rewrite ansible tasks using YAML syntax

playbooks/roles/local_dev/tasks/main.yml

 ---
-- name: install useful system packages
+- name: Install useful system packages
   apt:
-    pkg={{','.join(local_dev_pkgs)}} install_recommends=yes
-    state=present update_cache=yes
+    name: "{{ item }}"
+    install_recommends: yes
+    state: present
+    update_cache: yes
+  with_items: "{{ local_dev_pkgs }}"
 
-- name: set login shell for app accounts
-  user: name={{ item.user }} shell="/bin/bash"
-  with_items: localdev_accounts
+- name: Set login shell for app accounts
+  user:
+    name: "{{ item.user }}"
+    shell: "/bin/bash"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
 
 # The user that runs the app needs read/write permissions
 # to the directories under var to be able to import and create
 # new courses.
-- name: update permissions for edxapp data dir
+- name: Update permissions for edxapp data dir
   file:
     path: "{{ edxapp_data_dir }}"
     state: "directory"
@@ -22,85 +27,98 @@
   when: edxapp_user is defined
 
 # Create scripts to configure environment
-- name: create login scripts
+- name: Create login scripts
   template:
-    src=app_bashrc.j2 dest={{ item.home }}/.bashrc
-    owner={{ item.user }} mode=755
-  with_items: localdev_accounts
+    src: app_bashrc.j2
+    dest: "{{ item.home }}/.bashrc"
+    owner: "{{ item.user }}"
+    mode: "0755"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
   ignore_errors: yes
 
 # Default to the correct git config
 # No more accidentally force pushing to master! :)
-- name: configure git
+- name: Configure git
   copy:
-    src=gitconfig dest={{ item.home }}/.gitconfig
-    owner={{ item.user }} mode=700
-  with_items: localdev_accounts
+    src: gitconfig
+    dest: "{{ item.home }}/.gitconfig"
+    owner: "{{ item.user }}"
+    mode: "0700"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
   ignore_errors: yes
 
 # Configure X11 for application users
-- name: preserve DISPLAY for sudo
+- name: Preserve DISPLAY for sudo
   copy:
-    src=x11_display dest=/etc/sudoers.d/x11_display
-    owner=root group=root mode=0440
+    src: x11_display
+    dest: /etc/sudoers.d/x11_display
+    owner: root
+    group: root
+    mode: "0440"
 
-- name: login share X11 auth to app users
+- name: Login share X11 auth to app users
   template:
-    src=share_x11.j2 dest={{ localdev_home }}/share_x11
-    owner={{ localdev_user }} mode=0700
+    src: share_x11.j2
+    dest: "{{ localdev_home }}/share_x11"
+    owner: "{{ localdev_user }}"
+    mode: "0700"
 
-- name: update bashrc with X11 share script
+- name: Update bashrc with X11 share script
   lineinfile:
-    dest={{ localdev_home }}/.bashrc
-    regexp=". {{ localdev_home }}/share_x11"
-    line=". {{ localdev_home }}/share_x11"
-    state=present
+    dest: "{{ localdev_home }}/.bashrc"
+    regexp: ". {{ localdev_home }}/share_x11"
+    line: ". {{ localdev_home }}/share_x11"
+    state: present
 
 # Create scripts to add paver autocomplete
-- name: add paver autocomplete
+- name: Add paver autocomplete
   copy:
     src: paver_autocomplete
     dest: "{{ item.home }}/.paver_autocomplete"
     owner: "{{ item.user }}"
     group: "{{ common_web_group }}"
-    mode: 0755
-  with_items: localdev_accounts
+    mode: "0755"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
   ignore_errors: yes
 
 # Add useful vimrc files 
-- name: create .vim/plugin directory
+- name: Create .vim/plugin directory
   file:
     path: "{{ item.home }}/.vim/ftplugin"
     owner: "{{ item.user }}"
     group: "{{ common_web_group }}"
     state: directory
-  with_items: localdev_accounts
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
 
-- name: add .vimrc file
+- name: Add .vimrc file
   copy:
     src: vimrc
     dest: "{{ item.home }}/.vimrc"
     owner: "{{ item.user }}"
     group: "{{ common_web_group }}"
-    mode: 0644
-  with_items: localdev_accounts
+    mode: "0644"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
 
-- name: add python.vim ftplugin file
+- name: Add python.vim ftplugin file
   copy:
     src: ftplugin-python.vim
     dest: "{{ item.home }}/.vim/ftplugin/python.vim"
     owner: "{{ item.user }}"
     group: "{{ common_web_group }}"
-    mode: 0644
-  with_items: localdev_accounts
+    mode: "0644"
+  with_items: "{{ localdev_accounts }}"
   when: item.user != 'None'
 
 # Edit the /etc/hosts file so that the Preview button will work in Studio
-- name: add preview.localhost to /etc/hosts
-  shell: sed -i -r 's/^127.0.0.1\s+.*$/127.0.0.1 localhost preview.localhost/' /etc/hosts
+- name: Add preview.localhost to /etc/hosts
+  lineinfile:
+    dest: /etc/hosts
+    regexp: "^127.0.0.1"
+    line: "127.0.0.1 localhost preview.localhost"
+    state: present
   become: yes