From 4695cb721e05d8ce838f712045a296546b5eae2e Mon Sep 17 00:00:00 2001
From: David Mejorado <david.mejorado@gmail.com>
Date: Sun, 23 Feb 2025 13:03:24 -0800
Subject: [PATCH 1/2] Don't assume brew is available in the system

All we care about is that GNU grep is available, which could've been
installed in a number of ways, not just via Homebrew.
---
 lib/helpers.sh | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/helpers.sh b/lib/helpers.sh
index 0f0de24..a86a3e2 100755
--- a/lib/helpers.sh
+++ b/lib/helpers.sh
@@ -147,13 +147,16 @@ function error_and_proceed() {
 export -f error_and_proceed;
 
 function check_dependencies() {
-  if [[ $(uname) == 'Darwin' ]] && [ $(which brew) ]; then
-    if ! [ $(which ggrep) ]; then
-      log 'error' 'A metaphysical dichotomy has caused this unit to overload and shut down. GNU Grep is a requirement and your Mac does not have it. Consider "brew install grep"';
+  if [[ $(uname) == 'Darwin' ]]; then
+    # If installed through brew, it will be available as `ggrep`, so we alias it to `grep`
+    if command -v ggrep >/dev/null 2>&1; then
+      shopt -s expand_aliases;
+      alias grep=ggrep;
     fi;
 
-    shopt -s expand_aliases;
-    alias grep=ggrep;
+    if ! grep --version 2>&1 | grep -q "GNU grep"; then
+      log 'error' 'GNU Grep is a requirement and your Mac does not have it. Consider installing it with `brew install grep` or `nix profile install nixpkgs#gnugrep`';
+    fi;
   fi;
 };
 export -f check_dependencies;

From d57fdd50b49a1c5852ce51f6f2ca1f3b15c83a60 Mon Sep 17 00:00:00 2001
From: David Mejorado <david.mejorado@gmail.com>
Date: Fri, 4 Jul 2025 13:08:52 -0700
Subject: [PATCH 2/2] Fix brew-specific check

When we find a brew-installed grep, we create an alias from ggrep to
grep, but an alias can't be defined and used in the same parsing unit,
so we exit early instead.

See: https://www.shellcheck.net/wiki/SC2262
---
 lib/helpers.sh       | 4 ++++
 test/install_deps.sh | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/lib/helpers.sh b/lib/helpers.sh
index a86a3e2..933a283 100755
--- a/lib/helpers.sh
+++ b/lib/helpers.sh
@@ -152,6 +152,10 @@ function check_dependencies() {
     if command -v ggrep >/dev/null 2>&1; then
       shopt -s expand_aliases;
       alias grep=ggrep;
+
+      # The alias can't be defined and used in the same parsing unit. But
+      # since we know the correct package is installed, we can exit early.
+      return;
     fi;
 
     if ! grep --version 2>&1 | grep -q "GNU grep"; then
diff --git a/test/install_deps.sh b/test/install_deps.sh
index f1bd2d6..30333c0 100755
--- a/test/install_deps.sh
+++ b/test/install_deps.sh
@@ -3,4 +3,7 @@ set -uo pipefail;
 
 if [[ $(uname) == 'Darwin' ]] && [ $(which brew) ]; then
   brew install grep;
+  if [[ -n ${GITHUB_PATH+x} ]]; then
+    echo "/opt/homebrew/opt/grep/libexec/gnubin" >> $GITHUB_PATH
+  fi
 fi;