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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+ Copyright (C) 2007 Free Software Foundation, Inc. <>
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+                     END OF TERMS AND CONDITIONS
+            How to Apply These Terms to Your New Programs
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+the "copyright" line and a pointer to where the full notice is found.
+ -- Command-line note taking utility
+    Copyright (C) 2013  Károly Kiripolszky
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    GNU General Public License for more details.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <>.
+Also add information on how to contact you by electronic and paper mail.
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+  Copyright (C) 2013  Károly Kiripolszky
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+ -- Command-line notebook program with YAML persistence
+ is written in Python3. To use you need to have PyYAML on your system::
+    sudo pip3 install pyyaml
+For convenient usage I recommend to create an alias or a symlink to, for example::
+    alias n="/path/to/"
+    sudo ln -s /path/to/ /usr/sbin/n
+Adding notes
+Adding a new note::
+    n add Do not forget about this
+Adding a new note with one or more tags::
+    n add -t music,title Brian Bennett - Solstice
+    n add -t todo Fix bug in
+Use quotes if the text contains characters special to the terminal (*, ?, etc.)::
+    n add "Does this work? Yes!"
+You can use the -s option to read longer text from stdin (press Ctrl+D to save the note)::
+    n add -t spam -s
+When a note was successfully added the id of the note will be printed prefixed by a + sign.
+Please type ``n add --help`` for further information.
+Listing notes
+Getting a list of all notes::
+    n list
+Getting the last note only::
+    n list 1
+Getting 10 notes from the fifth note (paging)::
+    n list 10 5
+Display last 10 notes having the #todo tag::
+    n list -t todo 10
+Please type ``n list --help`` for further information.
+Editing notes
+You can open your notes file in an editor by typing the command::
+    n edit
+Note YAML format
+The notebook file is a series of YAML documents. A single note looks like this::
+    ---
+    date: [date in SQL format: %Y-%m-%d %H:%M:%S]
+    id: [an arbitrary id for the note, an UUID will be generated when empty]
+    author: [name of author]
+    text: <content of the note (required)>
+    tags:
+    - one_or
+    - more
+    - tags
+As you can see *only the text part is required*. You can use the options of the ``add`` subcommand to specify other data,
+such as tags, id, etc. When omitted the metadata will have these default values:
+======  =========================
+Name    Default value
+======  =========================
+date    Date when note was added.
+id      A random UUID.
+author  Unix username.
+tags    *None*
+======  =========================
+The configuration file
+By default, looks for and reads a file called ``.noterc' in your home directory. You can specify a different
+location by setting the ``NOTERC`` environment variable to a file path. The config file is a common INI file, you can
+set any options shown in the first section by the ``n info`` command. Put your options under the ``[note]`` section.
+Here's an example ``.noterc`` file::
+    [note]
+    file = ~/Dropbox/notes.yaml
+    editor = vim
+In the example above I set my notes file to a location under my Dropbox folder, so I can synchronise my notebook across
+devices pretty easily. You can also specify the tag separator, the note display template, name of the author, etc.
+Note templates
+There are two kinds of templates in *builtin* and *external*. You can customize both. To customize the *builtin*
+template you can either specify it using the command-line option ``-s`` or set it in your ``.noterc``::
+    n list -s :it 5
+    (This will print only the id and the text of the last five notes.)
+Or in your ``.noterc`` it would look like this::
+    [note]
+    format = :it
+An *external* template is a text file that describes the format of a single note. To get your notes in XML for example
+you can set your template file and tag separator like this:
+Template file (``xml_template.txt``)::
+    <note id="{id}" author="{author}" date="{date}">
+        <text>{text}</text>
+        <tags>
+            <tag>{tags}</tag>
+        </tags>
+    </note>
+The ``.noterc`` file::
+    [note]
+    template_file = xml_template.txt
+    tagsep = </tag><tag>
+Or if you want to get XML output only on occasion, you can use the command line::
+    n -t </tag><tag> list -f xml_template.xml 5
+This will list the last five notes as XML according to the format you've specified in the template.
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# GNU General Public License for more details.
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <>.
