fish_config: fix "prompt/theme show" in embed-data builds

Fixes #11832

(cherry picked from commit 29a35a7951)

CHANGELOG.rst

@@ -1,3 +1,10 @@
+fish 4.1.1 (released ???)
+=========================
+
+This release fixes the following regressions identified in 4.1.0:
+
+- Some :doc:`fish_config <cmds/fish_config>` subcommands for prompts and themes were broken in standalone Linux builds (those using the ``embed-data`` cargo feature), which has been fixed (:issue:`11832`).
+
 fish 4.1.0 (released September 27, 2025)
 ========================================
 

README.rst

@@ -180,7 +180,7 @@ To install fish with embedded files, just use ``cargo``, like::
    cargo install --git https://github.com/fish-shell/fish-shell --tag "$(curl -s https://api.github.com/repos/fish-shell/fish-shell/releases/latest | jq -r .tag_name)" # to build the latest release
    cargo install --git https://github.com/fish-shell/fish-shell # to build the latest development snapshot
 
-This will place the binaries in ``~/.cargo/bin/``, but you can place them wherever you want.
+This will place the standalone binaries in ``~/.cargo/bin/``, but you can place them wherever you want.
 
 This build won't have the HTML docs (``help`` will open the online version).
 It will try to build the man pages with sphinx-build. If that is not available and you would like to include man pages, you need to install it and retrigger the build script, e.g. by setting FISH_BUILD_DOCS=1::

share/functions/fish_config.fish

@@ -91,14 +91,27 @@ function fish_config --description "Launch fish's web based configuration"
             switch $cmd
                 case show
                     set -l fish (status fish-path)
-                    set -l prompts $prompt_dir/$argv.fish
-                    if not set -q prompts[1]
-                        set prompts $prompt_dir/*.fish \
-                            (status list-files tools/web_config/sample_prompts/ 2>/dev/null)
+                    set -l prompts
+                    if set -q __fish_data_dir[1]
+                        set prompts $prompt_dir/$argv.fish
+                        if not set -q prompts[1]
+                            set prompts $prompt_dir/*.fish
+                        end
+                    else
+                        set prompts tools/web_config/sample_prompts/$argv.fish
+                        if not set -q prompts[1]
+                            set prompts (status list-files tools/web_config/sample_prompts/ 2>/dev/null)
+                        end
                     end
                     for p in $prompts
-                        if not test -e "$p"
-                            continue
+                        if set -q __fish_data_dir[1]
+                            if not test -e "$p"
+                                continue
+                            end
+                        else
+                            if not status get-file $p &>/dev/null
+                                continue
+                            end
                         end
                         set -l promptname (string replace -r '.*/([^/]*).fish$' '$1' $p)
                         echo -s (set_color --underline) $promptname (set_color normal)
@@ -247,7 +260,9 @@ function fish_config --description "Launch fish's web based configuration"
                 case show
                     set -l fish (status fish-path)
                     set -l themes $dirs/$argv.theme \
-                        (status list-files tools/web_config/themes/ 2>/dev/null | string match -- "*/"$argv.theme)
+                        (set -q argv[1] &&
+                            status list-files tools/web_config/themes/ 2>/dev/null |
+                            grep -Fx -e"tools/web_config/themes/"$argv.theme)
                     if not set -q themes[1]
                         set themes $dirs/*.theme (status list-files tools/web_config/themes/ 2>/dev/null)
                     end

tests/checks/fish_config.fish

@@ -1,3 +1,22 @@
  #RUN: %fish %s
 
 fish_config theme show non-existant-theme >/dev/null
+
+fish_config prompt show non-existant-prompt >/dev/null
+
+# TODO This shouldn't print terminal escape sequences when stdout is not a TTY..
+fish_config prompt show default
+# CHECK: {{\x1b\[4m}}default{{\x1b\[m}}
+# CHECK: {{.*}}@{{.*}}>{{.*}}
+
+fish_config theme show "fish default"
+# CHECK: {{\x1b\[m}}{{\x1b}}[4mCurrent{{\x1b\[m}}
+# CHECK: /bright/vixens{{\x1b\[m}} jump{{\x1b\[m}} |{{\x1b\[m}} "fowl"{{\x1b\[m}} > quack{{\x1b\[m}} &{{\x1b\[m}} # This is a comment
+# CHECK: {{\x1b}}[mecho{{\x1b\[m}} 'Errors are the portal to discovery
+# CHECK: {{\x1b}}[mTh{{\x1b}}[mis an autosuggestion
+
+fish_config theme show
+# CHECK: {{\x1b\[m}}{{\x1b}}[4mCurrent{{\x1b\[m}}
+# CHECK: /bright/vixens{{\x1b\[m}} jump{{\x1b\[m}} |{{\x1b\[m}} "fowl"{{\x1b\[m}} > quack{{\x1b\[m}} &{{\x1b\[m}} # This is a comment
+# CHECK: {{\x1b}}[mecho{{\x1b\[m}} 'Errors are the portal to discovery
+# CHECK: {{\x1b}}[mTh{{\x1b}}[mis an autosuggestion