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Added a section about meta-commands to developer documentation.
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DEVELOP.rst
34
DEVELOP.rst
@ -38,9 +38,14 @@ It is highly recommended to use virtualenv for development. If you don't know
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what a virtualenv is, this `guide <http://docs.python-guide.org/en/latest/dev/virtualenvs/#virtual-environments>`_
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will help you get started.
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Create a virtualenv (let's call it pgcli-dev). Once the virtualenv is activated
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`cd` into the local clone of pgcli folder and install pgcli using pip as
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follows:
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Create a virtualenv (let's call it pgcli-dev). Activate it:
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::
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source ./pgcli-dev/bin/activate
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Once the virtualenv is activated, `cd` into the local clone of pgcli folder
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and install pgcli using pip as follows:
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::
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@ -56,3 +61,26 @@ we've linked the pgcli installation with the working copy. So any changes made
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to the code is immediately available in the installed version of pgcli. This
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makes it easy to change something in the code, launch pgcli and check the
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effects of your change.
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Adding PostgreSQL Special (Meta) Commands
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-----------------------------------------
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If you want to work on adding new meta-commands (such as `\dp`, `\ds`, `dy`),
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you'll be changing the code of `packages/pgspecial.py`. Search for the
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dictionary called `CASE_SENSITIVE_COMMANDS`. The special command us used as
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the dictionary key, and the value is a tuple.
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The first item in the tuple is either a string (sql statement) or a function.
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The second item in the tuple is a list of strings which is the documentation
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for that special command. The list will have two items, the first item is the
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command itself with possible options and the second item is the plain english
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description of that command.
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For example, `\l` is a meta-command that lists all the databases. The way you
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can see the SQL statement issued by PostgreSQL when this command is executed
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is to launch `psql -E` and entering `\l`.
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That will print the results and also print the sql statement that was executed
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to produce that result. In most cases it's a single sql statement, but sometimes
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it's a series of sql statements that feed the results to each other to get to
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the final result.
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TODO
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TODO
@ -6,7 +6,7 @@
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* [ ] Refactor to sqlcompletion to consume the text from left to right and use a state machine to suggest cols or tables instead of relying on hacks.
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* [ ] Add a few more special commands. (\l pattern, \dp, \ds, \dy, \z etc)
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* [ ] Refactor pgspecial.py to a class.
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* [ ] Write a doc about how to add new pgspecial commands.(psql -E)
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* [X] Write a doc about how to add new pgspecial commands.(psql -E)
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* [ ] Show/hide docs for a statement using a keybinding.
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* [ ] Check how to add the name of the table before printing the table.
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* [ ] Add a new trigger for M-/ that does naive completion.
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