feat(zsh): starship prompt

modules/cli/shell/zsh.nix

@@ -36,6 +36,50 @@ lib.my.makeSwitch {
           fzf
           zoxide
         ];
+        programs.starship = {
+          enable = true;
+          settings = lib.recursiveUpdate (with builtins; fromTOML (readFile ./starship-preset.toml)) {
+            add_newline = false;
+            custom = {
+              jj = {
+                ignore_timeout = true;
+                description = "The current jj status";
+                detect_folders = [ ".jj" ];
+                symbol = " ";
+                command = ''
+                  jj log --revisions @ --no-graph --ignore-working-copy --color always --limit 1 --template '
+                    separate(" ",
+                      change_id.shortest(4),
+                      bookmarks,
+                      "|",
+                      concat(
+                        if(conflict, "💥"),
+                        if(divergent, "🚧"),
+                        if(hidden, "👻"),
+                        if(immutable, "🔒"),
+                      ),
+                      raw_escape_sequence("\x1b[1;32m") ++ if(empty, "(empty)"),
+                      raw_escape_sequence("\x1b[1;32m") ++ coalesce(
+                        truncate_end(29, description.first_line(), "…"),
+                        "(no description set)",
+                      ) ++ raw_escape_sequence("\x1b[0m"),
+                    )
+                  '
+                '';
+              };
+              git_branch = {
+                when = true;
+                command = "jj root >/dev/null 2>&1 || starship module git_branch";
+                description = "Only show git_branch if we're not in a jj repo";
+              };
+            };
+            git_state.disabled = true;
+            git_commit.disabled = true;
+            git_metrics.disabled = true;
+            git_branch.disabled = true;
+            nix_shell.disabled = true;
+          };
+        };
         programs.zsh = {
           enable = true;
           dotDir = ".config/zsh";