[gnome-builder] vala: add parameters and generic types to method completions

[Christian Hergert <chergert src gnome org>]

commit ced8c191193310ac8c80040518ec78a98b03b273
Author: Christian Hergert <christian hergert me>
Date:   Sat Sep 26 23:32:31 2015 -0700

    vala: add parameters and generic types to method completions

 plugins/vala-pack/ide-vala-completion-item.vala |   62 ++++++++++++++++++++++-
 1 files changed, 60 insertions(+), 2 deletions(-)
---
diff --git a/plugins/vala-pack/ide-vala-completion-item.vala b/plugins/vala-pack/ide-vala-completion-item.vala
index 94ee00b..95f3358 100644
--- a/plugins/vala-pack/ide-vala-completion-item.vala
+++ b/plugins/vala-pack/ide-vala-completion-item.vala
@@ -30,6 +30,7 @@ namespace Ide
 
                Vala.Symbol symbol;
                ValaCompletionMarkupFunc? markup_func;
+               string label;
 
                static construct {
                        hash_seed = "IdeValaCompletionItem".hash ();
@@ -38,6 +39,12 @@ namespace Ide
                public ValaCompletionItem (Vala.Symbol symbol)
                {
                        this.symbol = symbol;
+
+                       /* Unfortunate we have to do this here, because it would
+                        * be better to do this lazy. But that would require access to
+                        * the code context while it could be getting mutated.
+                        */
+                       this.build_label ();
                }
 
                public void set_markup_func (owned ValaCompletionMarkupFunc? func)
@@ -85,10 +92,61 @@ namespace Ide
                        return this.symbol.name;
                }
 
+               public void build_label ()
+               {
+                       GLib.StringBuilder str = new GLib.StringBuilder ();
+
+                       if (this.symbol is Vala.Method) {
+                               var method = symbol as Vala.Method;
+                               str.append (method.return_type.to_qualified_string (symbol.owner));
+                               str.append_printf (" %s", method.name);
+                               var type_params = method.get_type_parameters ();
+                               if (type_params.size > 0) {
+                                       str.append ("&lt;");
+                                       foreach (var type_param in type_params) {
+                                               str.append (type_param.name);
+                                               str.append_c (',');
+                                       }
+                                       str.truncate (str.len - 1);
+                                       str.append ("&gt;");
+                               }
+                               str.append (" (");
+                               var parameters = method.get_parameters ();
+                               foreach (var param in parameters) {
+                                       if (param.ellipsis) {
+                                               str.append ("..., ");
+                                               break;
+                                       }
+
+                                       if (param.direction == ParameterDirection.OUT)
+                                               str.append ("out ");
+                                       else if (param.direction == ParameterDirection.REF)
+                                               str.append ("ref ");
+
+                                       if (param.variable_type is Vala.DelegateType)
+                                               str.append_printf ("%s, ", (param.variable_type as 
Vala.DelegateType).delegate_symbol.name);
+                                       else if (param.variable_type is Vala.DataType)
+                                               str.append_printf ("%s, ", (param.variable_type as 
Vala.DataType).to_qualified_string (method.owner));
+                                       else if (param.variable_type is Vala.ValueType)
+                                               str.append_printf ("%s, ", (param.variable_type as 
Vala.ValueType).type_symbol.name);
+                                       else
+                                               str.append_printf ("%s, ", param.variable_type.type_name);
+                               }
+                               if (parameters.size > 0) {
+                                       str.truncate (str.len - 2);
+                               }
+                               str.append_c (')');
+                       } else {
+                               str.append (this.symbol.name);
+                       }
+
+                       this.label = str.str;
+               }
+
                public string get_markup () {
                        if (this.markup_func != null)
-                               return this.markup_func (this.symbol.name);
-                       return this.symbol.name;
+                               return this.markup_func (this.label);
+                       return this.label;
                }
 
                public string get_text () {