From 850d81e4eb126526cbe179c459355e261eda0770 Mon Sep 17 00:00:00 2001
From: Eddy Ernesto del Valle Pino <xigmatron@gmail.com>
Date: Tue, 14 Nov 2017 23:35:14 +0100
Subject: [PATCH] Add autocompletion of function parameters.

---
 .gitignore                   |  1 +
 Default.sublime-keymap       |  9 ++++
 super_elixir/autocomplete.py | 93 ++++++++++++++++++++++++++++++++++--
 3 files changed, 100 insertions(+), 3 deletions(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..98d4bff
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+package-metadata.json
diff --git a/Default.sublime-keymap b/Default.sublime-keymap
index 5247173..5930f96 100644
--- a/Default.sublime-keymap
+++ b/Default.sublime-keymap
@@ -14,4 +14,13 @@
         ]
     },
 
+    {"command": "super_elixir_params_autocomplete",
+        "keys": ["("],
+        "context": [
+           {"key": "selector", "operator": "equal", "operand":  "source.elixir - string - comment"},
+           {"key": "selection_empty", "operator": "equal", "operand": true, "match_all": true},
+           {"key": "following_text", "operator": "regex_match", "operand": "^($| )", "match_all": true}
+        ]
+    },
+
 ]
diff --git a/super_elixir/autocomplete.py b/super_elixir/autocomplete.py
index b6d685f..d378efb 100644
--- a/super_elixir/autocomplete.py
+++ b/super_elixir/autocomplete.py
@@ -7,12 +7,17 @@
 from .sense_client import get_elixir_sense
 
 
+FOLLOWING_CHARS = set(["\r", "\n", "\t", " ", ")", "]", ";", "}", "\x00"])
+
+
 class Autocomplete(sublime_plugin.EventListener):
 
     def on_query_completions(self, view, prefix, locations):
         if not is_elixir(view):
             return
 
+        print(prefix, locations)
+
         buffer, line, column = get_buffer_line_column(view, locations[0])
 
         sense = get_elixir_sense(view)
@@ -65,9 +70,9 @@ def on_query_completions(self, view, prefix, locations):
 
     def _sort_by_frequency_in_view(self, buffer, completions):
         completions.sort(key=lambda c: (
-            -buffer.count(c['name']),
-            len(c['name']) - len(c['name'].strip('_')),
-            c['name'],
+            -buffer.count(c['name']),  # how many times it is in the buffer
+            len(c['name']) - len(c['name'].strip('_')),  # less underscores wins
+            c['name'],  # alphabetically
         ))
         return completions
 
@@ -94,3 +99,85 @@ def on_hover(self, view, point, hover_zone):
                 location=point,
                 max_width=1024,
             )
+
+
+class SuperElixirParamsAutocomplete(sublime_plugin.TextCommand):
+
+    def run(self, edit, characters='('):
+
+        point = self.view.sel()[0].a
+        f_name = self.view.substr(self.view.word(point))
+        completions = Autocomplete().on_query_completions(
+            self.view, f_name, [point])
+
+        if completions:
+            show, snippet = completions[0]
+            snippet = snippet[snippet.index('('):]  # cut out the function name
+            self.view.run_command('insert_snippet', {"contents": snippet})
+        else:
+            self._insert_characters(edit, characters, ')')
+
+    @property
+    def auto_match_enabled(self):
+        """ check if sublime closes parenthesis automaticly """
+        return self.view.settings().get('auto_match_enabled', True)
+
+    def _insert_characters(self, edit, open_pair, close_pair):
+        """
+        Insert autocomplete character with closed pair
+        and update selection regions
+
+        If sublime option `auto_match_enabled` turned on, next behavior have to
+        be:
+
+            when none selection
+
+            `( => (<caret>)`
+            `<caret>1 => ( => (<caret>1`
+
+            when text selected
+
+            `text => (text<caret>)`
+
+        In other case:
+
+            when none selection
+
+            `( => (<caret>`
+
+            when text selected
+
+            `text => (<caret>`
+
+
+        :param edit: sublime.Edit
+        :param characters: str
+        """
+        regions = [a for a in self.view.sel()]
+        self.view.sel().clear()
+
+        for region in reversed(regions):
+            next_char = self.view.substr(region.begin())
+            # replace null byte to prevent error
+            next_char = next_char.replace('\x00', '\n')
+            print("Next characters: {0}".format(next_char))
+
+            following_text = next_char not in FOLLOWING_CHARS
+            print("Following text: {0}".format(following_text))
+
+            if self.auto_match_enabled:
+                self.view.insert(edit, region.begin(), open_pair)
+                position = region.end() + 1
+
+                # IF selection is non-zero
+                # OR after cursor no any text and selection size is zero
+                # THEN insert closing pair
+                if (region.size() > 0 or
+                        not following_text and region.size() == 0):
+                    self.view.insert(edit, region.end() + 1, close_pair)
+                    position += (len(open_pair) - 1)
+            else:
+                self.view.replace(edit, region, open_pair)
+                position = region.begin() + len(open_pair)
+
+            self.view.sel().add(sublime.Region(position, position))