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printer: do not print inline diff for multiline insert/delete chunks #66

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merged 1 commit into from Mar 9, 2021

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@tommilligan tommilligan commented Mar 8, 2021

Inline diffing with the boundary of multiline chunks looks bad, and is counter-intuitive. For this reason, most diff implementations don't do it (such as Github).

We also shouldn't do this kind of inline diffing if there are more lines deleted preceding, or more lines inserted following, the boundary.

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codecov-io commented Mar 9, 2021

Codecov Report

Merging #66 (8f7d7a5) into main (7f6ae17) will decrease coverage by 0.43%.
The diff coverage is 97.22%.

Impacted file tree graph

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   99.39%   98.96%   -0.44%     
==========================================
  Files           2        2              
  Lines         166      193      +27     
==========================================
+ Hits          165      191      +26     
- Misses          1        2       +1     
Impacted Files Coverage Δ
src/printer.rs 99.24% <97.22%> (-0.76%) ⬇️

Continue to review full report at Codecov.

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@tommilligan tommilligan merged commit fdff5f3 into colin-kiegel:main Mar 9, 2021
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bors bot added a commit to jonasbb/serde_with that referenced this issue Mar 13, 2021
279: Update pretty_assertions requirement from 0.6.1 to 0.7.1 r=jonasbb a=dependabot[bot]

Updates the requirements on [pretty_assertions](https://github.com/colin-kiegel/rust-pretty-assertions) to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/colin-kiegel/rust-pretty-assertions/releases">pretty_assertions's releases</a>.</em></p>
<blockquote>
<h2>v0.7.1</h2>
<h2>Fixed</h2>
<ul>
<li>Fix a bug where multiline changes showed an unhelpful inline diff (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/colin-kiegel/rust-pretty-assertions/blob/main/CHANGELOG.md">pretty_assertions's changelog</a>.</em></p>
<blockquote>
<h1>v0.7.1</h1>
<ul>
<li>Fix a bug where multiline changes showed an unhelpful inline diff (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h1>v0.7.0</h1>
<h2>Changed</h2>
<ul>
<li>Move from <code>difference</code> to <code>diff</code> for calculating diffs. The exact assertion messages generated may differ from previous versions. (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/52">#52</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<p>For example, the following assertion message from <code>v0.7.0</code>:</p>
<p><img src="https://raw.githubusercontent.com/colin-kiegel/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion.png" alt="pretty assertion" /></p>
<p>Was previously rendered like this in <code>v0.6.1</code>:</p>
<p><img src="https://raw.githubusercontent.com/colin-kiegel/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion_v0_6_1.png" alt="pretty assertion" /></p>
<h2>Added</h2>
<ul>
<li>Support for unsized values (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/42">#42</a>, <a href="https://github.com/stanislav-tkach"><code>@​stanislav-tkach</code></a>)</li>
<li>Document the <code>Comparison</code> struct, which was previously hidden. This can be used to generate a pretty diff of two values without panicking. (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/52">#52</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h2>Fixed</h2>
<ul>
<li>Fix some unhygenic macro expansions (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/41">#41</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h2>Internal</h2>
<ul>
<li>Test Windows targets in CI (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/46">#46</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
<li>Bump <code>ansi_term</code> version to 0.12 (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/34">#34</a>, <a href="https://github.com/waywardmonkeys"><code>@​waywardmonkeys</code></a>)</li>
<li>Code health improvements (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/34">#34</a>, <a href="https://github.com/waywardmonkeys"><code>@​waywardmonkeys</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/2667441b0edb3322eab7d7779a3a96c280414ddf"><code>2667441</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/68">#68</a> from tommilligan/prep-v0.7.1</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/6dde470f579a2bf88251a6e4eb1a691be3d19920"><code>6dde470</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/67">#67</a> from tommilligan/ci-revert-cargo-target-dir</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/b517e396dbbce136a27756732080a1a592e74eca"><code>b517e39</code></a> chore: prepare for v0.7.1</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/fdff5f32f967a171cbb59dbb18e814532bf594a5"><code>fdff5f3</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a> from tommilligan/chunk-diffing</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/62e93575ffc081c36f779da188057a51df555734"><code>62e9357</code></a> Revert &quot;ci: remove concern with CARGO_TARGET_DIR&quot;</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/8f7d7a5ee00a2e36885fc016fb13e91c062dd7ae"><code>8f7d7a5</code></a> printer: do not print inline diff for multiline insert/delete chunks</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/083ce2ebe4892fb219f36beb764065920de0f96b"><code>083ce2e</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/65">#65</a> from tommilligan/ci-rm-cargo-target-dir</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/56a0aaa6185e2e5db46aef54fb61a4388f89943f"><code>56a0aaa</code></a> ci: remove concern with CARGO_TARGET_DIR</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/7f6ae17e0046d1ddb55291cf7ea7064c8630fbf5"><code>7f6ae17</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/63">#63</a> from tommilligan/update-gitignore</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/ccb2e45112471740a61ce82565ab5ffe916c6d3d"><code>ccb2e45</code></a> ci: update gitignore</li>
<li>Additional commits viewable in <a href="https://github.com/colin-kiegel/rust-pretty-assertions/compare/v0.6.1...v0.7.1">compare view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
bors bot added a commit to jonasbb/rust_misc_utils that referenced this issue Mar 13, 2021
62: Update pretty_assertions requirement from 0.6 to 0.7 r=jonasbb a=dependabot[bot]

