From ba1efa71ae3d5055e3076eaad7cf7e6a6e800066 Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Wed, 29 Jun 2022 21:04:31 +0300
Subject: [PATCH] stdenv: substituteInPlace: accept multiple filenames

I don't know if getopt is available everywhere, so I did not use it.

in any case, it can be changed to use getopt in the future if
needed.
---
 doc/stdenv/stdenv.chapter.md |  4 ++--
 pkgs/stdenv/generic/setup.sh | 15 ++++++++++++---
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/doc/stdenv/stdenv.chapter.md b/doc/stdenv/stdenv.chapter.md
index b57698cb90b..83464a759a5 100644
--- a/doc/stdenv/stdenv.chapter.md
+++ b/doc/stdenv/stdenv.chapter.md
@@ -913,9 +913,9 @@ substitute ./foo.in ./foo.out \
     --subst-var someVar
 ```
 
-### `substituteInPlace` \<file\> \<subs\> {#fun-substituteInPlace}
+### `substituteInPlace` \<multiple files\> \<subs\> {#fun-substituteInPlace}
 
-Like `substitute`, but performs the substitutions in place on the file \<file\>.
+Like `substitute`, but performs the substitutions in place on the files passed.
 
 ### `substituteAll` \<infile\> \<outfile\> {#fun-substituteAll}
 
diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index de8d13160f9..0ba8d101823 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -771,9 +771,18 @@ substitute() {
 }
 
 substituteInPlace() {
-    local fileName="$1"
-    shift
-    substitute "$fileName" "$fileName" "$@"
+    local -a fileNames=()
+    for arg in "$@"; do
+        if [[ "$arg" = "--"* ]]; then
+            break
+        fi
+        fileNames+=("$arg")
+        shift
+    done
+
+    for file in "${fileNames[@]}"; do
+        substitute "$file" "$file" "$@"
+    done
 }
 
 _allFlags() {