lsp: Show docs on hover

Also:
- Install the script to <prefix>/bin
- Fix a bug in XmlReader that would cause "uninteresting" tags to not be
  fully ignored
- Other minor improvements

gtkblueprinttool/lsp_utils.py

@@ -20,22 +20,17 @@
 
 from enum import Enum
 
+from . import tokenizer, parser
+from .errors import *
 from .utils import *
 
 
-class TextDocumentSyncKind(Enum):
-    None_ = 0,
-    Full = 1,
-    Incremental = 2,
-
-
 class OpenFile:
     def __init__(self, uri, text, version):
         self.uri = uri
         self.text = text
         self.version = version
 
-        self.diagnostics = []
         self._update()
 
     def apply_changes(self, changes):
@@ -50,8 +45,8 @@ class OpenFile:
         try:
             self.tokens = tokenizer.tokenize(self.text)
             self.ast = parser.parse(self.tokens)
-            self.diagnostics = [self._create_diagnostic(text, err) for err in list(ast.errors)]
+            self.diagnostics += self.ast.errors
         except MultipleErrors as e:
-            self.diagnostics += [self._create_diagnostic(text, err) for err in e.errors]
+            self.diagnostics += e.errors
         except CompileError as e:
-            self.diagnostics += [self._create_diagnostic(text, e)]
+            self.diagnostics += e