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update contributing doc
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deadc0de6
185
CONTRIBUTING.md
185
CONTRIBUTING.md
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Content
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* [code base](#code-base)
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* [config parsing](#config-parsing)
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* [lower layer](#lower-layer)
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* [higher layer](#higher-layer)
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* [Precedence](#precedence)
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* [variables resolution](#variables-resolution)
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* [rules](#rules)
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* [testing](#testing)
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* [testing with unittest](#testing-with-unittest)
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* [testing with bash scripts](#testing-with-bash-scripts)
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* [documentation](#documentation)
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Thanks for helping out!
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Feature requests, bug reports and PRs are always welcome!
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@@ -6,9 +20,9 @@ This file provides a few pointers on how to contribute to dotdrop
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and where to find information. For any question, feel free to open an issue.
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For PR adding new features, I'd be very thankful if you could add either
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a unittest testing the added feature or a bash script test, thanks!
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a unittest testing the added feature or a bash script test ((see [testing](#testing), thanks!
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# Code base
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# code base
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Dotdrop's code base is located in the [dotdrop directory](/dotdrop).
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@@ -32,25 +46,100 @@ Here's an overview of the different files and their role:
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* **updater.py**: the class handling the update of dotfiles for `update`
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* **utils.py**: some useful methods
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## Config parsing
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# config parsing
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The configuration file (yaml) is parsed in two layers:
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The configuration file (yaml) is parsed using two layers:
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* the lower layer in `cfg_yaml.py`
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* the higher layer in `cfg_aggregator.py`
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* first in the lower layer in [cfg_yaml.py](/dotdrop/cfg_yaml.py)
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* then in the higher layer in [cfg_aggregator.py](/dotdrop/cfg_aggregator.py)
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Only the higher layer is accessible to other classes of dotdrop.
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**Rules**
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## lower layer
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This is done in [cfg_yaml.py](/dotdrop/cfg_yaml.py)
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The lower layer part is only taking care of basic types
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and does the following:
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* normalize all config entries
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* resolve paths (dotfiles src, dotpath, etc)
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* refactor actions/transformations to a common format
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* etc
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* import any data from external files (configs, variables, etc)
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* apply variable substitutions
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* complete any data if needed (add the "profile" variable, etc)
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* execute intrepreted variables through the shell
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* write new entries (dotfile, profile) into the dictionary and save it to a file
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* fix any deprecated entries (link_by_default, etc)
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* clear empty entries
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In the end it builds a cleaned and normalized dictionary to be accessed by the higher layer.
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## higher layer
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This is done in [cfg_aggregator.py](/dotdrop/cfg_aggregator.py)
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The higher layer will transform the dictionary parsed by the lower layer
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into objects (profiles, dotfiles, actions, transformations, etc).
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The higher layer has no notion of inclusion (profile included for example) or
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file importing (import actions, etc) or even interpreted variables
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(it only sees variables that have already been interpreted).
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It does the following:
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* transform dictionaries into objects
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* patch list of keys with its corresponding object (for example dotfile's actions)
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* provide getters for every other classes of dotdrop needing to access elements
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Note that any change to the yaml dictionary (adding a new profile or a new dotfile for
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example) won't be *seen* by the higher layer until the config is reloaded. Consider the
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`dirty` flag as a sign the file needs to be written and its representation in higher
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levels in not accurate anymore.
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## precedence
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* `dynvariables` > `variables`
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* profile `(dyn)variables` > any other `(dyn)variables`
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* profile `(dyn)variables` > profile's included `(dyn)variables`
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* imported `variables`/`dynvariables` > `(dyn)variables`
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## variables resolution
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How variables are resolved (through jinja2's
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templating) in the config file.
