start shell-integration folder, copy into zig-out

build.zig

@@ -269,6 +269,28 @@ pub fn build(b: *std.Build) !void {
         }
     }
 
+    // Shell-integration
+    {
+        const install = b.addInstallDirectory(.{
+            .source_dir = .{ .path = "src/shell-integration" },
+            .install_dir = .{ .custom = "share" },
+            .install_subdir = "shell-integration",
+            .exclude_extensions = &.{".md"},
+        });
+        b.getInstallStep().dependOn(&install.step);
+
+        if (target.isDarwin()) {
+            const mac_install = b.addInstallDirectory(options: {
+                var copy = install.options;
+                copy.install_dir = .{
+                    .custom = "Ghostty.app/Contents/Resources",
+                };
+                break :options copy;
+            });
+            b.getInstallStep().dependOn(&mac_install.step);
+        }
+    }
+
     // Terminfo
     {
         // Encode our terminfo

src/shell-integration/README.md

@@ -0,0 +1,20 @@
+# Shell Integration Code
+
+This is the shell-specific shell-integration code that is
+used for the shell-integration feature set that Ghostty
+supports.
+
+This README is meant as developer documentation and not as
+user documentation. For user documentation, see the main
+README.
+
+## Implementation Details
+
+### Fish
+
+For [Fish](https://fishshell.com/), Ghostty prepends to the
+`XDG_DATA_DIRS` directory. Fish automatically loads configuration
+files in `<XDG_DATA_DIR>/fish/vendor_conf.d/*.fish` on startup,
+allowing us to automatically integrate with the shell. For details
+on the Fish startup process, see the
+[Fish documentation](https://fishshell.com/docs/current/language.html).

src/shell-integration/fish/vendor_conf.d/ghostty-shell-integration.fish

@@ -0,0 +1,3 @@
+#!/bin/fish
+
+echo GHOSTTY INTEGRATION LOADING