Detailed Doc

Author: PrajwalM2212

Users/toml_config.rst

@@ -7,14 +7,14 @@ coala in TOML format.
 Naming, Scope and Location
 --------------------------
 
-You can use up to three coafiles to configure your project.
+You can use up to three configuration files to configure your project.
 
-1. A project-wide coafile.
-2. A user-wide coafile.
-3. A system-wide coafile.
+1. A project-wide configuration file.
+2. A user-wide configuration file.
+3. A system-wide configuration file.
 
-Project-Wide coafile
-~~~~~~~~~~~~~~~~~~~~
+Project-Wide configuration file
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 It is a convention that the project-wide configuration file is named
 ``.coafile.toml`` and lies in the project root directory.
@@ -25,8 +25,8 @@ Settings given in the project-wide configuration file override all settings
 given by other files and can only be overridden by settings given via the
 command line interface.
 
-User-Wide and System-Wide coafile
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+User-Wide and System-Wide configuration file
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 You can place a ``.coarc.toml`` file in your home directory to set certain
 user wide settings. Those settings will automatically be taken for all
@@ -43,9 +43,9 @@ like minified files (e.g. ``*.min.js``) and backup files (e.g. ``*.orig``)::
     ignore = [ '**.min.js', '**.orig' ]
 
 Basic TOML concepts
----------------------------------
+~~~~~~~~~~~~~~~~~~~~
 This part describes the basic TOML concepts required to write coala
-configuration files
+configuration files in TOML
 
 - TOML is case sensitive. So remember to not have duplicate sections/tables
   or duplicate keys in same section.
@@ -54,7 +54,7 @@ configuration files
 - A table is a collection of key-value pairs. Use a table for specifying
   a coala section.
 
-::
+This is an example of a coala configuration file written in TOML ::
 
     [cli]
     bears = 'SpaceConsistencyBear'
@@ -67,47 +67,45 @@ configuration files
     ignore = 'venv/**'
     bears = 'InvalidLinkBear'
 
+
 Here tables ``cli`` and ``invalidlinks`` are coala sections.
 The contents of the tables like ``bears``, ``files`` are rules
-that govern a section. In coala you will be using TOML strings,
-booleans, integers and arrays as values.
+that govern a section. To write coala configuration file you will
+be using TOML strings, booleans, integers and arrays as values.
 
 Section Inheritance
-----------------------------
+~~~~~~~~~~~~~~~~~~~~
 coala supports section inheritance. You can define section inheritance
-explicitly by naming a section in the format ``["basesection.newsection"]``.
+by using the key ``inherits``.
 Extra values can be appended to an inherited setting using the ``appends`` key.
 
-.. note::
-
-    In ``["basesection.newsection"]``, the quotes insides the square braces are
-    necessary for specifying section inheritance in TOML.
-
-
-Consider the following coafile::
+Consider the following configuration file in TOML ::
 
   [all]
   enabled = true
   overridable = 2
   ignore = 'vendor1/'
 
-  ["all.section1"]
+  [section1]
   overridable = 3
+  inherits = 'all'
   appends = 'ignore'
   ignore = 'vendor2/'
   other = 'some_value'
 
-  ["all.section2"]
+  [section2]
   overridable = 4
+  inherits = 'all'
   ignore = 'vendor3/'
   appends = 'ignore'
   other = 'some_other_value'
 
 
 In the inherited sections above, ``appends`` key specifies that the value of
 ``ignore`` in the derived sections must be appended with the value of
-``ignore`` key in the base section. This is the same file without section
-inheritance::
+``ignore`` key in the base section.
+
+This is the same file without section inheritance::
 
   [all]
   enabled = true
@@ -127,8 +125,52 @@ inheritance::
   other = 'some_other_value'
 
 
+Consider another example
+
+Config file in TOML
+
+::
+
+ [all]
+ a = 1
+ b = 2
+
+ [java]
+ c = 3
+ d = 4
+
+ [python]
+ p = 5
+ q = 6
+ inherits = [ 'all', 'java']
+
+You can use this syntax to specify multiple inheritance
+The same is coafile appears as
+
+::
+
+ [all]
+ a = 1
+ b = 2
+
+ [java]
+ c = 3
+ d = 4
+
+ [all.python]
+ a = 1
+ b = 2
+ p = 5
+ q = 6
+
+ [java.python]
+ c = 3
+ d = 4
+ p = 5
+ q = 6
+
 Defining Aspects and Tastes
----------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Aspects is an alternative way to configure coala. In this mode, we don't need
 to explicitly state list of bears, coala will choose it automatically based on
@@ -153,3 +195,92 @@ See the following example::
   # excluding certain subaspect
   excludes = 'AspectName2Subaspect'
 
+
+For existing coala users
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In this section we will see how to convert a complex coafile into
+a configuration file in TOML
+
+coafile ::
+
+ [all]
+ files = *.py, coantlib/**/*.py, tests/**/*.py, coantbears/**/*.py, .ci/*.py
+ max_line_length = 80
+ use_spaces = True
+
+ [all.python]
+ # Patches may conflict with autopep8 so putting them in own section so they
+ # will be executed sequentially; also we need the LineLengthBear to double
+ # check the line length because PEP8Bear sometimes isn't able to correct the
+ # linelength.
+ bears = SpaceConsistencyBear
+ language = Python
+ preferred_quotation = '
+
+ default_actions = **: ApplyPatchAction
+
+ [all.flakes]
+ # Do not set default_action to ApplyPatchAction as it may lead to some
+ # required imports being removed that might result in coala behaving weirdly.
+
+ default_actions = *: ShowPatchAction
+
+ bears += PyUnusedCodeBear
+ language = Python
+ remove_all_unused_imports = true
+
+To convert a coafile to configuration file in TOML
+
+- Enclose all string values in quotes
+- Use array notation to depict list of strings
+- Replace ``[parent_section.inherited_section]]`` with ``[inherited.section]``
+  and add ``inherits = parent_section`` as a key-value pair
+- Use ``true`` or ``false`` to specify booleans
+- Replace ``a += b`` with
+  ::
+
+   a = 'b'
+   appends = 'a'
+
+- If you are using aspects  ``a:b = 'c'``  in a section named `example`
+  then replace
+  ``a:b = 'c'`` with ``a.b = 'c'`` or
+  ::
+
+   [example.a]
+   b = 'c'
+
+Using the above rules we get a configuration file in TOML
+
+::
+
+ [all]
+ files = ['*.py', 'coantlib/**/*.py', 'tests/**/*.py', 'coantbears/**/*.py',
+         '.ci/*.py']
+ max_line_length = 80
+ use_spaces = true
+
+ [python]
+ # Patches may conflict with autopep8 so putting them in own section so they
+ # will be executed sequentially; also we need the LineLengthBear to double
+ # check the line length because PEP8Bear sometimes isn't able to correct the
+ # linelength.
+ inherits = 'all'
+ bears = 'SpaceConsistencyBear'
+ language = 'Python'
+ preferred_quotation = '
+
+ default_actions = '**: ApplyPatchAction'
+
+ [flakes]
+ # Do not set default_action to ApplyPatchAction as it may lead to some
+ # required imports being removed that might result in coala behaving weirdly.
+ inherits = 'all'
+ default_actions = '*: ShowPatchAction'
+
+ bears = 'PyUnusedCodeBear'
+ appends = 'bears'
+ language = 'Python'
+ remove_all_unused_imports = true
+