Support for many references and refactor.

- Moves shared command code to helpers module.
- Implements reference(s) argument for commands:
  + a helper to add single or multi-reference argument to parser,
  + two functions to transform this argument into a list of citekeys.

papers/commands/add_cmd.py

@@ -2,28 +2,7 @@ from .. import repo
 from .. import files
 from ..paper import Paper, NoDocumentFile, get_bibentry_from_string
 from .. import configs
-
-
-def add_paper_with_docfile(repo, paper, docfile=None, copy=False):
-    repo.add_paper(paper)
-    if docfile is not None:
-        if copy:
-            repo.import_document(paper.citekey, docfile)
-        else:
-            paper.set_external_document(docfile)
-            repo.add_or_update(paper)
-
-
-def extract_doc_path_from_bibdata(paper, ui):
-    try:
-        file_path = paper.get_document_file_from_bibdata(remove=True)
-        if files.check_file(file_path):
-            return file_path
-        else:
-            ui.warning("File does not exist for %s (%s)."
-                       % (paper.citekey, file_path))
-    except NoDocumentFile:
-        return None
+from .helpers import add_paper_with_docfile, extract_doc_path_from_bibdata
 
 
 def parser(subparsers, config):

papers/commands/edit_cmd.py

@@ -1,21 +1,21 @@
 from ..files import editor_input
 from .. import repo
 from ..paper import get_bibentry_from_string, get_safe_metadata_from_content
+from .helpers import add_references_argument, parse_reference
 
 
 def parser(subparsers, config):
     parser = subparsers.add_parser('edit',
             help='open the paper bibliographic file in an editor')
-    parser.add_argument('reference',
-            help='reference to the paper (citekey or number)')
     parser.add_argument('-m', '--meta', action='store_true', default=False,
             help='edit metadata')
+    add_references_argument(parser, single=True)
     return parser
 
 
-def command(config, ui, reference, meta):
+def command(config, ui, meta, reference):
     rp = repo.Repository.from_directory(config)
-    key = rp.citekey_from_ref(reference, fatal=True)
+    key = parse_reference(ui, rp, reference)
     paper = rp.paper_from_citekey(key)
     to_edit = 'bib'
     if meta:

papers/commands/export_cmd.py

@@ -4,6 +4,7 @@ from pybtex.database import BibliographyData
 
 from .. import repo
 from .. import files
+from .helpers import parse_references, add_references_argument
 
 
 def parser(subparsers, config):
@@ -11,16 +12,21 @@ def parser(subparsers, config):
             help='export bibliography')
     parser.add_argument('-f', '--bib-format', default='bibtex',
             help="export format")
+    add_references_argument(parser)
     return parser
 
 
-def command(config, ui, bib_format):
+def command(config, ui, bib_format, references):
     """
     :param bib_format       (in 'bibtex', 'yaml')
     """
     rp = repo.Repository.from_directory(config)
+    papers = [rp.paper_from_citekey(c)
+              for c in parse_references(ui, rp, references)]
+    if len(papers) == 0:
+        papers = rp.all_papers()
     bib = BibliographyData()
-    for p in rp.all_papers():
+    for p in papers:
         bib.add_entry(p.citekey, p.bibentry)
     try:
         files.write_bibdata(bib, sys.stdout, bib_format)

papers/commands/helpers.py

@@ -0,0 +1,48 @@
+from .. import files
+from .. import color
+from ..repo import InvalidReference
+
+
+def add_references_argument(parser, single=False):
+    if single:
+        parser.add_argument('reference',
+                help='reference to the paper (citekey or number)')
+    else:
+        parser.add_argument('references', nargs='*',
+                help="one or several reference to export (citekeysor numbers)")
+
+
+def add_paper_with_docfile(repo, paper, docfile=None, copy=False):
+    repo.add_paper(paper)
+    if docfile is not None:
+        if copy:
+            repo.import_document(paper.citekey, docfile)
+        else:
+            paper.set_external_document(docfile)
+            repo.add_or_update(paper)
+
+
+def extract_doc_path_from_bibdata(paper, ui):
+    try:
+        file_path = paper.get_document_file_from_bibdata(remove=True)
+        if files.check_file(file_path):
+            return file_path
+        else:
+            ui.warning("File does not exist for %s (%s)."
+                       % (paper.citekey, file_path))
+    except NoDocumentFile:
+        return None
+
+
+def parse_reference(ui, rp, ref):
+    try:
+        return rp.citekey_from_ref(ref)
+    except InvalidReference:
+        ui.error("no paper with reference: %s."
+                    % color.dye(ref, color.citekey))
+        ui.exit(-1)
+
+
+def parse_references(ui, rp, refs):
+    citekeys = [parse_reference(ui, rp, ref) for ref in refs]
+    return citekeys

papers/commands/import_cmd.py

@@ -1,6 +1,6 @@
 from .. import repo
 from ..paper import Paper
-from add_cmd import add_paper_with_docfile, extract_doc_path_from_bibdata
+from .helpers import add_paper_with_docfile, extract_doc_path_from_bibdata
 from .. import configs
 
