2 files changed, 43 insertions, 4 deletions
diff --git a/tools/fs_patch.sh b/tools/fs_patch.sh
new file mode 100755
index 0000000..14e46d2
--- /dev/null
+++ b/tools/fs_patch.sh
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -e
+
+# @describe Apply a patch to a file at the specified path.
+# This can be used to edit the file, without having to rewrite the whole file.
+
+# @option --path! The path of the file to apply to
+# @option --contents! The patch to apply to the file
+#
+# Here is an example of a patch block that can be applied to modify the file to request the user's name:
+# --- a/hello.py
+# +++ b/hello.py
+# \@@ ... @@
+#  def hello():
+# -    print("Hello World")
+# +    name = input("What is your name? ")
+# +    print(f"Hello {name}")
+
+# @env LLM_OUTPUT=/dev/stdout The output path
+
+main() {
+    if [ ! -f "$argc_path" ]; then
+        echo "Not found file: $argc_path"
+        exit 1
+    fi
+    root_dir="${LLM_ROOT_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
+    new_contents="$(awk -f "$root_dir/utils/patch.awk" "$argc_path" <(printf "%s" "$argc_contents"))"
+    printf "%s" "$new_contents" | git diff --no-index "$argc_path" - || true
+    if [ -t 1 ]; then
+        echo
+        read -r -p "Apply changes? [Y/n] " ans
+        if [[ "$ans" == "N" || "$ans" == "n" ]]; then
+            echo "Aborted!"
+            exit 1
+        fi
+    fi
+    printf "%s" "$new_contents" > "$argc_path"
+
+    echo "The patch applied to: $argc_path" >> "$LLM_OUTPUT"
+}
+
+eval "$(argc --argc-eval "$0" "$@")"
diff --git a/tools/fs_write.sh b/tools/fs_write.sh
index bdf8e85..0e0dba0 100755
--- a/tools/fs_write.sh
+++ b/tools/fs_write.sh
@@ -1,10 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-# @describe Write the contents to a file at the specified path.
-# If the file exists, only the necessary changes will be applied.
-# If the file doesn't exist, it will be created.
-# Always provide the full intended contents of the file.
+# @describe Write the full file contents to a file at the specified path.
 
 # @option --path! The path of the file to write to
 # @option --contents! The full contents to write to the file