+__author__ = "Károly Kiripolszky <>"
+__version__ = (0, 1, 0)
+import sys
+from sys import exit
+import os
+import argparse
+import codecs
+import stat
+from uuid import uuid4
+import re
+import configparser
+import pwd
+import subprocess
+from datetime import datetime
+    import yaml
+except ImportError:
+    yaml = None
+    print("ERROR: PyYAML not found. Grab it here:\n\t")
+    raise
+# program defaults (overriden by .noterc)
+NOTESFILE = "~/notes.yaml"
+ENCODING = "utf-8"
+RCFILE = "~/.noterc"
+TAGSEP = ","
+TEMPLATE = ":dtg"
+# ------------------
+# ------------------
+def readrc(path=None):
+    cfg = configparser.ConfigParser()
+    try:
+        # "note" is the default section
+        if "note" not in cfg:
+            raise AttributeError
+    except AttributeError:
+        cfg['note'] = dict(loaded=False)
+    cfg = cfg['note']
+    # options white-list
+    tplfile = cfg.get("tplfile")
+    config = dict(
+        author=cfg.get("author", pwd.getpwuid(os.getuid())[0]),
+        notesfile=os.path.abspath(os.path.expanduser(cfg.get("file", NOTESFILE))),
+        template_file=os.path.abspath(os.path.expanduser(tplfile)) if tplfile is not None else None,
+        template=cfg.get("format", TEMPLATE),
+        encoding=cfg.get("encoding", ENCODING),
+        tagsep=cfg.get("tagsep", TAGSEP),
+        editor=cfg.get("editor", os.getenv("EDITOR")),
+        silent=cfg.getboolean("silent", False),
+        loaded=cfg.getboolean("loaded", True))
+    return config
+def read_notesfile(path, encoding=ENCODING):
+    with, "r", encoding) as f:
+        notes = yaml.load_all(
+    notes = list(notes)
+    if not notes:
+        print("empty.")
+        return []
+    return notes
+def tags_to_list(tags, tagsep=TAGSEP):
+    if type(tags) == str:
+        return [s.strip() for s in tags.split(tagsep)]
+    elif type(tags) == list:
+        return tags
+    return []
+def tags_to_string(tags, tagsep=TAGSEP):
+    if type(tags) == str:
+        tags = tags.split(tagsep)
+    tags = "{} ".format(tagsep).join(["#{}".format(tag) for tag in tags])
+    return tags
+def display_note(note, tagsep=TAGSEP, template=None):
+    note['text'] = note['text'].strip()
+    template = TEMPLATE if template is None else str(template)
+    # if builtin template:
+    if 1 < len(template) <= 6 and template.startswith(":"):
+        note['tags'] = tags_to_string(note['tags'], tagsep=tagsep) if "tags" in note else ""
+        # elements have fixed positions
+        tmp = ""
+        show_header = False
+        show_text = False
+        if "a" in template:
+            tmp = "{0[author]}".format(note)
+            show_header = True
+        if "d" in template:
+            tmp = "{0}@ {1[date]}".format(
+                "{} ".format(tmp) if 0 < len(tmp) else "",
+                note)
+            show_header = True
+        if "i" in template:
+            tmp = "{1}{0}id:{2[id]}".format(
+                " " if show_header else "",
+                tmp,
+                note)
+            show_header = True
+        if "t" in template:
+            tmp = "{1}{0}{2[text]}".format(
+                "\n" if show_header else "",
+                tmp,
+                note)
+            show_text = True
+        if "g" in template:
+            tmp = "{1}{0}{2[tags]}".format(
+                "\n" if show_text or show_header else "",
+                tmp,
+                note)
+        template = "---\n{}".format(tmp)
+        print(template)
+        return
+    try:
+        note['tags'] = tagsep.join(note['tags'])
+        print(template.strip().format(**note))
+    except KeyError:
+        print("unknown variable in template string: {}".format(sys.exc_info()[1]))
+        exit(1)
+def has_tag(searched_tags, tags=None):
+    if not searched_tags or not tags:
+        return False
+    for needle in searched_tags:
+        re_tag = re.compile(needle, re.IGNORECASE)
+        for tag in tags:
+            if re_tag.match(tag) is not None:
+                return True
+    return False
+def filter_notes(notes, author=None, tags=None, txt=None, idpattern=None):
+    if type(notes) != list:
+        print("what?")
