nara: configure fish

2 files changed, 87 insertions, 4 deletions

diff --git a/modules/mac/programs/default.nix b/modules/mac/programs/default.nix
index a1c7eed..eee7817 100644
--- a/modules/mac/programs/default.nix
+++ b/modules/mac/programs/default.nix
@@ -1,12 +1,10 @@
 {
   imports = [
     ./homebrew
+    ./fish.nix
     ./gnupg.nix
     ./vim.nix
   ];
 
-  programs = {
-    nix-index.enable = true;
-    fish.enable = true;
-  };
+  programs.nix-index.enable = true;
 }
diff --git a/modules/mac/programs/fish.nix b/modules/mac/programs/fish.nix
new file mode 100644
index 0000000..50bc837
--- /dev/null
+++ b/modules/mac/programs/fish.nix
@@ -0,0 +1,85 @@
+{
+  programs.fish = {
+    enable = true;
+    shellInit = "set -g fish_greeting";
+
+    # https://github.com/arbourd/prompt
+    promptInit = ''
+      function fish_prompt -d "Prints left prompt"
+        set -l last_status  $status
+        set -l glyph        "\$"
+        set -l glyph_color  (set_color normal)
+        set -l pwd          (prompt_pwd)
+        set -l pwd_color    (set_color blue)
+
+        if test (id -u "$USER") -eq 0
+          set glyph "#"
+        end
+
+        if test "$last_status" -ne 0
+          set pwd_color (set_color red)
+        end
+
+        if command git rev-parse --git-dir > /dev/null 2>/dev/null
+          if ! command git diff --cached --no-ext-diff --quiet --exit-code 2>/dev/null
+            set glyph_color (set_color green)
+          else if command git rev-parse --verify --quiet refs/stash > /dev/null 2>/dev/null
+            set glyph_color (set_color yellow)
+          end
+        end
+
+        printf "$pwd_color$pwd $glyph_color$glyph "
+      end
+
+      function fish_right_prompt -d "Prints right prompt"
+        function __git_branch_name
+          command git symbolic-ref --short HEAD 2>/dev/null \
+            || command git describe --tags --exact-match HEAD 2>/dev/null \
+            || command git rev-parse --short HEAD 2>/dev/null
+        end
+
+        function __git_changed
+          ! command git diff-index --quiet HEAD 2>/dev/null \
+            || count (command git ls-files --others --exclude-standard) >/dev/null
+        end
+
+        function __git_modified_files
+          count (command git status --porcelain --ignore-submodules 2>/dev/null)
+        end
+
+        function __git_symbol
+          command git rev-list --count --left-right @{upstream}...@ 2>/dev/null | read behind ahead
+
+          switch "$behind $ahead"
+            case " " "0 0"
+            case "0 *"
+              printf " ↑"
+            case "* 0"
+              printf " ↓"
+            case "*"
+              printf " ⥄"
+          end
+        end
+
+        if set branch_name (__git_branch_name)
+          set -l git_symbol (__git_symbol)
+          set -l git_color
+          set -l git_modified_files (__git_modified_files)
+          set -l git_changed_files
+
+          if __git_changed
+            set git_color (set_color red)
+          else
+            set git_color (set_color cyan)
+          end
+
+          if test "$git_modified_files" -gt 0
+            set git_changed_files (set_color yellow)"$git_modified_files changed "
+          end
+
+          printf "$git_changed_files$git_color$branch_name$git_symbol"
+        end
+      end
+    '';
+  };
+}