umputun / revdiff / 24852781334

coverage: 89.355% (-0.2%) from 89.581%
24852781334

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feat(diff): line-count labels on compact-mode dividers (⋯ N lines ⋯) (#146)

* feat(diff): show line count in between-hunk and leading dividers

parser computes the gap from hunk-header metadata and renders it as
"⋯ N lines ⋯" (midline horizontal ellipsis). previously dividers were
a static "...".

uses prevOldEnd tracked via parsed hunk lengths rather than oldNum, so
insertion-only hunks (@@ -K,0 ...) compute correctly — oldNum does not
advance on `+` body lines. max(oldLen, 1) handles both omitted-length
(git implicit 1) and literal-zero cases. leading divider appears when
the first hunk starts after line 1; trailing divider is out of scope
(needs total file-line count threaded through Renderer).

Related to #145

* feat(diff): add trailing divider showing lines after last hunk

parseUnifiedDiff now accepts totalOldLines and emits a "⋯ N lines ⋯"
divider at the end when the last hunk does not reach EOF. each VCS
implementation (git/hg/jj) computes the pre-change file's line count
via git show / hg cat / jj file show against the resolved old-ref
(range ref left operand, single ref, or sensible default).

extracts appendGapDivider helper to unify leading / between-hunks /
trailing emission — same "⋯ N lines ⋯" format, different gap source.

test callers updated to pass 0 (unknown total, skip trailing). 6 new
parser-level tests cover trailing plural / singular / no-trailing /
unknown-total / leading+between+trailing / empty-diff cases.

Related to #145

* fix(diff): address code review findings for divider work

- git totalOldLines: check "..." before ".." in ref splitting so A...B
  takes left operand A (not "A" + ".B"). triple-dot ranges still show
  the left operand of the range rather than merge-base, which is
  approximate but matches hg/jj behavior.
- gate totalOldLines subprocess behind compact mode in all VCS impls;
  full-file mode always reaches EOF so the trailing-divider probe was
  a wasted subprocess (~2× process launches per FileDiff cal... (continued)

75 of 107 new or added lines in 3 files covered. (70.09%)

61 existing lines in 3 files now uncovered.

8251 of 9234 relevant lines covered (89.35%)

454.07 hits per line

Source File
Press 'n' to go to next uncovered line, 'b' for previous

92.23
/app/diff/diff.go


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