+        raise TypeError
+    if len(notes) < 1:
+        print("empty.")
+        raise StopIteration
+    # split string into list of tags
+    tags = tags_to_list(tags)
+    # verify and setup filters
+    by_author = author is not None
+    re_author = re.compile(author, re.IGNORECASE) if by_author else None
+    by_idpattern = idpattern is not None
+    re_idpattern = re.compile(idpattern, re.IGNORECASE) if by_idpattern else None
+    by_txt = txt is not None
+    re_txt = re.compile(txt, re.IGNORECASE) if by_txt else None
+    by_tags = bool(len(tags))
+    # make text lowercase for case-insensitive searching
+    results = []
+    # refactored 'if' statements outside of loop
+    if by_tags and not (by_author or by_idpattern or by_txt):
+        for note in notes:
+            if not has_tag(tags, note.get("tags", [])):
+                continue
+            results.append(note)
+    elif by_tags or by_author or by_txt or by_idpattern:
+        for note in notes:
+            if by_tags and not has_tag(tags, note.get("tags", [])):
+                continue
+            if by_author and re_author.match(note.get("name", "")) is None:
+                continue
+            if by_txt and re_txt.match(note.get("text", "")) is None:
+                continue
+            if by_idpattern and re_idpattern.match(note.get("id", "")) is None:
+                continue
+            results.append(note)
+    else:
+        for note in notes:
+            results.append(note)
+    return results
+def slice_notes(notes, limit=0, offset=0, silent=False):
+    maxnotes = len(notes)
+    notes = notes[offset:offset + limit]
+    if silent:
+        return notes
+    sliced_maxnotes = len(notes)
+    if not sliced_maxnotes:
+        return notes
+        # if paging is off
+    if not offset and limit == maxnotes:
+        print("# total: {}".format(maxnotes))
+    # else slice results into pages
+    elif limit < maxnotes or 0 < offset:
+        maxvisible = limit if 0 < limit <= sliced_maxnotes else sliced_maxnotes
+        print("# total: {0:d}; view: {2:d}...{3:d} (count: {1:d})".format(
+            maxnotes,
+            maxvisible,
+            offset if 0 < offset else 1,
+            offset + limit if limit + offset < maxnotes else maxnotes))
+    return notes
+def dict_to_yaml(d):
+    yml = yaml.dump(d, explicit_start=True, allow_unicode=True, default_flow_style=False)
+    return yml.strip()
+# -----------
+# -----------
+def cmd_add(args):
+    """Add a new note."""
+    if args.from_stdin:
+        args.text = "".join(sys.stdin.readlines()).rstrip()
+    else:
+        args.text = " ".join(list(args.text)).rstrip()
+        # note dict
+    note = dict(
+        id=uuid4().hex if not else,
+        author=rcdefs['author'] if is None else,
+"%Y-%m-%d %H:%M:%S"),
+        text=args.text)
+    # parse string argument to list
+    tags = tags_to_list(args.tags, args.tagsep)
+    # add tags attribute if there is at least one tag
+    if 0 < len(tags):
+        note['tags'] = tags[0] if len(tags) == 1 else tags
+    with, "a", args.encoding) as f:
+        f.write("{0}\n".format(dict_to_yaml(note)))
+    print("+{0}".format(note['id']))
+def cmd_list(args):
+    """List notes."""
+    notes = read_notesfile(args.notesfile, encoding=args.encoding)
+    if args.show_total:
+        print("# total: {0:d}".format(len(notes)))
+        raise SystemExit
+    if not args.ascending:
+        notes = notes[::-1]
+    filtered_notes = filter_notes(
+        notes,
+        tags=args.tags,
+        txt=args.match_string,
+        idpattern=args.idpattern)
+    if not filtered_notes:
+        print("# empty.")
+        return
+    maxvisible = len(filtered_notes)
+    limit = args.limit if 0 < args.limit <= maxvisible else maxvisible
+    offset = args.offset if 0 < args.offset else 0
+    sliced_notes = slice_notes(filtered_notes, limit, offset, args.silent)
+    if not sliced_notes:
+        print("# empty.")
