fixes #2603: support fish plugin in install script (#2604)

* fix: support fish plugin in install script

* fix sed command on Linux for fish plugin install

* light touch refactor for consistent and clearer cross-platform support

* start the final end at the beginning of the line

* ignore leading whitespace in fish config

1 files changed, 16 insertions, 0 deletions

diff --git a/install.sh b/install.sh
index a9babac1..35032fd3 100755
--- a/install.sh
+++ b/install.sh
@@ -53,6 +53,22 @@ if ! grep -q "atuin init bash" ~/.bashrc; then
   echo 'eval "$(atuin init bash)"' >> ~/.bashrc
 fi
 
+if [ -f "$HOME/.config/fish/config.fish" ]; then
+  # Check if the line already exists to prevent duplicates
+  if ! grep -q "atuin init fish" "$HOME/.config/fish/config.fish"; then
+        # Detect BSD or GNU sed
+        if sed --version >/dev/null 2>&1; then
+          # GNU
+          sed -i '/if status is-interactive/,/end/ s/end$/    atuin init fish | source\
+end/' "$HOME/.config/fish/config.fish"
+        else
+          # BSD (macOS)
+          sed -i '' '/if status is-interactive/,/end/ s/end$/    atuin init fish | source\
+end/' "$HOME/.config/fish/config.fish"
+        fi
+    fi
+fi
+
 cat << EOF