystemExit
 
-    if force:
-        files_to_move = new_filenames.items()
-    else:
-        files_to_move = non_existing.items()
+    files_to_move = new_filenames.items() if force else non_existing.items()
 
     for old, new in files_to_move:
         if verbose or interactive:
diff --git a/patternutils/config.py b/patternutils/config.py
index 319f035..f999b2e 100644
--- a/patternutils/config.py
+++ b/patternutils/config.py
@@ -1,7 +1,7 @@
 import glob
 import os.path
 import re
-from typing import List, Optional, Tuple
+from typing import Optional
 
 import click
 
@@ -11,7 +11,7 @@ REGEX_PROGRAMS = ("pmatch",)
 TEMPLATE_PROGRAMS = ("tmv", "targs", "tln")
 
 
-def load_template(template_name: str, command_name: Optional[str]) -> Tuple[str, str]:
+def load_template(template_name: str, command_name: Optional[str]) -> tuple[str, str]:
     """Load a template from the config directory."""
 
     files = find_templates(template_name, command_name)
diff --git a/patternutils/match.py b/patternutils/match.py
index 80f9553..fc6a805 100644
--- a/patternutils/match.py
+++ b/patternutils/match.py
@@ -1,9 +1,8 @@
-from typing import Dict, Pattern
+from typing import Pattern
 
 
-def apply(subject: str, regex_pattern: Pattern[str]) -> Dict[str, str]:
-    match = regex_pattern.search(subject)
-    if match is not None:
+def apply(subject: str, regex_pattern: Pattern[str]) -> dict[str, str]:
+    if (match := regex_pattern.search(subject)) is not None:
         groupdict = match.groupdict()
         groupdict["_subject"] = subject
         return groupdict
diff --git a/patternutils/template.py b/patternutils/template.py
index 53746a2..f0b3c43 100644
--- a/patternutils/template.py
+++ b/patternutils/template.py
@@ -5,8 +5,8 @@ try:
 except ImportError:
     jinja_feature = False
 else:
+    import os.path
     import shlex
-
     from datetime import datetime
 
     jinja_feature = True
@@ -27,11 +27,19 @@ else:
     def quote(value: str) -> str:
         return shlex.quote(value)
 
+    def splitpath(value: str) -> tuple[str, str]:
+        return os.path.split(value)
+
+    def splitext(value: str) -> tuple[str, str]:
+        return os.path.splitext(value)
+
     jinja_env.filters["datetime"] = to_datetime
     jinja_env.filters["datetimeformat"] = format_datetime
     jinja_env.filters["int"] = to_int
     jinja_env.filters["float"] = to_float
     jinja_env.filters["quote"] = quote
+    jinja_env.filters["splitpath"] = splitpath
+    jinja_env.filters["splitext"] = splitext
 
 
 def get_render_function(template: str, *, engine: str = "python") -> Callable[..., str]:
diff --git a/patternutils/utils.py b/patternutils/utils.py
index 266f3b9..0395110 100644
--- a/patternutils/utils.py
+++ b/patternutils/utils.py
@@ -1,6 +1,6 @@
-import os
 import json
-from typing import Dict, Any
+import os
+from typing import Any, Generator, Optional, Union
 
 import click
 
@@ -10,30 +10,58 @@ def max_procs() -> int:
     return 1 if cpu_count is None else cpu_count * 2
 
 
-def edit(data: Dict[str, str]) -> Dict[str, str]:
+def edit(data: Union[dict[str, str], list[str]]) -> Optional[dict[str, str]]:
 
     longest = len(max(data, key=len))
-    temporary = [
-        "{}\t{}\n".format(key.ljust(longest), value) for key, value in data.items()
-    ]
-    edited = click.edit("".join(temporary))
 
-    if edited is not None:
-        new_data = dict()
-        for line in edited.split("\n"):
-            if line and "\t" in line:
-                old, new = line.split("\t")
-                new_data[old.strip()] = new
-        if new_data:
-            return new_data
-        else:
-            raise RuntimeError
+    if isinstance(data, dict):
+        temporary = [f"{key.ljust(longest)}\t{value}\n" for key, value in data.items()]
     else:
-        return data
+        temporary = [f"{value.ljust(longest)}\t{value}\n" for value in data]
 
+    try:
+        if (edited := click.edit("".join(temporary))) is not None:
+            new_data = dict()
+            for line in edited.split("\n"):
+                if line and "\t" in line:
+                    old, new = line.split("\t")
+                    new_data[old.strip()] = new
+            if new_data:
+                return new_data
+            else:
+                raise RuntimeError
+        else:
+            return None
+    except click.UsageError:
+        click.secho("The editor could not be launced!", fg="red", err=True)
+        raise SystemExit
 
