TASK: Initial version with non working striping

rplugin/python3/neotags.py

@@ -0,0 +1,92 @@
+import neovim
+import os
+import fileinput
+import subprocess
+
+
+@neovim.plugin
+class NeotagsPlugin(object):
+
+    def __init__(self, nvim):
+        self.nvim = nvim
+        # TODO: Make configurable
+        self.tags_filename = 'tags'
+        # TODO: Make configurable
+        self.ctags_cmd = 'ctags'
+        # Perhaps fetch debugging settings?
+
+    # Check whether a single command is enough as it's triggered twice.
+    @neovim.autocmd(
+        'BufWritePost,FileWritePost',
+        pattern='*',
+        eval='expand("<afile>:p")'
+    )
+    def update_tags_for_file(self, filename):
+        self.filename = filename
+        pwd = self.nvim.funcs.execute('pwd').strip()
+        self.relative_filename = self.filename.replace(pwd, '').lstrip('\/')
+        self.log('Start updating tags for abs: ' + self.filename)
+        self.log('Start updating tags for rel: ' + self.relative_filename)
+
+        # TODO: Add locking
+
+        try:
+            self.strip_existing_tags()
+            self.generate_tags()
+        except ValueError:
+            self.log('No tags file found')
+
+    def strip_existing_tags(self):
+        tagsf = self.get_tags_file()
+        backup = '.bak'
+
+        file = fileinput.FileInput(files=tagsf, inplace=True, backup=backup)
+        try:
+            for line in file:
+                if self.relative_filename not in line:
+                    self.log('Keep line: ' + line)
+                    print(line)
+                else:
+                    self.log('Remove line: ' + line)
+        finally:
+            file.close()
+            try:
+                os.unlink(tagsf + backup)
+            except FileNotFoundError:
+                pass
+        # with fileinput.input(files=tagsf, inplace=True, backup=backup) as f:
+        #     self.log('Lookup' + self.relative_filename)
+        #     for line in f:
+        #         self.log('Line: ' + line)
+        #         if self.relative_filename not in line:
+        #             self.log('Keep line')
+        #             print(line)
+        #         else:
+        #             self.log('Remove line')
+
+    def generate_tags(self):
+        finished = subprocess.run([
+            self.ctags_cmd,
+            '-f',
+            self.get_tags_file(),
+            '-a',
+            "%s" % self.relative_filename
+        ])
+
+        if finished.stderr:
+            self.log('Error:' + finished.stderr)
+        if finished.stdout:
+            self.log('Output:' + finished.stdout)
+        if finished.returncode:
+            self.log('Code:' + finished.returncode)
+
+    def get_tags_file(self):
+        start_dir = os.path.dirname(self.filename)
+        for dirpath, __, filenames in os.walk(start_dir, topdown=False):
+            if self.tags_filename in filenames:
+                return os.path.join(dirpath, self.tags_filename)
+
+        raise ValueError('No tags file found in parent folders of given file')
+
+    def log(self, message):
+        self.nvim.out_write(message + "\n")