+        return
+    if args.template_file is not None:
+        with open(str(args.template_file), "r") as tplf:
+            args.template =
+    try:
+        if args.yaml_format:
+            print("%YAML 1.1")
+            for note in sliced_notes:
+                print(dict_to_yaml(note))
+        else:
+            for note in sliced_notes:
+                display_note(note, tagsep=args.tagsep, template=args.template)
+    except Exception:
+        print("unable to render list.")
+        raise
+def cmd_tags(args):
+    """List tags."""
+    notes = read_notesfile(args.notesfile)
+    tags = {}
+    maxlen = 0
+    for note in notes:
+        if "tags" not in note:
+            continue
+        note_tags = tags_to_list(note['tags'])
+        for tag in note_tags:
+            maxlen = len(tag) + 4 if maxlen < len(tag) else maxlen
+            tags[tag] = True
+    tags = list(tags.keys())
+    lentags = len(tags)
+    if lentags == 0:
+        print("# empty.")
+        return
+    if not args.silent:
+        print("# number of tags: {0:d}".format(lentags))
+    tags.sort(reverse=args.descending)
+    if args.columns:
+        if lentags % 2 != 0:
+            tags.append(" ")
+            lentags += 1
+        split = int(lentags / 2)
+        col1, col2 = tags[:split], tags[split:]
+        for s1, s2 in zip(col1, col2):
+            print("".join(["#{0:<", str(maxlen), "s}", "{1}"]).format(s1,
+                                                                      "#{0}".format(s2) if 0 < len(s2.strip()) else ""))
+    else:
+        print("#{0}".format("{0} #".format(args.tagsep).join(tags)))
+def cmd_edit(args):
+    """Open note file in an editor."""
+    if args.editor is None:
+        print("EDITOR env var not set.")
+        raise ValueError
+    cmln = "{0} {1}".format(args.editor, args.notesfile)
+, shell=True)
+    raise SystemExit
+def cmd_info(args):
+    """Show settings and status information."""
+    if args.silent:
+        return
+    print("""# INFO on {version} by {me}
+file:     {path}
+encoding: {encoding}
+tplfile:  {tpl}
+format:   {template}
+editor:   {editor}
+author:   {author}
+tagsep:   {tagsep}
+rcfile:   {rcfile}
+cwd:      {cwd}
+py:       {this_file}""".format(
+        version=".".join(map(str, __version__)),
+        me=__author__,
+        path=args.notesfile,
+        encoding=args.encoding,
+        tpl=args.template_file if args.template_file is not None else "<NOT SET>",
+        tagsep=args.tagsep,
+        rcfile=args.rcfile if rcdefs['loaded'] else "{} <NOT FOUND>".format(args.rcfile),
+        template=args.template,
+        editor=args.editor if args.editor is not None else "<NOT SET>",
+        cwd=os.getcwd(),
+        this_file=__file__))
+def parse_args():
+    # load rc file with defaults
+    global rcdefs
+    rcfile = os.environ["NOTERC"] if "NOTERC" in os.environ else RCFILE
+    rcfile = os.path.abspath(os.path.expanduser(rcfile))
+    rcdefs = readrc(rcfile)
+    # create argument parser
+    parser = argparse.ArgumentParser(
+        prog="note",
+        description="Command-line notebook program with YAML persistence.",
+        epilog="""You can change the location of the .rcfile by setting the the NOTERC environment variable.
+In that file you can set all the arguments listed in info, except for rcfile, cwd and py...
+To see the location of the .rcfile use the *info* command.""")