Updates the requirements on [pretty_assertions](https://github.com/colin-kiegel/rust-pretty-assertions) to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/colin-kiegel/rust-pretty-assertions/releases">pretty_assertions's releases</a>.</em></p>
<blockquote>
<h2>v0.7.1</h2>
<h2>Fixed</h2>
<ul>
<li>Fix a bug where multiline changes showed an unhelpful inline diff (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/colin-kiegel/rust-pretty-assertions/blob/main/CHANGELOG.md">pretty_assertions's changelog</a>.</em></p>
<blockquote>
<h1>v0.7.1</h1>
<ul>
<li>Fix a bug where multiline changes showed an unhelpful inline diff (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h1>v0.7.0</h1>
<h2>Changed</h2>
<ul>
<li>Move from <code>difference</code> to <code>diff</code> for calculating diffs. The exact assertion messages generated may differ from previous versions. (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/52">#52</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<p>For example, the following assertion message from <code>v0.7.0</code>:</p>
<p><img src="https://raw.githubusercontent.com/colin-kiegel/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion.png" alt="pretty assertion" /></p>
<p>Was previously rendered like this in <code>v0.6.1</code>:</p>
<p><img src="https://raw.githubusercontent.com/colin-kiegel/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion_v0_6_1.png" alt="pretty assertion" /></p>
<h2>Added</h2>
<ul>
<li>Support for unsized values (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/42">#42</a>, <a href="https://github.com/stanislav-tkach"><code>@​stanislav-tkach</code></a>)</li>
<li>Document the <code>Comparison</code> struct, which was previously hidden. This can be used to generate a pretty diff of two values without panicking. (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/52">#52</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h2>Fixed</h2>
<ul>
<li>Fix some unhygenic macro expansions (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/41">#41</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
</ul>
<h2>Internal</h2>
<ul>
<li>Test Windows targets in CI (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/46">#46</a>, <a href="https://github.com/tommilligan"><code>@​tommilligan</code></a>)</li>
<li>Bump <code>ansi_term</code> version to 0.12 (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/34">#34</a>, <a href="https://github.com/waywardmonkeys"><code>@​waywardmonkeys</code></a>)</li>
<li>Code health improvements (<a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/34">#34</a>, <a href="https://github.com/waywardmonkeys"><code>@​waywardmonkeys</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/2667441b0edb3322eab7d7779a3a96c280414ddf"><code>2667441</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/68">#68</a> from tommilligan/prep-v0.7.1</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/6dde470f579a2bf88251a6e4eb1a691be3d19920"><code>6dde470</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/67">#67</a> from tommilligan/ci-revert-cargo-target-dir</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/b517e396dbbce136a27756732080a1a592e74eca"><code>b517e39</code></a> chore: prepare for v0.7.1</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/fdff5f32f967a171cbb59dbb18e814532bf594a5"><code>fdff5f3</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/66">#66</a> from tommilligan/chunk-diffing</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/62e93575ffc081c36f779da188057a51df555734"><code>62e9357</code></a> Revert &quot;ci: remove concern with CARGO_TARGET_DIR&quot;</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/8f7d7a5ee00a2e36885fc016fb13e91c062dd7ae"><code>8f7d7a5</code></a> printer: do not print inline diff for multiline insert/delete chunks</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/083ce2ebe4892fb219f36beb764065920de0f96b"><code>083ce2e</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/65">#65</a> from tommilligan/ci-rm-cargo-target-dir</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/56a0aaa6185e2e5db46aef54fb61a4388f89943f"><code>56a0aaa</code></a> ci: remove concern with CARGO_TARGET_DIR</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/7f6ae17e0046d1ddb55291cf7ea7064c8630fbf5"><code>7f6ae17</code></a> Merge pull request <a href="https://github.com/colin-kiegel/rust-pretty-assertions/issues/63">#63</a> from tommilligan/update-gitignore</li>
<li><a href="https://github.com/colin-kiegel/rust-pretty-assertions/commit/ccb2e45112471740a61ce82565ab5ffe916c6d3d"><code>ccb2e45</code></a> ci: update gitignore</li>
<li>Additional commits viewable in <a href="https://github.com/colin-kiegel/rust-pretty-assertions/compare/v0.6.0...v0.7.1">compare view</a></li>
</ul>
</details>
<br />


Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
@tommilligan tommilligan deleted the chunk-diffing branch May 1, 2021
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