Git Patch - new file mode Header
A file creation carried by the `new file mode 100644` extended header rather than by the paths alone. The mode is the authoritative signal: the `--- /dev/null` line tells you the old side is empty, but only the header tells you what permissions to create the file with.
From f27ade02150fbbbfe7f493ad141de516e72cdcab Mon Sep 17 00:00:00 2001
From: Miguel Otero <miguel.otero@example.invalid>
Date: Wed, 4 Mar 2026 11:02:19 +0000
Subject: [PATCH] feat(ledger): add banker's rounding helper
Long runs of half-up rounding drift the balance upward by a cent
every few thousand postings.
---
internal/ledger/rounding.go | 17 +++++++++++++++++
1 file changed, 17 insertions(+), 0 deletions(-)
create mode 100644 internal/ledger/rounding.go
diff --git a/internal/ledger/rounding.go b/internal/ledger/rounding.go
new file mode 100644
index 0000000..d6f0c19
--- /dev/null
+++ b/internal/ledger/rounding.go
@@ -0,0 +1,17 @@
+package ledger
+
+// HalfEven rounds a minor-unit amount to the nearest multiple of step using
+// banker's rounding, which keeps long runs of postings from drifting upward.
+func HalfEven(minor, step int64) int64 {
+ if step <= 1 {
+ return minor
+ }
+ q, r := minor/step, minor%step
+ switch {
+ case 2*r > step:
+ q++
+ case 2*r == step && q%2 != 0:
+ q++
+ }
+ return q * step
+}
--
2.43.0
Specifications
- Seed
- 20260807
- Extended Header
- new file mode 100644
- Files
- 1
- Old Path
- /dev/null
- Creates
- internal/ledger/rounding.go
- Line Endings
- LF
- Encoding
- UTF-8
Testing contract
Expected to pass- Scenario
- Apply a patch that creates a file and check the resulting permission bits.
- Expected result
- internal/ledger/rounding.go is created with mode 100644 and the full contents of the + lines.
What is a .patch file?
A .patch file is a unified diff packaged for transmission, most often as produced by `git format-patch`. Beyond the diff itself it carries an email-style header with the author, date, and commit subject, a commit message body, per-file `diff --git` headers recording renames and mode changes, and hunk headers of the form `@@ -old,count +new,count @@`. Applying it reconstructs a specific change against a specific before-state.
How to use this file
Use an example .patch file to test patch application, code-review renderers, and diff parsers: exercising renames, mode changes, binary hunks, added and deleted files, and the `\ No newline at end of file` marker that naive parsers silently drop.
How to use this file for testing
“Git Patch - new file mode Header” is a deterministic Testaroo fixture for Visual diff / regression, Code parsing, Editor testing. A/B image twins with controlled pixel changes, anti-alias variants, and UI chrome crops for screenshot diff and visual regression tools.
Documented properties for this file: seed 20260807 · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.
Diff and patch fixtures name their target paths and the exact edge case they exercise, rename, mode change, binary hunk, CRLF↔LF, or missing trailing newline. Apply or render them against the documented before-state; every author, path, and hash is fictional.
Treat A/B twins as a visual regression unit: run your pixel or perceptual diff, assert a non-zero delta on the changed twin, and keep thresholds calibrated against the documented change kind in specs.
Generated by generation/version_control.py. Free for any use, no attribution required, license.
Related files
- patchGit Format-Patch Series - 0000 Cover LetterThe `--cover-letter` message git writes ahead of a series: a `[PATCH 0/3]` subject, a shortlog of the authors and their subjects, and the combined diffstat, but no diff of its own. Series tooling has to recognise it as metadata and not try to apply it.
- patchGit Format-Patch Series - 0001 of 3Patch 1 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Format-Patch Series - 0002 of 3Patch 2 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Format-Patch Series - 0003 of 3Patch 3 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Patch - Copy Detection at similarity index 85%`copy from`/`copy to` headers, produced only when copy detection is enabled with `-C`. The source file still exists afterwards, which is the whole difference from a rename, and the difference a parser that maps both header pairs onto one 'moved' concept silently erases.
- patchGit Patch - Pure Rename at similarity index 100%A rename with no content change at all: `similarity index 100%`, `rename from`, `rename to`, and then nothing, no index line and no hunks. This is the single most common patch shape that naive parsers lose, because there is no `@@` anywhere in the file section.
