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Add diff-advance exercise #365

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30 changes: 30 additions & 0 deletions diff-advance/README.md
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# Git Kata: Git Diff Advance

## Setup

Run `source setup.sh` or `bash setup.sh` or `./setup.sh` (or `.\setup.ps1` in PowerShell)

## Tasks

### Objectives: We will explore how git diff looks from different directions, `word-diff`, `name-only`, and a practical use case other than just to see diff.

1. Current branch is `pipeline-improvement`. Use `git diff` to see how it is different from master.
2. Compare `git diff master` and `git diff master pipeline-improvement`.
3. Compare `git diff master pipeline-improvement` and `git diff pipeline-improvement master`. Notice what is being removed and added.
4. Include `--word-diff` with `git diff`. In addition to the default, word diff can also be used in different modes, i.e. `--word-diff=color`. See how it is different from normal diff.
5. Include `--name-only` option with `git diff` and see the result.
6. With `--name-only`, we get a list of changed files. This can be useful for example when we want to do selective compile/test of changed files instead of a full re-build, given that steps can be compiled/tested independently. In our exercise, there are 3 steps in a pipeline and a utilities file. Let's say we only want to test the pipelines because we're confident enough with the utils to not test them (naughty-list programmer). We can do something like this:
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Consider using "an" instead of "a" before "utilities file" as it sounds more natural.

- a utilities file
+ an utilities file

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6. With `--name-only`, we get a list of changed files. This can be useful for example when we want to do selective compile/test of changed files instead of a full re-build, given that steps can be compiled/tested independently. In our exercise, there are 3 steps in a pipeline and a utilities file. Let's say we only want to test the pipelines because we're confident enough with the utils to not test them (naughty-list programmer). We can do something like this:
6. With `--name-only`, we get a list of changed files. This can be useful for example when we want to do selective compile/test of changed files instead of a full re-build, given that steps can be compiled/tested independently. In our exercise, there are 3 steps in a pipeline and an utilities file. Let's say we only want to test the pipelines because we're confident enough with the utils to not test them (naughty-list programmer). We can do something like this:


`git diff --name-only | grep .pipeline | xargs cat`

This will:
1. Get a list of the changed files
2. Filter for only `.pipeline` files
3. `cat`/test only these files
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Avoid redundancy by using synonyms or restructuring the sentence.

- `cat`/test only these files
+ `cat`/test these files

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Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.

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3. `cat`/test only these files
3. `cat`/test these files


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Clarify the example command to enhance understanding.

- `git diff --name-only | grep .pipeline | xargs cat`
+ `git diff --name-only | grep '.pipeline' | xargs cat`

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‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.

Suggested change
`git diff --name-only | grep .pipeline | xargs cat`
This will:
1. Get a list of the changed files
2. Filter for only `.pipeline` files
3. `cat`/test only these files
`git diff --name-only | grep '.pipeline' | xargs cat`
This will:
1. Get a list of the changed files
2. Filter for only `.pipeline` files
3. `cat`/test only these files

## Relevant commands and options
- `git diff`
- `--word-diff`
- `--name-only`
- `grep`
- `xargs`
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Ensure proper markdown formatting by adding blank lines around the list.

+ 
- `git diff`
- `--word-diff`
- `--name-only`
- `grep`
- `xargs`
+ 

Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.

Suggested change
## Relevant commands and options
- `git diff`
- `--word-diff`
- `--name-only`
- `grep`
- `xargs`
## Relevant commands and options
- `git diff`
- `--word-diff`
- `--name-only`
- `grep`
- `xargs`

17 changes: 17 additions & 0 deletions diff-advance/setup.ps1
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# Source utils
. ..\utils\make-exercise-repo.ps1

# Prep branches
Set-Content -Value "Step 1 before changes" -Path step1.pipeline
Set-Content -Value "Step 2 will remain unchanged" -Path step2.pipeline
Set-Content -Value "Step 3 before changes" -Path step3.pipeline
Set-Content -Value "Utilities before changes" -Path stepx.utils
git add .
git commit -m "Initial commit"

git checkout -b pipeline-improvement
Set-Content -Value "Step 1 after improvement" -Path step1.pipeline
Set-Content -Value "Step 3 after changes" -Path step3.pipeline
Set-Content -Value "Utilities after changes" -Path stepx.utils
git add .
git commit -m "Improve pipeline - name change"
23 changes: 23 additions & 0 deletions diff-advance/setup.sh
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#!/bin/bash

# Source utils
source ../utils/utils.sh

# Prep repo
kata="git-diff-advance"
make-exercise-repo

# Prep branches
echo "Step 1 before changes" > step1.pipeline
echo "Step 2 will remain unchanged" > step2.pipeline
echo "Step 3 before changes" > step3.pipeline
echo "Utilities before changes" > stepx.utils
git add .
git commit -m "Initial commit"

git checkout -b pipeline-improvement
echo "Step 1 after improvement" > step1.pipeline
echo "Step 3 after changes" > step3.pipeline
echo "Utilities after changes" > stepx.utils
git add .
git commit -m "Improve pipeline - name change"
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