 

papers/commands/open_cmd.py

@@ -4,6 +4,7 @@ from .. import repo
 from ..paper import NoDocumentFile
 from .. import configs
 from .. import color
+from .helpers import add_references_argument, parse_reference
 
 
 def parser(subparsers, config):
@@ -11,14 +12,14 @@ def parser(subparsers, config):
             help='open the paper in a pdf viewer')
     parser.add_argument('-w', '--with', dest='with_command', default=None,
             help='command to use to open the document file')
-    parser.add_argument('citekey',
-            help='the paper associated citekey')
+    add_references_argument(parser, single=True)
     return parser
 
 
-def command(config, ui, with_command, citekey):
+def command(config, ui, with_command, reference):
     rp = repo.Repository.from_directory(config)
-    paper = rp.paper_from_ref(citekey, fatal=True)
+    key = parse_reference(ui, rp, reference)
+    paper = rp.paper_from_citekey(key)
     if with_command is None:
         with_command = config.get(configs.MAIN_SECTION, 'open-cmd')
     try:
@@ -27,7 +28,7 @@ def command(config, ui, with_command, citekey):
         ui.print_('{} opened.'.format(color.dye(filepath, color.filepath)))
     except NoDocumentFile:
         ui.error('No document associated with the entry {}.'.format(
-                 color.dye(citekey, color.citekey)))
+                 color.dye(key, color.citekey)))
         ui.exit()
     except OSError:
         ui.error("Command does not exist: %s." % with_command)

papers/commands/remove_cmd.py

@@ -1,20 +1,21 @@
 from .. import repo
 from .. import color
+from .helpers import add_references_argument, parse_references
+
 
 def parser(subparsers, config):
     parser = subparsers.add_parser('remove', help='removes a paper')
-    parser.add_argument('reference',
-            help='reference to the paper (citekey or number)')
+    add_references_argument(parser)
     return parser
 
 
-def command(config, ui, reference):
+def command(config, ui, references):
     rp = repo.Repository.from_directory(config)
-    key = rp.citekey_from_ref(reference, fatal=True)
-    paper = rp.paper_from_citekey(key)
-    are_you_sure = ("Are you sure you want to delete paper [%s]"
+    citekeys = parse_references(ui, rp, references)
+    are_you_sure = ("Are you sure you want to delete paper(s) [%s]"
         " (this will also delete associated documents)?"
-        % color.dye(paper.citekey, color.citekey))
+        % ', '.join([color.dye(c, color.citekey) for c in citekeys]))
     sure = ui.input_yn(question=are_you_sure, default='n')
     if sure:
-        rp.remove(paper.citekey)
+        for c in citekeys:
+            rp.remove(c)

papers/repo.py

@@ -4,7 +4,6 @@ import glob
 
 from . import files
 from .paper import PaperInRepo, NoDocumentFile
-from . import color
 from . import configs
 
 
@@ -19,6 +18,10 @@ class CiteKeyAlreadyExists(Exception):
     pass
 
 
+class InvalidReference(Exception):
+    pass
+
+
 class Repository(object):
 
     def __init__(self, config=None):
@@ -37,7 +40,7 @@ class Repository(object):
                 self, self.path_to_paper_file(citekey, 'bib'),
                 metapath=self.path_to_paper_file(citekey, 'meta'))
 
-    def citekey_from_ref(self, ref, fatal=True):
+    def citekey_from_ref(self, ref):
         """Tries to get citekey from given ref.
         Ref can be a citekey or a number.
         """
@@ -47,15 +50,10 @@ class Repository(object):
             try:
                 return self.citekeys[int(ref)]
             except (IndexError, ValueError):
-                if fatal:
-                    print('{}: no paper with reference {}'.format(
-                          color.dye('error', color.error),
-                          color.dye(ref, color.citekey)))
-                    exit(-1)
-                raise(IOError('file not found'))
-
-    def paper_from_ref(self, ref, fatal=True):
-        key = self.citekey_from_ref(ref, fatal=fatal)
+                raise(InvalidReference)
+
+    def paper_from_ref(self, ref):
+        key = self.citekey_from_ref(ref)
         return self.paper_from_citekey(key)
 
     # creating new papers