Add a diff driver for composer.lock files

Author: dotdash

README.md

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+# git diff drivers
+
+## Usage
+
+To use any of these diff drivers, add them to your `$PATH`, add a git config
+entry to your (global) git config and then set a matching git attribute for the
+files you want to use the driver for. There's a config and attribute example
+given for each driver.
+
+Note that many git tools, like `git log` and `git show` will only utilize diff
+drivers if you use the `--ext-diff` flag.
+
+## composer-lock-diff-driver
+
+The composer-lock-diff-driver utilizes
+[composer-lock-diff](https://github.com/davidrjonas/composer-lock-diff) to
+display changes to `composer.lock` files in a more readable way.
+
+### git config
+
+```bash
+git config --global diff.composer-lock-diff.command composer-lock-diff-driver
+```
+
+### .gitattributes
+
+```
+composer.lock diff=composer-lock-diff
+```

composer-lock-diff-driver

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+#!/bin/bash
+
+NEW_FILE=$1
+OLD_FILE=$1
+NEW_REV="$(git rev-parse --short $6)"
+INDEX_MODE=$7
+
+if [ "$2" = "/dev/null" ]; then
+  OLD_REV=0000000
+  OLD_FILE=$2
+  INDEX_MODE=
+else
+  OLD_REV="$(git rev-parse --short $3)"
+fi
+
+echo -e "\e[1mdiff --git $1 $1"
+
+if [ "$2" = "/dev/null" ]; then
+  echo -e "\e[1mnew file mode $7"
+fi
+
+echo -e "\e[1mindex $OLD_REV..$NEW_REV $INDEX_MODE"
+echo -e "\e[1m--- $OLD_FILE"
+echo -e "\e[1m+++ $NEW_FILE"
+
+if [ "$2" = "/dev/null" ]; then
+  echo '{"packages":[],"packages-dev":[]}' | exec composer-lock-diff --from php://fd/0 --to "$5"
+else
+  exec composer-lock-diff --from "$2" --to "$5"
+fi