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"""Generate ~/.pi/agent/models.json from the repo and its fragments.
Run by link/pi.sh. It lives in a file rather than a heredoc inside $( ):
macOS ships bash 3.2, which does not skip heredoc content when it scans
for the end of a command substitution, so an odd number of apostrophes in
here would stop the whole script parsing -- which it did, on 2026-09-25.
"""
import glob, json, os, sys
base_path, frag_dir, target = sys.argv[1:4]
def load(path):
with open(path) as f:
return json.load(f)
# The repo's providers, then each fragment's. A fragment may add a provider or
# replace one of the same name; any other top-level key takes the last file's
# value. Which provider came from where is reported: a fragment quietly
# shadowing a provider the repo ships would otherwise be invisible.
desired = {}
notes = []
for path in [base_path] + sorted(glob.glob(os.path.join(frag_dir, "*.json"))):
try:
layer = load(path)
except (OSError, ValueError) as e:
print("error:cannot read %s: %s" % (path, e))
sys.exit(0)
for key, value in layer.items():
if key == "providers":
providers = desired.setdefault("providers", {})
if path != base_path:
for name in value:
notes.append("%s %s by %s" % (
name,
"replaced" if name in providers else "added",
os.path.basename(path),
))
providers.update(value)
else:
desired[key] = value
# A symlink is the pre-generation state: replace it, even with no fragments, so
# the live file is never the tracked one.
was_link = os.path.islink(target)
try:
current = None if was_link else load(target)
except (OSError, ValueError):
current = None
for note in notes:
print("note:" + note)
if current == desired:
print("unchanged:")
elif os.environ.get("DRY_RUN"):
print("would-write:" + ("replacing the link" if was_link else "merged changes"))
else:
tmp = target + ".dotfiles-tmp"
with open(tmp, "w") as f:
json.dump(desired, f, indent=2)
f.write("\n")
os.replace(tmp, target)
print("wrote:" + ("replaced the link" if was_link else "merged changes"))
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