IVYXSTUDIO · IVY NODE

Text Change Detect

ivy.node.text-change-detect · v0.1.0

ivyx✓

Compares a text with the one stored under the same key last time, stores the new one, and returns whether it changed with the lines added and removed. The first run stores the text and reports no change.

#monitor#diff#change#state

Inputs

Field	Type	Description
keyrequired	string	What is being watched, such as the page's address.
textrequired	string	The current text.
state_dir	string	Where the last text of each key is kept.

Outputs

Field	Type	Description
changedrequired	boolean	True when the text differs from last time.
first_runrequired	boolean	True when nothing was stored for this key.
added_linesrequired	array	Lines that are new.
removed_linesrequired	array	Lines that are gone.
diffrequired	string	The added lines with '+ ' and the removed ones with '- '.

Source

python

inp = __ivy_ctx__["nodes"][__ivy_node_id__]["input"]

import difflib, hashlib, os, re

key = inp["key"]
text = inp["text"]
state_dir = inp.get("state_dir", ".punica/ivy-state")
slug = re.sub(r"[^A-Za-z0-9._-]+", "-", key).strip("-")[:80] or "key"
path = os.path.join(state_dir, slug + "-" + hashlib.sha1(key.encode()).hexdigest()[:8] + ".txt")
previous = None
if os.path.exists(path):
    with open(path, encoding="utf-8") as handle:
        previous = handle.read()
os.makedirs(state_dir, exist_ok=True)
with open(path, "w", encoding="utf-8") as handle:
    handle.write(text)
added, removed = [], []
if previous is not None:
    for line in difflib.ndiff(previous.splitlines(), text.splitlines()):
        if line.startswith("+ "):
            added.append(line[2:])
        elif line.startswith("- "):
            removed.append(line[2:])

out = __ivy_ctx__["nodes"][__ivy_node_id__]["output"]
out["changed"] = previous is not None and previous != text
out["first_run"] = previous is None
out["added_lines"] = added
out["removed_lines"] = removed
out["diff"] = "\n".join(["+ " + l for l in added] + ["- " + l for l in removed])

Tests

Requires: python:3.9

first-run
Nothing stored yet: the text is kept and no change reported.
changed
A changed line is reported as one removed and one added.