Add API get_max_id(), -p -1 shows max index

README.md

@@ -198,6 +198,7 @@ POWER TOYS:
       -m, --merge file     add bookmarks from another buku DB file
       -p, --print [...]    show record details by indices, ranges
                            print all bookmarks, if no arguments
+                           -1 shows the bookmark with highest index
       -f, --format N       limit fields in -p or Json search output
                            N=1: URL, N=2: URL and tag, N=3: title
       -r, --replace oldtag [newtag ...]

buku.1

@@ -175,7 +175,7 @@ is considered Markdown (compliant with --export format) if it has '.md' extensio
 Add bookmarks from another Buku database file.
 .TP
 .BI \-p " " \--print " [...]"
-Show details (DB index, URL, title, tags and comment) of bookmark record by DB index. If no arguments, all records with actual index from DB are shown. Accepts hyphenated ranges and space-separated indices.
+Show details (DB index, URL, title, tags and comment) of bookmark record by DB index. If no arguments, all records with actual index from DB are shown. Accepts hyphenated ranges and space-separated indices. Special index -1 (introduced for convenience) shows the details of the bookmark with the highest index.
 .TP
 .BI \-f " " \--format " N"
 Show selective monochrome output with specific fields. Works with --print. Search results honour the option when used along with --json. Useful for creating batch scripts.

buku.py

@@ -472,6 +472,19 @@ class BukuDb:
 
         return -1
 
+    def get_max_id(self):
+        '''Fetch the ID of the last record
+
+        :return: ID if any record exists, else -1
+        '''
+
+        self.cur.execute('SELECT MAX(id) from bookmarks')
+        resultset = self.cur.fetchall()
+        if resultset[0][0] is None:
+            return -1
+
+        return resultset[0][0]
+
     def add_rec(self, url, title_in=None, tags_in=None, desc=None, immutable=0,
                 delay_commit=False):
         '''Add a new bookmark
@@ -989,10 +1002,9 @@ class BukuDb:
         :param delay_commit: do not commit to DB, caller's responsibility
         '''
 
-        self.cur.execute('SELECT MAX(id) from bookmarks')
-        results = self.cur.fetchall()
         # Return if the last index left in DB was just deleted
-        if results[0][0] is None:
+        max_id = self.get_max_id()
+        if max_id == -1:
             return
 
         query1 = ('SELECT id, URL, metadata, tags, desc FROM bookmarks '
@@ -1001,18 +1013,17 @@ class BukuDb:
         query3 = ('INSERT INTO bookmarks(id, URL, metadata, tags, desc) '
                   'VALUES (?, ?, ?, ?, ?)')
 
-        for row in results:
-            if row[0] > index:
-                self.cur.execute(query1, (row[0],))
-                results = self.cur.fetchall()
-                for row in results:
-                    self.cur.execute(query2, (row[0],))
-                    self.cur.execute(query3,
-                                     (index, row[1], row[2], row[3], row[4],))
-                    if not delay_commit:
-                        self.conn.commit()
-                    if self.chatty:
-                        print('Index %d moved to %d' % (row[0], index))
+        if max_id > index:
+            self.cur.execute(query1, (max_id,))
+            results = self.cur.fetchall()
+            for row in results:
+                self.cur.execute(query2, (row[0],))
+                self.cur.execute(query3,
+                                 (index, row[1], row[2], row[3], row[4],))
+                if not delay_commit:
+                    self.conn.commit()
+                if self.chatty:
+                    print('Index %d moved to %d' % (row[0], index))
 
     def delete_rec(self, index, low=0, high=0, is_range=False,
                    delay_commit=False):
@@ -1137,6 +1148,13 @@ class BukuDb:
         '''
 
         if index != 0:  # Show record at index
+            # Show the last record if -1 is passed
+            if index == -1:
+                index = self.get_max_id()
+                if index == -1:
+                    logerr('Empty database')
+                    return
+
             try:
                 query = 'SELECT * FROM bookmarks WHERE id = ? LIMIT 1'
                 self.cur.execute(query, (index,))
@@ -2553,6 +2571,7 @@ POSITIONAL ARGUMENTS:
     -m, --merge file     add bookmarks from another buku DB file
     -p, --print [...]    show record details by indices, ranges
                          print all bookmarks, if no arguments
+                         -1 shows the bookmark with highest index
     -f, --format N       limit fields in -p or Json search output
                          N=1: URL, N=2: URL and tag, N=3: title
     -r, --replace oldtag [newtag ...]
@@ -2907,6 +2926,8 @@ POSITIONAL ARGUMENTS:
                         lower, upper = upper, lower
                     for _id in range(lower, upper + 1):
                         bdb.print_rec(_id)
+                elif idx == '-1':
+                    bdb.print_rec(idx)
                 else:
                     logerr('Invalid index or range to print')
                     bdb.close_quit(1)