Make script POSIX compliant

.config/shell/profile

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # Default programs:
 export BROWSER=firefox
@@ -30,90 +30,103 @@ export NVM_DIR="$XDG_CONFIG_HOME/nvm"
 export NUGET_PACKAGES="$XDG_DATA_HOME/nuget"
 
 # Color man pages:
-export LESS=-r
-export LESS_TERMCAP_mb=$'\E[01;32m'
-export LESS_TERMCAP_md=$'\E[01;32m'
-export LESS_TERMCAP_me=$'\E[0m'
-export LESS_TERMCAP_se=$'\E[0m'
-export LESS_TERMCAP_so=$'\E[01;47;34m'
-export LESS_TERMCAP_ue=$'\E[0m'
-export LESS_TERMCAP_us=$'\E[01;36m'
+export LESS='-r'
+export LESS_TERMCAP_mb
+export LESS_TERMCAP_md
+export LESS_TERMCAP_me
+export LESS_TERMCAP_se
+export LESS_TERMCAP_so
+export LESS_TERMCAP_ue
+export LESS_TERMCAP_us
+LESS_TERMCAP_mb="$(printf '\033[01;32m')"
+LESS_TERMCAP_md="$(printf '\033[01;32m')"
+LESS_TERMCAP_me="$(printf '\033[0m')"
+LESS_TERMCAP_se="$(printf '\033[0m')"
+LESS_TERMCAP_so="$(printf '\033[01;47;34m')"
+LESS_TERMCAP_ue="$(printf '\033[0m')"
+LESS_TERMCAP_us="$(printf '\033[01;36m')"
 
 # Other program settings:
 export DISPLAY_DPI=96
 
-# Remove an entry from PATH
-rm_path_entry() {
-    local shell="${SHELL##*/}" rm_entry="${1:?Entry not set}" new_path path_arr
+_tr="$(which tr 2>/dev/null || echo /usr/bin/tr)"
+_sed="$(which sed 2>/dev/null || echo /usr/bin/sed)"
 
-    if [[ "$shell" == "zsh" ]]; then
-        IFS=" " read -A path_arr <<<"${PATH//:/ }"
-    else
-        IFS=" " read -a path_arr <<<"${PATH//:/ }"
-    fi
-
-    for path_entry in "${path_arr[@]}"; do
-        grep -Eq "^$rm_entry$" <<<"$path_entry" && continue
-        new_path="$new_path:$path_entry"
-    done
-
-    PATH="${new_path#:}"
+# Trims the specified leading and trailing characters from the string
+trim() {
+    string="${1:?Missing string}"
+    char="${2:?Missing trim character}"
+    echo "$string" | $_sed "s/^$char*//; s/$char*$//"
 }
 
-# Remove one or more entries from PATH
-rm_path_entries() {
-    local rm_entry
+rm_env_path_entry() {
+    src_entries="${1:?Missing source entries}"
+    del_entry="${2:?Missing entry to delete}"
+    new_entries=""
 
-    for rm_entry in "$@"; do
-        rm_path_entry "$rm_entry"
-    done
-}
-
-# Prepend one or more entries to PATH.
-# The order of the supplied args will be kept, e.g. PATH="$1:$2:$PATH"
-prepend_path_with_entries() {
-    local addl_paths entry
-
-    for entry in "$@"; do
-        ! [ -d "$entry" ] && continue
-        addl_paths="$addl_paths:$entry"
+    echo "$src_entries" | $_tr ':' '\n' | while read -r entry; do
+        if [ "$entry" != "$del_entry" ]; then
+            new_entries="$new_entries:$entry"
+        fi
     done
 
-    PATH="${addl_paths#:}:$PATH"
+    trim "$new_entries" ":"
 }
 
-# Append one or more entries to PATH.
-# The order of the supplied args will be kept, e.g. PATH="$PATH:$1:$2"
-append_path_with_entries() {
-    local addl_paths entry
+modify_env_path() {
+    mode="${1:?Missing mode}"
+    entries="${2:?Missing entries}"
+    change="${3:?Missing change}"
 
-    for entry in "$@"; do
-        ! [ -d "$entry" ] && continue
-        addl_paths="$addl_paths:$entry"
-    done
+    entries="$(trim "$entries" ":")"
 
-    PATH="$PATH:${addl_paths#:}"
+    case "$mode" in
+    prepend)
+        temp_entries="" # Will hold the new entries in the correct order
+        echo "$change" | $_tr ':' '\n' | while read -r entry; do
+            [ -z "$entry" ] && continue # Skip empty entries
+            [ -d "$entry" ] || continue # Skip non-existent directories
+            temp_entries="$temp_entries:$entry"
+        done
+
+        # Merge the added entries to the existing entries
+        # Trim the leading colon and append the new entries
+        entries="${temp_entries#:}:$entries"
+        ;;
+    append)
+        echo "$change" | $_tr ':' '\n' | while read -r entry; do
+            [ -z "$entry" ] && continue # Skip empty entries
+            [ -d "$entry" ] || continue # Skip non-existent directories
+            entries="$entries:$entry"
+        done
+        ;;
+    delete)
+        echo "$change" | $_tr ':' '\n' | while read -r entry; do
+            [ -z "$entry" ] && continue # Skip empty entries
+            entries=$(rm_env_path_entry "$entries" "$entry")
+        done
+        ;;
+    *)
+        echo "Invalid mode: $mode (choose 'append', 'prepend', 'delete')" >&2
+        return 1
+        ;;
+    esac
+
+    trim "$entries" ":"
 }
 
-prepend_paths=(
-    "$HOME/.local/bin"
-    "$HOME/.cargo/bin"
-    "$FLUTTER_HOME/bin"
-    "$GOPATH/bin"
-    "$KREW_ROOT/bin"
-)
-append_paths=()
+prepend_paths="$HOME/.local/bin:$HOME/.cargo/bin:$FLUTTER_HOME/bin:$GOPATH/bin:$KREW_ROOT/bin"
 
 HOMEBREW_PREFIX="$XDG_DATA_HOME/homebrew"
 if [ -x "$HOMEBREW_PREFIX/bin/brew" ]; then
     eval "$("$HOMEBREW_PREFIX/bin/brew" shellenv)"
-    prepend_paths+=("$HOMEBREW_PREFIX/bin" "$HOMEBREW_PREFIX/sbin")
+    prepend_paths="$HOMEBREW_PREFIX/bin:$HOMEBREW_PREFIX/sbin:$prepend_paths"
 fi
 
-rm_path_entries "${prepend_paths[@]}" "${append_paths[@]}" # Ensure we clean up first
-prepend_path_with_entries "${prepend_paths[@]}"
-append_path_with_entries "${append_paths[@]}"
+PATH="$(modify_env_path delete "$PATH" "$prepend_paths")"
+PATH="$(modify_env_path prepend "$PATH" "$prepend_paths")"
+
 
 # Add the profile-extras file yourself if you wish to override anything:
 PROFILE_EXTRAS="$XDG_CONFIG_HOME/shell/profile-extras"
-[ -f "$PROFILE_EXTRAS" ] && . "$PROFILE_EXTRAS"
+[ -f "$PROFILE_EXTRAS" ] && . "$PROFILE_EXTRAS" || true