+    # general arguments
+    parser.add_argument(
+        "-s", "--silent", dest="silent", action="store_true", default=rcdefs['silent'],
+        help="hide header and footer")
+    parser.add_argument(
+        "-a", "--author", dest="author", metavar="NAME", default=None,
+        help="set the name of the author")
+    parser.add_argument(
+        "-t", "--tagsep", dest="tagsep", default=rcdefs['tagsep'],
+        help="tag separator (default: '%(default)s')")
+    parser.add_argument(
+        "-f", "--file", dest="notesfile", default=rcdefs['notesfile'],
+        help="use the given note file (default: '%(default)s')")
+    parser.add_argument(
+        "-e", "--encoding", dest="encoding", default=rcdefs['encoding'],
+        help="set encoding (default: {})".format(rcdefs['encoding']))
+    parser.add_argument(
+        "-v", "--version", action="version", help="show version and exit",
+        version=".".join(map(str, __version__)))
+    parser.set_defaults(
+        rcfile=rcfile,
+        template=rcdefs['template'],
+        template_file=rcdefs['template_file'],
+        editor=rcdefs['editor'])
+    # add subcommands subparser
+    subparsers = parser.add_subparsers(title="subcommands")
+    # subcommand: add note
+    cmd = subparsers.add_parser(
+        "add", description="Adds a new note.", help="add a new note")
+    cmd.add_argument(
+        "text", nargs="*", help="some text (multiple words will be space-separated)")
+    cmd.add_argument(
+        "-t", "--tag", dest="tags", help="tags (default separator: '{}')".format(TAGSEP))
+    cmd.add_argument(
+        "-i", "--id", dest="id", help="use the specified id")
+    cmd.add_argument(
+        "-s", "--stdin", dest="from_stdin", action="store_true",
+        help="read the text of the note from stdin")
+    cmd.set_defaults(func=cmd_add)
+    # subcommand: list notes
+    cmd = subparsers.add_parser(
+        "list", description="""Shows the list of notes.
+You can use *format string* shortcuts like ':dtg', ':nditg'. A shortcut string
+must be at most 6 characters long and begin with with a colon. This feature
+works with builtin template only.""",
+        help="show the list of notes")
+    cmd.add_argument("limit", type=int, nargs="?", default=0, help="limit the number of notes")
+    cmd.add_argument("offset", type=int, nargs="?", default=0, help="first index of the list")
+    cmd.add_argument("-m", "--match", dest="match_string", metavar="REGEX", help="set match string")
+    cmd.add_argument("-t", "--tag", dest="tags", metavar="REGEX", help="tags (default separator: '{}')".format(TAGSEP))
+    cmd.add_argument("-i", "--idpattern", dest="idpattern", metavar="REGEX", help="match the given id pattern")
+    cmd.add_argument("-a", "--ascending", dest="ascending", action="store_true", help="sort in ascending order")
+    cmd.add_argument("-y", "--yaml", dest="yaml_format", action="store_true", help="output entries as YAML")
+    cmd.add_argument(
+        "-s", "--format", dest="template", metavar="STRING", default=rcdefs['template'],
+        help="set custom output format (default: '%(default)s')")
+    cmd.add_argument(
+        "-f", "--format-file", dest="template_file", metavar="FILE", default=rcdefs['template_file'],
+        help="read custom output format from file (default: '%(default)s')")
+    cmd.add_argument(
+        "-n", "--total", dest="show_total", action="store_true",
+        help="show total number of notes and exit")
+    cmd.set_defaults(func=cmd_list)
+    # subcommand: list tags
+    cmd = subparsers.add_parser("tags", description="Shows the list of tags.", help="show the list of tags")
+    cmd.add_argument("-c", "--columns", dest="columns", action="store_true", help="display columns")
+    cmd.add_argument("-d", "--descending", dest="descending", action="store_true", help="sort in descending order")
+    cmd.set_defaults(func=cmd_tags)
+    # subcommand: launch editor
+    cmd = subparsers.add_parser(
+        "edit", description="Opens the notes with the default editor.",
+        help="open the notes with the default editor")
+    cmd.set_defaults(func=cmd_edit)
+    # subcommand: show info
+    cmd = subparsers.add_parser(
+        "info", description="Shows runtime information.",
+        help="show runtime information")
+    cmd.set_defaults(func=cmd_info)
+    # parse arguments
+    args = parser.parse_args()
+    if "func" not in args:
+        # no subcommand specified
+        parser.print_help()
+    return args.func, args
+if __name__ == "__main__":
+    try:
+        fun, parsed_args = parse_args()
+        fun(parsed_args)
+    except IOError:
+        print("cannot access: '{0[1]}".format(str(sys.exc_info()[1]).split(" '")))
+        exit(1)
+    else:
+        if not parsed_args.silent:
+            print("...")