initial commit with basically working state

Author: jkalbhenn

app/controller/subject_autocomplete_controller.rb

@@ -0,0 +1,76 @@
+# -*- coding: utf-8 -*-
+class SubjectAutocompleteController < ApplicationController
+
+  if Rails::VERSION::MAJOR >= 4
+    before_action :find_project, :init
+  else
+    before_filter :find_project, :init
+  end
+
+  def init
+    @issue_status_closed = IssueStatus.where('is_closed=?', true).pluck :id
+    @issue_status_open = IssueStatus.select('id').where('is_closed=?', false).pluck :id
+  end
+
+  def get_matches
+    # autocomplete for the issue subject field.
+    limit_count = 15
+    default_closed_past_days = 30
+    # load closed tickets, show issue id
+    @issues = []
+    q = params[:term].to_s.strip
+    if q.present?
+      if @project.nil?
+        scope = Issue.visible
+      else
+        if @project.parent
+          project_siblings = Project.where(:parent_id => @project.parent.id).map{|e| e.id }
+          project_siblings_children = Project.where(:parent_id => project_siblings).map{|e| e.id }
+          projects = project_siblings + project_siblings_children << @project.parent[:id]
+        else
+          project_children = Project.where(:parent_id => @project.id).map{|e| e.id }
+          projects = project_children << @project.id
+        end
+        scope = Issue.where(:project_id => projects).visible
+      end
+      if q.match(/\A#?(\d+)\z/)
+        @issues << scope.find_by_id($1.to_i)
+      end
+      past_days = params[:closed_past_days] ? params[:closed_past_days].to_i : default_closed_past_days
+      time_now = DateTime.now
+      # use ruby regexp. not all databases support regexp in sql
+      q = q.gsub(/[^a-zA-Z0-9# ]/, "").split(" ").map{|e|
+        e = Issue.connection.quote("%#{e}%")
+        "lower(#{Issue.table_name}.subject) like #{e}"}.join(" and ")
+      @issues += scope
+        .where("#{q} and " +
+               "(issues.status_id in(?) or (issues.status_id in(?) and issues.updated_on between ? and ?))",
+               @issue_status_open, @issue_status_closed, time_now - past_days, time_now)
+        .order("#{Issue.table_name}.id desc")
+        .limit(limit_count)
+      @issues.compact!
+      versions = {}
+      Version.select("id,name").each{|e| versions[e.id] = e.name }
+    end
+    render :json => @issues.map {|e|
+      label = "##{e[:id]} #{e[:subject]}"
+      if e.fixed_version_id then label = "#{versions[e.fixed_version_id]} » #{label}" end
+      {
+        "label" => label,
+        "value" => "",
+        "issue_url" => url_for(:controller => "issues", :action => "show", :id => e[:id]),
+        "is_closed" => e.closed?
+      }
+    }
+  end
+
+  private
+
+  def find_project
+    if params[:project_id].present?
+      @project = Project.find(params[:project_id])
+    end
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+end

assets/javascripts/main.js

@@ -0,0 +1,27 @@
+function autocompleteSubject() {
+	// offer an autocomplete selection for existing issues in the subject field when creating new issues.
+  var input = $(".new_issue #issue_subject");
+  if (input.length == 0) return;
+  input.attr("placeholder", subjectAutocomplete.translations.placeholder_text)
+  input.autocomplete({
+    source: subjectAutocomplete.get_matches_path,
+    minLength: 2,
+    search: function() {
+      input.addClass("ajax-loading");
+    },
+    response: function() {
+      input.removeClass("ajax-loading");
+    },
+    select: function(event, ui) {
+      window.location.href = ui.item.issue_url;
+    }
+  }).data("ui-autocomplete")._renderItem = function(ul, item) {
+    listItem = $("<li></li>").data("item.autocomplete", item).append("<a>" + item.label + "</a>").appendTo(ul);
+    if (item.is_closed) listItem.css("text-decoration", "line-through");
+    return listItem;
+  };
+}
+
+jQuery(function() {
+  autocompleteSubject();
+});

config/locales/de.yml

@@ -0,0 +1,2 @@
+de:
+  placeholder_text: "Kurzbeschreibung eingeben / Tickets suchen"

config/locales/en.yml

@@ -0,0 +1,2 @@
+en:
+  placeholder_text: "Enter subject / Search existing Issues"

config/routes.rb

@@ -0,0 +1 @@
+get "sbject_autocomplete/:action", controller: "subject_autocomplete"

init.rb

@@ -0,0 +1,10 @@
+require "redmine"
+require_dependency "redmine_subject_autocomplete/hooks"
+
+Redmine::Plugin.register :redmine_subject_autocomplete do
+  name "redmine subject autocomplete"
+  author "intera gmbh"
+  author_url "https://github.com/intera"
+  version "1.0.0"
+  description "makes the issue subject field show an autocomplete that lists existing issues to prevent duplicate ticket creation"
+end

lib/redmine_subject_autocomplete/hooks.rb

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+module RedmineSubjectAutocomplete
+  class Hooks < Redmine::Hook::ViewListener
+    def view_issues_form_details_bottom(context)
+
+      path = (config.relative_url_root || '') + url_for({controller: 'subject_autocomplete', action: 'get_matches'}) + "?project_id=#{context[:project][:id]}"
+      translations = {
+        "placeholder_text" => I18n.translate(:placeholder_text)
+      }
+      javascript_tag("var subjectAutocomplete = {get_matches_path: \"#{escape_javascript path}\", translations: #{translations.to_json}}") +
+        javascript_include_tag('main', :plugin => 'redmine_subject_autocomplete')
+    end
+  end
+end

other/subject_autocomplete.png

@@ -0,0 +1,8 @@
+# redmine subject autocomplete
+
+makes the new issue subject field show an autocomplete that lists existing issues to prevent duplicate ticket creation.
+when one of the listed issues is selected, navigation changes to the selected issue.
+
+compatible with redmine 4 and 3.
+
+![screenshot-1](other/subject_autocomplete.png?raw=true)