-def json_dumps(data: Any, humand_readable: bool = False) -> str:
-    if humand_readable:
-        return json.dumps(data, indent=4, sort_keys=True)
-    else:
-        return json.dumps(data, separators=(",", ":"))
+
+def json_dumps(data: Any, human_readable: bool = False) -> str:
+    config = (
+        {"indent": 4, "sort_keys": True}
+        if human_readable
+        else {"separators": (",", ":")}
+    )  # type: dict[str, Any]
+    return json.dumps(data, **config)
+
+
+def json_loads(data: Any) -> Any:
+    try:
+        return json.loads(data)
+    except json.JSONDecodeError:
+        click.secho("JSON not valid!", fg="red", err=True)
+        raise SystemExit
+
+
+def walk(
+    directory: str, recursive: bool = False, match_directories: bool = False
+) -> Generator[os.DirEntry[Any], None, None]:
+    for entry in os.scandir(directory):
+        is_dir = entry.is_dir()
+        if recursive and is_dir:
+            yield from walk(entry.path, recursive, match_directories)
+        elif entry.is_file() or (match_directories and is_dir):
+            yield entry
+        else:
+            continue
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..486a87d
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,335 @@
+[[package]]
+name = "black"
+version = "21.12b0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+click = ">=7.1.2"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0,<1"
+platformdirs = ">=2"
+tomli = ">=0.2.6,<2.0.0"
+typing-extensions = [
+    {version = ">=3.10.0.0", markers = "python_version < \"3.10\""},
+    {version = "!=3.10.0.1", markers = "python_version >= \"3.10\""},
+]
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+python2 = ["typed-ast (>=1.4.3)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
+name = "click"
+version = "8.0.3"
+description = "Composable command line interface toolkit"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "feedparser"
+version = "6.0.8"
+description = "Universal feed parser, handles RSS 0.9x, RSS 1.0, RSS 2.0, CDF, Atom 0.3, and Atom 1.0 feeds"
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[package.dependencies]
+sgmllib3k = "*"
+
+[[package]]
+name = "isort"
+version = "5.10.1"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
+optional = false
+python-versions = ">=3.6.1,<4.0"
+
+[package.extras]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
+requirements_deprecated_finder = ["pipreqs", "pip-api"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
+plugins = ["setuptools"]
+
+[[package]]
+name = "jinja2"
+version = "3.0.3"
+description = "A very fast and expressive template engine."
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[package.dependencies]
+MarkupSafe = ">=2.0"
+
+[package.extras]
+i18n = ["Babel (>=2.7)"]
+
+[[package]]
+name = "markupsafe"
+version = "2.0.1"
+description = "Safely add untrusted strings to HTML/XML markup."
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[[package]]
+name = "mypy"
+version = "0.930"
+description = "Optional static typing for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+mypy-extensions = ">=0.4.3"
+tomli = ">=1.1.0"
+typing-extensions = ">=3.10"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+python2 = ["typed-ast (>=1.4.0,<2)"]
+
+[[package]]
+name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "pathspec"
+version = "0.9.0"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+
+[[package]]
+name = "platformdirs"
+version = "2.4.1"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+
+[[package]]
+name = "pygments"
+version = "2.11.0"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "main"
+optional = true
+python-versions = ">=3.5"
+
+[[package]]
+name = "sgmllib3k"
+version = "1.0.0"
+description = "Py3k port of sgmllib."
+category = "main"
+optional = true
+python-versions = "*"
+
+[[package]]
+name = "tomli"
+version = "1.2.3"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "typing-extensions"
+version = "4.0.1"
+description = "Backported and Experimental Type Hints for Python 3.6+"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "vermin"
+version = "1.3.3"
+description = "Concurrently detect the minimum Python versions needed to run code"
+category = "dev"
+optional = false
+python-versions = ">=2.7"
+
+[extras]
+jinja2 = ["Jinja2"]
+prss = ["feedparser"]
+pygments = ["Pygments"]
+
+[metadata]
+lock-version = "1.1"
+python-versions = ">=3.8,<4"
+content-hash = "eedebf0b6e78c4e1fa28738ea11b5cb637b36821c647bdbc53456ab1cf477790"
+
+[metadata.files]
+black = [