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* resolve main config file variables
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* merge `variables` and `dynvariables` (allowing cycling reference)
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* recursively template merged `variables` and `dynvariables`
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* `dynvariables` are executed
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* profile's `variables` and `dynvariables` are merged
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* resolve *included* entries (see below)
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* paths and entries are templated
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(allows to use something like `include {{@@ os @@}}.variables.yaml`)
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* *included* entries are processed
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* dyn-/variables are all resolved in their own file
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potential *included* entries
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* entry *import_actions*
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* entry *import_configs*
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* entry *import_variables*
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* profile's *import*
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* profile's *include
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Variables are then used to resolve different elements in the config file:
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see [this](https://github.com/deadc0de6/dotdrop/wiki/config-variables#config-available-variables)
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## rules
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* `dynvariables` are executed in their own config file
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* since `variables` and `dynvariables` are templated before the `dynvariables`
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are executed, this means that `dynvariables` can safely reference `variables` however
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`variables` referencing `dynvariables` will result with the none executed value of the
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`variables` referencing `dynvariables` will result with the *not-executed* value of the
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referenced `dynvariables` (see examples below)
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* profile cannot include profiles defined above in the import tree
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* config files do not have access to variables
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defined above in the import tree
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* config files do not have access to variables defined above in the import tree
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* actions/transformations using variables are resolved at runtime
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(when action/transformation is executed) and not when loading the config
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This will result with `dvar0 = "test"` and `var0 = "echo test"` (**not** `var0 = test`)
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```yaml
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@@ -68,80 +157,8 @@ dynvariables:
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dvar0: "echo {{@@ var0 @@}}"
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```
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**Precedence**
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* `dynvariables` > `variables`
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* profile `(dyn)variables` > any other `(dyn)variables`
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* profile `(dyn)variables` > profile's included `(dyn)variables`
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* imported `variables`/`dynvariables` > `(dyn)variables`
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* actions/transformations using variables are resolved at runtime
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(when action/transformation is executed) and not when loading the config
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## lower layer (cfg_yaml.py)
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The lower layer part is only taking care of basic types
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does the following:
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* normalize all config entries
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* resolve paths (dotfiles src, dotpath, etc)
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* refactor actions to a common format
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* etc
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* import any data from external files (configs, variables, etc)
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* apply variable substitutions
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* complete any data if needed (add the "profile" variable, etc)
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* execute intrepreted variables through the shell
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* write new entries (dotfile, profile) into the dictionary and save it to a file
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* fix any deprecated entries (link_by_default, etc)
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* clear empty entries
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In the end it makes sure the dictionary accessed
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by the higher layer is clean and normalized.
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## higher layer (cfg_aggregator.py)
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The higher layer will transform the dictionary parsed by the lower layer
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into objects (profiles, dotfiles, actions, etc).
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The higher layer has no notion of inclusion (profile included for example) or
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file importing (import actions, etc) or even interpreted variables
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(it only sees variables that have already been interpreted).
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It does the following:
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* transform dictionaries into objects
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* patch list of keys with its corresponding object (for example dotfile's actions)
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* provide getters for every other classes of dotdrop needing to access elements
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Note that any change to the yaml dictionary (adding a new profile or a new dotfile for
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example) won't be *seen* by the higher layer until the config is reloaded. Consider the
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`dirty` flag as a sign the file needs to be written and its representation in higher
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levels in not accurate anymore.
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## Variables resolution in the config file
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How variables are resolved (through jinja2's
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templating) in the config file.
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* resolve main config file variables
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* merge `variables` and `dynvariables` (allowing cycling reference)
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* recursively template merged `variables` and `dynvariables`
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* `dynvariables` are executed
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* profile's `variables` and `dynvariables` are merged
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* resolve *included* entries (see below)
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* paths and entries are templated
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(allows to use something like `include {{@@ os @@}}.variables.yaml`)
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* *included* entries are processed
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* dyn-/variables are all resolved in their own file
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*included*
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* entry *import_actions*
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* entry *import_configs*
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* entry *import_variables*
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* profile's *import*
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* profile's *include
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Variables are then used to resolve different elements in the config file:
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see [this](https://github.com/deadc0de6/dotdrop/wiki/config-variables#config-available-variables)
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# Testing
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# testing
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Dotdrop is tested with the use of the [tests.sh](/tests.sh) script.
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@@ -166,6 +183,6 @@ for different use-cases (usually described in their filename).
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Each script starts with the same boiler plate code that you can paste at the
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start of your new test (see the head of the file down to `# this is the test`).
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# Documentation
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# documentation
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Most of dotdrop documentation is hosted in [its wiki](https://github.com/deadc0de6/dotdrop/wiki)
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