replace starship with custom fish prompt

fish/files/functions/_prompt_config.fish

@@ -0,0 +1,57 @@
+# Prompt configuration
+
+function _prompt_config
+    # Colors
+    if not set -q prompt_color_surface; and not set -Uq prompt_color_surface
+        set -U prompt_color_surface 1b2122
+    end
+    if not set -q prompt_color_primary; and not set -Uq prompt_color_primary
+        set -U prompt_color_primary 81d3df
+    end
+    if not set -q prompt_color_secondary; and not set -Uq prompt_color_secondary
+        set -U prompt_color_secondary b1cbcf
+    end
+    if not set -q prompt_color_tertiary; and not set -Uq prompt_color_tertiary
+        set -U prompt_color_tertiary b9c6ea
+    end
+    if not set -q prompt_color_error; and not set -Uq prompt_color_error
+        set -U prompt_color_error ffb4ab
+    end
+    if not set -q prompt_color_primary_fixed; and not set -Uq prompt_color_primary_fixed
+        set -U prompt_color_primary_fixed 9df0fb
+    end
+    if not set -q prompt_color_tertiary_fixed; and not set -Uq prompt_color_tertiary_fixed
+        set -U prompt_color_tertiary_fixed d9e2ff
+    end
+
+    # Behavior
+    if not set -q prompt_show_username; and not set -Uq prompt_show_username
+        set -U prompt_show_username true
+    end
+    if not set -q prompt_show_time; and not set -Uq prompt_show_time
+        set -U prompt_show_time true
+    end
+    if not set -q prompt_time_format; and not set -Uq prompt_time_format
+        set -U prompt_time_format "%I:%M%P"
+    end
+    if not set -q prompt_dir_truncation; and not set -Uq prompt_dir_truncation
+        set -U prompt_dir_truncation 3
+    end
+
+    # Symbols
+    if not set -q prompt_symbol; and not set -Uq prompt_symbol
+        set -U prompt_symbol "󱞪"
+    end
+    if not set -q prompt_user_symbol; and not set -Uq prompt_user_symbol
+        set -U prompt_user_symbol "󰧱"
+    end
+
+    # Directory substitutions
+    if not set -q prompt_dir_substitutions; and not set -Uq prompt_dir_substitutions
+        set -U prompt_dir_substitutions \
+            "Documents:󰈙" \
+            "Downloads: " \
+            "Music: " \
+            "Pictures: "
+    end
+end