Useful Tips¶
One of these tips appears on startup, by default.
You can disable these tips by setting @bool show-tips = False.
The most important tips¶
You don’t have to remember command names¶
To execute a command, type Alt-X, followed by the first few characters of the command name, followed by Tab. The list of commands matching what you have typed appears. For more details, see the commands tutorial.
Learn to use clones¶
Clones are “live” copies of the node itself and all its descendants. See the clones tutorial for more details.
Learning to use Leo¶
Leo’s most important plugins¶
Become familiar with Leo’s most important plugins:
bookmarks.py manages bookmarks.
contextmenu.py shows a menu when right-clicking.
mod_scripting.py supports @button and @command nodes.
quicksearch.py adds a Nav tab for searching.
todo.py handles to-do lists and is a project manager.
viewrendered.py renders content in the rendering pane.
Move clones to the last top-level node¶
Focus your attention on the task at hand by cloning nodes, including @file nodes, then moving those clones so they are the last top-level nodes in the outline. This organization allows you to work on nodes scattered throughout an outline without altering the structure of @file nodes.
Put personal settings myLeoSettings.leo¶
Put your personal settings in myLeoSettings.leo, not leoSettings.leo.
The leo-settings command opens leoSettings.leo.
The my-leo-settings command opens myLeoSettings.leo.
Copy the desired settings nodes from leoSettings.leo to myLeoSettings.leo.
Search for settings in leoSettings.leo¶
leoSettings.leo contains the defaults for all of Leo’s settings, with documentation for each.
Use abbreviations¶
Leo’s abbreviations can correct spelling mistakes, expand to multiple lines or even trees of nodes. Abbreviations can execute scripts and can prompt for values to be substituted within the abbreviation. See the abbreviations tutorial for more details.
Useful commands and actions¶
The beautify command & @nobeautify directive¶
The @nobeautify directive suppresses beautification of the node in which it appears.
The find-quick-selected command¶
The find-quick-selected (Ctrl-Shift-F) command finds all nodes containing the selected text.
The parse-body command¶
The parse-body command parses p.b (the body text of the selected node) into separate nodes.
The pyflakes command¶
pyflakes is a superb programming tool. It checks python files almost instantly.
These settings cause Leo to run pyflakes whenever saving a .py file and to raise a dialog if pyflakes finds any errors:
@bool run-pyflakes-on-write = True
@bool syntax-error-popup = True
The pylint command¶
Leo’s pylint command runs pylint on all @<file> nodes in the selected trees.
Pylint runs in the background, so you can continue to use Leo while pylint runs.
The rst3 command¶
The rst3 command converts an @rst tree to a document file.
The sort-siblings command¶
The sort-siblings (Alt-A) command sorts all the child nodes of their parent, or all top-level nodes.
Use Alt-N (goto-next-clone) to find “primary” clones¶
Use Alt-N to cycle through the clones of the present cloned node. This command is a fast way of finding the clone whose ancestor is an @<file> node.
Use cffm to gather outline nodes¶
The cff command (aka clone-find-flattened-marked) clones all marked nodes as children of a new node, created as the last top-level node. Use this to gather nodes throughout an outline.
Use Ctrl-P (repeat-complex-command) to avoid key bindings¶
Ctrl-P re-executes the last command made from the minibuffer. You can use this to avoid having to define key bindings.
For example, instead of pressing an @button button, execute its command from the minibuffer. Now you can re-execute the button using Ctrl-P.
Scripting tips¶
Clearing the Log window¶
When developing scripts that use the Log window to display results, it is sometimes useful to clear the Log window by inserting the following two lines at the beginning of your script:
c.frame.log.selectTab('Log')
c.frame.log.clearLog()
g.callers() returns a list of callers¶
g.callers() returns the last n callers (default 4) callers of a function or method. The verbose option shows each caller on a separate line. For example:
g.trace(g.callers())
You must launch Leo from a console window.
Use a universal shortcut for your scripts¶
You can have a personal shortcut to run a script while developing it. For
example: put @key=Alt-4 in the headline. If your script grows to several
subnodes, you won’t have to select the top node every time you wish to run
the script. Just press your universal shortcut.
Use cff to gather nodes matching a pattern¶
The cff command (aka clone-find-flattened) prompts for a search pattern, then clones all matching nodes so they are the children of a new last top-level node. This command is a great way to study code.
Use g.pdb from the console¶
g.pdb launches Python’s pdb debugger, adapted for Leo. You must launch Leo from a console window to use the pdb debugger.
Use g.trace to debug scripts¶
The g.trace function prints all its arguments to the console. g.trace shows patterns in running code. You must launch Leo from a console window to see the output of g.trace.
Use section references sparingly¶
Use section references only when the exact position of a section within a file matters.
Here is a common pattern for @file nodes for python files:
"""A docstring"""
<< imports >>
@others
if __name__ == '__main__':
main()
@language python
@tabwidth -4
Use g.handleUnl to select nodes¶
Leo’s status area shows the path from the root node to the selected node. We call such paths UNLs (Uniform Node Locators). Given a UNL, g.handleUnl(unl, c) will select the referenced node. For example:
g.handleUnl('LeoDocs.leo#Use g.handleUnl to select nodes', c)
will select this node in LeoDocs.leo.
