Prior to now I've only written Leo scripts that operate on things 'out 
there' somewhere. Here's the first Leo script I've written that modifies 
content in Leo. No doubt there's things to be done better/differently, 
important bits are hardcoded, but it actually works and does what I was 
looking for so I'm happy for today. ;-) 

-matt

*Put this in an empty node and run with Ctrl-B or [script-button].*

@language python
''' Search folder tree for the specified pattern

Windows only at present.

matt wilkie <[email protected]> Nov 2019
'''
import os
import shlex
import subprocess

# what to search for
pattern="dist.leo"
    #Todo: make this a parameter or prompt!

g.es_print('='*40)
g.es_print('Running search-dirs-for-string')

searchdir=os.path.join(g.app.loadDir, '../../*')

command = f'findstr -i -s -p "{pattern}" {searchdir}'
    # windows specific cmd

#g.es_print(shlex.split(command))  # debug

p = subprocess.run(shlex.split(command), 
        shell=True,
        stdout=subprocess.PIPE,
        stderr=None)

out = p.stdout
#err = p.stderr()
lines = [g.toUnicode(z) for z in g.splitLines(out or [])]
lines = [os.path.relpath(z, searchdir[:-2]) for z in lines]
    # Remove Leo app dir prefix, less noise

p2 = c.p.insertAfter()
p2.h = f"Find results: {pattern}"
p2.b = f"""--- Matches for {pattern} under:
--- {searchdir}

{''.join(lines)}
"""
c.selectPosition(p2)
c.redraw()
g.es_print('Results in next node')

'''Sources:

Run shell command and capture results:
LeoPyRef.leo#Found:shlex.split(command)-->g.execGitCommand

Put results into new node and redraw (EKR):
https://groups.google.com/d/topic/leo-editor/s16fP2pcxqM/discussion

Removing a path prefix (Mitch):
https://stackoverflow.com/questions/8693024/how-to-remove-a-path-prefix-in-python
'''


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