From e6703218e956db94d6db164e8686652f6341f39c Mon Sep 17 00:00:00 2001
From: Robin Krahl <me@robin-krahl.de>
Date: Sat, 24 Mar 2018 19:29:47 +0100
Subject: Add fetch command to get BibTeX data for DOI

---
 bibtool/cli.py     | 27 +++++++++++++++++++++------
 bibtool/extract.py |  8 +++++++-
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/bibtool/cli.py b/bibtool/cli.py
index 63e3d5b..a6aa1bf 100644
--- a/bibtool/cli.py
+++ b/bibtool/cli.py
@@ -11,9 +11,22 @@ import click
 
 
 TYPE_FILE = click.Path(exists=True, file_okay=True, dir_okay=False)
+TYPE_FILENAME = click.Path(exists=False, file_okay=True, dir_okay=False)
 TYPE_DIR = click.Path(exists=True, file_okay=False, dir_okay=True)
 
 
+def _get_bibtex_filename(bibtex_data, directory, output=None):
+    assert bibtex_data.entries
+
+    entry = bibtex_data.entries[0]
+    if not output:
+        output = os.path.join(directory, entry['ID'] + '.bib')
+    elif not os.path.isabs(output):
+        output = os.path.join(directory, output)
+
+    return output
+
+
 @click.group()
 def cli():
     pass
@@ -29,6 +42,13 @@ def _extract(filename, print_all):
             return
 
 
+@cli.command('fetch')
+@click.argument('doi')
+def _fetch(doi):
+    bibtex_data = bibtool.extract.get_bibtex_data(doi)
+    print(bibtexparser.dumps(bibtex_data))
+
+
 @cli.command('import')
 @click.argument('filename', type=TYPE_FILE)
 @click.option('--directory', type=TYPE_DIR, default=os.getcwd())
@@ -43,11 +63,6 @@ def _import(filename, directory, delete, doi):
 
     bibtex_data = bibtool.extract.get_bibtex_data(doi)
 
-    if not bibtex_data.entries:
-        raise Exception('Did not find any Bibtex entry.')
-    if len(bibtex_data.entries) > 1:
-        raise Exception('Found more than one Bibtex entries.')
-
     entry = bibtex_data.entries[0]
     click.echo('Found one Bibtex entry: ' + entry['ID'])
     if click.confirm('Do you want to edit the entry?'):
@@ -66,7 +81,7 @@ def _import(filename, directory, delete, doi):
     click.confirm('Add {} to the repository?'.format(entry['ID']),
                   default=True, abort=True)
 
-    bibfilename = os.path.join(directory, entry['ID'] + '.bib')
+    bibfilename = _get_bibtex_filename(bibtex_data, directory)
     outfileext = os.path.splitext(filename)[1]
     outfilename = os.path.join(directory, entry['ID'] + outfileext)
 
diff --git a/bibtool/extract.py b/bibtool/extract.py
index 5793da6..824c077 100644
--- a/bibtool/extract.py
+++ b/bibtool/extract.py
@@ -57,4 +57,10 @@ def get_bibtex_data(doi):
     request = urllib.request.Request(url, headers=headers)
     with urllib.request.urlopen(request) as response:
         bibtex = response.read().decode('utf-8')
-    return bibtexparser.loads(bibtex)
+
+    bibtex_data = bibtexparser.loads(bibtex)
+    if not bibtex_data.entries:
+        raise Exception('Did not find any Bibtex entry.')
+    if len(bibtex_data.entries) > 1:
+        raise Exception('Found more than one Bibtex entries.')
+    return bibtex_data
-- 
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