refactor(shell-integration): refactor to make cases alphabetical

also refactors elvish file to evade unobvious returns
and tries to fix some build errors

src/config/Config.zig

@@ -847,7 +847,7 @@ keybind: Keybinds = .{},
 ///
 ///   * `detect` - Detect the shell based on the filename.
 ///
-///   * `bash`, `fish`, `zsh` - Use this specific shell injection scheme.
+///   * `bash`, `elvish`, `fish`, `zsh` - Use this specific shell injection scheme.
 ///
 /// The default value is `detect`.
 @"shell-integration": ShellIntegration = .detect,
@@ -3412,9 +3412,9 @@ pub const ShellIntegration = enum {
     none,
     detect,
     bash,
+    elvish,
     fish,
     zsh,
-    elvish,
 };
 
 /// Shell integration features

src/termio/Exec.zig

@@ -1024,6 +1024,7 @@ const Subprocess = struct {
                 .none => break :shell .{ null, default_shell_command },
                 .detect => null,
                 .bash => .bash,
+                .elvish => .elvish,
                 .fish => .fish,
                 .zsh => .zsh,
             };

src/termio/shell_integration.zig

@@ -10,9 +10,9 @@ const log = std.log.scoped(.shell_integration);
 /// Shell types we support
 pub const Shell = enum {
     bash,
+    elvish,
     fish,
     zsh,
-    elvish,
 };
 
 /// The result of setting up a shell integration.
@@ -46,9 +46,9 @@ pub fn setup(
 ) !?ShellIntegration {
     const exe = if (force_shell) |shell| switch (shell) {
         .bash => "bash",
+        .elvish => "elvish",
         .fish => "fish",
         .zsh => "zsh",
-        .elvish => "elvish",
     } else exe: {
         // The command can include arguments. Look for the first space
         // and use the basename of the first part as the command's exe.
@@ -70,18 +70,18 @@ pub fn setup(
             };
         }
 
-        if (std.mem.eql(u8, "fish", exe)) {
+        if (std.mem.eql(u8, "elvish", exe)) {
-            try setupFish(alloc_arena, resource_dir, env);
+            try setupXdgDataDirs(alloc_arena, resource_dir, env);
             break :shell .{
-                .shell = .fish,
+                .shell = .elvish,
                 .command = command,
             };
         }
 
-        if (std.mem.eql(u8, "elvish", exe)) {
+        if (std.mem.eql(u8, "fish", exe)) {
-            try setupElvish(alloc_arena, resource_dir, env);
+            try setupXdgDataDirs(alloc_arena, resource_dir, env);
             break :shell .{
-                .shell = .elvish,
+                .shell = .fish,
                 .command = command,
             };
         }
@@ -415,11 +415,14 @@ test "bash: preserve ENV" {
     }
 }
 
-/// Setup the fish automatic shell integration. This works by
+/// Setup automatic shell integration for shells that include
-/// modify XDG_DATA_DIRS to include the resource directory.
+/// their modules from paths in `XDG_DATA_DIRS` env variable.
-/// Fish will automatically load configuration in XDG_DATA_DIRS
+///
-/// "fish/vendor_conf.d/*.fish".
+/// Path of shell-integration dir is prepended to `XDG_DATA_DIRS`.
-fn setupFish(
+/// It is also saved in `GHOSTTY_INTEGRATION_DIR` variable so that
+/// the shell can refer to it and safely remove this directory
+/// from `XDG_DATA_DIRS` when integration is complete.
+fn setupXdgDataDirs(
     alloc_arena: Allocator,
     resource_dir: []const u8,
     env: *EnvMap,
@@ -436,7 +439,7 @@ fn setupFish(
     // Set an env var so we can remove this from XDG_DATA_DIRS later.
     // This happens in the shell integration config itself. We do this
     // so that our modifications don't interfere with other commands.
-    try env.put("GHOSTTY_FISH_XDG_DIR", integ_dir);
+    try env.put("GHOSTTY_INTEGRATION_DIR", integ_dir);
 
     if (env.get("XDG_DATA_DIRS")) |old| {
         // We have an old value, We need to prepend our value to it.
@@ -462,18 +465,6 @@ fn setupFish(
     }
 }
 
-/// Setup the Elvish automatic shell integration.
-/// This reuses integration primitives of Fish, as Elvish also
-/// loads config in XDG_DATA_DIRS (except it imports
-/// "./elvish/lib/*.elv" files).
-fn setupElvish(
-    alloc_arena: Allocator,
-    resource_dir: []const u8,
-    env: *EnvMap,
-) !void {
-    try setupFish(alloc_arena, resource_dir, env);
-}
-
 /// Setup the zsh automatic shell integration. This works by setting
 /// ZDOTDIR to our resources dir so that zsh will load our config. This
 /// config then loads the true user config.