Use set -l to force use of a local variable

Bare set overwrites a global/universal variable if it exists.

share/tools/web_config/sample_prompts/acidhub.fish

@@ -2,10 +2,12 @@
 # author: Acidhub - https://acidhub.click/
 
 function fish_prompt -d "Write out the prompt"
-    set laststatus $status
+    set -l laststatus $status
 
+    set -l git_info
     if set -l git_branch (command git symbolic-ref HEAD 2>/dev/null | string replace refs/heads/ '')
         set git_branch (set_color -o blue)"$git_branch"
+        set -l git_status
         if command git diff-index --quiet HEAD --
             if set -l count (command git rev-list --count --left-right $upstream...HEAD 2>/dev/null)
                 echo $count | read -l ahead behind

share/tools/web_config/sample_prompts/debian_chroot.fish

@@ -3,12 +3,13 @@
 
 function fish_prompt --description 'Write out the prompt, prepending the Debian chroot environment if present'
     # Set variable identifying the chroot you work in (used in the prompt below)
-    if not set -q debian_chroot
+    set -l debian_chroot $debian_chroot
+    if not set -q debian_chroot[1]
         and test -r /etc/debian_chroot
         set debian_chroot (cat /etc/debian_chroot)
     end
     if not set -q __fish_debian_chroot_prompt
-        and set -q debian_chroot
+        and set -q debian_chroot[1]
         and test -n "$debian_chroot"
         set -g __fish_debian_chroot_prompt "($debian_chroot)"
     end

share/tools/web_config/sample_prompts/nim.fish

@@ -32,8 +32,8 @@ function fish_prompt
 
     function _nim_prompt_wrapper
         set retc $argv[1]
-        set field_name $argv[2]
-        set field_value $argv[3]
+        set -l field_name $argv[2]
+        set -l field_value $argv[3]
 
         set_color normal
         set_color $retc
@@ -107,7 +107,7 @@ function fish_prompt
     and _nim_prompt_wrapper $retc V (basename "$VIRTUAL_ENV")
 
     # git
-    set prompt_git (fish_git_prompt | string trim -c ' ()')
+    set -l prompt_git (fish_git_prompt | string trim -c ' ()')
     test -n "$prompt_git"
     and _nim_prompt_wrapper $retc G $prompt_git
 

share/tools/web_config/sample_prompts/robbyrussell.fish

@@ -76,6 +76,7 @@ function fish_prompt
 
     set -l cwd $cyan(basename (prompt_pwd))
 
+    set -l repo_info
     if set -l repo_type (_repo_type)
         set -l repo_branch $red(_repo_branch_name $repo_type)
         set repo_info "$blue $repo_type:($repo_branch$blue)"