+    {file = "black-21.12b0-py3-none-any.whl", hash = "sha256:a615e69ae185e08fdd73e4715e260e2479c861b5740057fde6e8b4e3b7dd589f"},
+    {file = "black-21.12b0.tar.gz", hash = "sha256:77b80f693a569e2e527958459634f18df9b0ba2625ba4e0c2d5da5be42e6f2b3"},
+]
+click = [
+    {file = "click-8.0.3-py3-none-any.whl", hash = "sha256:353f466495adaeb40b6b5f592f9f91cb22372351c84caeb068132442a4518ef3"},
+    {file = "click-8.0.3.tar.gz", hash = "sha256:410e932b050f5eed773c4cda94de75971c89cdb3155a72a0831139a79e5ecb5b"},
+]
+colorama = [
+    {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
+    {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
+]
+feedparser = [
+    {file = "feedparser-6.0.8-py3-none-any.whl", hash = "sha256:1b7f57841d9cf85074deb316ed2c795091a238adb79846bc46dccdaf80f9c59a"},
+    {file = "feedparser-6.0.8.tar.gz", hash = "sha256:5ce0410a05ab248c8c7cfca3a0ea2203968ee9ff4486067379af4827a59f9661"},
+]
+isort = [
+    {file = "isort-5.10.1-py3-none-any.whl", hash = "sha256:6f62d78e2f89b4500b080fe3a81690850cd254227f27f75c3a0c491a1f351ba7"},
+    {file = "isort-5.10.1.tar.gz", hash = "sha256:e8443a5e7a020e9d7f97f1d7d9cd17c88bcb3bc7e218bf9cf5095fe550be2951"},
+]
+jinja2 = [
+    {file = "Jinja2-3.0.3-py3-none-any.whl", hash = "sha256:077ce6014f7b40d03b47d1f1ca4b0fc8328a692bd284016f806ed0eaca390ad8"},
+    {file = "Jinja2-3.0.3.tar.gz", hash = "sha256:611bb273cd68f3b993fabdc4064fc858c5b47a973cb5aa7999ec1ba405c87cd7"},
+]
+markupsafe = [
+    {file = "MarkupSafe-2.0.1-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:d8446c54dc28c01e5a2dbac5a25f071f6653e6e40f3a8818e8b45d790fe6ef53"},
+    {file = "MarkupSafe-2.0.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:36bc903cbb393720fad60fc28c10de6acf10dc6cc883f3e24ee4012371399a38"},
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..4a340da
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,38 @@
+[tool.poetry]
+name = "patternutils"
+version = "0.0.12"
+description = "Combine regular expressions with template engines in a powerful matter."
+authors = ["Dennis Fink <dennis.fink@c3l.lu>"]
+license = "GPL-3.0-or-later"
+repository = "https://projects.metalgamer.eu/patternutils"
+
+[tool.poetry.scripts]
+pmatch = "patternutils.commands.pmatch:pmatch"
+targs = "patternutils.commands.targs:targs"
+tmv = "patternutils.commands.tmv:tmv"
+tln = "patternutils.commands.tln:tln"
+patterncfg = "patternutils.commands.patterncfg:patterncfg"
+prss = "patternutils.commands.prss:prss"
+pjson = "patternutils.commands.pjson:pjson"
+
+[tool.poetry.dependencies]
+python = ">=3.8,<4"
+click = "^8.0.3"
+Jinja2 = {version = "^3.0.3", optional = true}
+Pygments = {version = "^2.10.0", optional = true}
+feedparser = {version = "^6.0.8", optional = true}
+
+[tool.poetry.dev-dependencies]
+mypy = "^0.930"
+black = "^21.12b0"
+isort = "^5.10.1"
+vermin = "^1.3.2"
+
+[tool.poetry.extras]
+jinja2 = ["Jinja2"]
+pygments = ["Pygments"]
+prss = ["feedparser"]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 01156a3..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-Click==7.0
-Jinja2==2.10.3
-MarkupSafe==1.1.1
-Pygments==2.4.2
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 95a892f..0000000
--- a/setup.py
+++ /dev/null
@@ -1,53 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-from setuptools import find_packages, setup
-
-NAME = "patternutils"
-DESCRIPTION = "Combine regular expressions with template engines in a powerful matter."
-URL = "https://projects.metalgamer.eu/patternutils"
-EMAIL = "dennis.fink@c3l.lu"
-AUTHOR = "Dennis Fink"
-
-VERSION = "0.0.8"
-ENTRY_POINTS = {
-    "console_scripts": [
-        "pmatch=patternutils.commands.pmatch:pmatch",
-        "targs=patternutils.commands.targs:targs",
-        "tmv=patternutils.commands.tmv:tmv",
-        "tln=patternutils.commands.tln:tln",
-        "patterncfg=patternutils.commands.patterncfg:patterncfg",
-    ],
-}
-
-
-REQUIRED = [
-    "click==7.0",
-]
-
-OPTIONAL = {
-    "jinja2": ["Jinja2==2.10.1"],
-    "pygments": ["Pygments==2.4.2"],
-}
-
-setup(
-    name=NAME,
-    version=VERSION,
-    description=DESCRIPTION,
-    author=AUTHOR,
-    author_email=EMAIL,
-    url=URL,
-    packages=find_packages(exclude=("tests",)),
-    entry_points=ENTRY_POINTS,
-    install_requires=REQUIRED,
-    extras_requires=OPTIONAL,
-    include_package_data=True,
-    license="GPLv3+",
-    classifiers=[
-        # Trove classifiers
-        # Full list: https://pypi.python.org/pypi?%3Aaction=list_classifiers
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: Implementation :: CPython",
-    ],
-)