WIP: ADD NOTE FOR FUTURE SELF

Same reason as `ui.diff-editor`.

hosts/homes/ambroisie@bazin/default.nix

@@ -22,6 +22,10 @@
       package = pkgs.emptyDirectory;
     };
 
+    jujutsu = {
+      package = pkgs.emptyDirectory;
+    };
+
     tmux = {
       # I use scripts that use the passthrough sequence often on this host
       enablePassthrough = true;

hosts/homes/ambroisie@mousqueton/default.nix

@@ -25,6 +25,10 @@
       package = pkgs.emptyDirectory;
     };
 
+    jujutsu = {
+      package = pkgs.emptyDirectory;
+    };
+
     tmux = {
       # I use scripts that use the passthrough sequence often on this host
       enablePassthrough = true;

modules/home/default.nix

@@ -24,6 +24,7 @@
     ./gtk
     ./htop
     ./jq
+    ./jujutsu
     ./keyboard
     ./mail
     ./mpv

modules/home/delta/default.nix

@@ -11,6 +11,10 @@ in
     git = {
       enable = my.mkDisableOption "git integration";
     };
+
+    jujutsu = {
+      enable = my.mkDisableOption "jujutsu integration";
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -20,6 +24,9 @@ in
       inherit (cfg) package;
 
       enableGitIntegration = cfg.git.enable;
+      # `jj log -p` does not use `delta`
+      # https://github.com/jj-vcs/jj/issues/4142
+      enableJujutsuIntegration = cfg.jujutsu.enable;
 
       options = {
         features = "diff-highlight decorations";

modules/home/jujutsu/default.nix

@@ -0,0 +1,137 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.my.home.jujutsu;
+
+  inherit (lib.my) mkMailAddress;
+in
+{
+  options.my.home.jujutsu = with lib; {
+    enable = my.mkDisableOption "jujutsu configuration";
+
+    package = mkPackageOption pkgs "jujutsu" { };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        # For `jj git` commands
+        assertion = cfg.enable -> config.my.home.git.enable;
+        message = ''
+          `config.my.home.jujutsu` relies on `config.my.home.git` being enabled.
+        '';
+      }
+    ];
+
+    programs.jujutsu = {
+      enable = true;
+
+      inherit (cfg) package;
+
+      settings = {
+        # Who am I?
+        user = {
+          name = "Bruno BELANYI";
+          email = mkMailAddress "bruno" "belanyi.fr";
+        };
+
+        aliases = {
+          jj = [ ];
+          # FIXME:
+          # * still not a big fan of the template
+          lol = [ "log" "-r" "..@" "-T" "builtin_log_oneline" ];
+          lola = [ "lol" "-r" "all()" ];
+          # FIXME: equivalent to `git switch -`
+          # See https://github.com/jj-vcs/jj/issues/2871
+          # Might be broken recently https://discord.com/channels/968932220549103686/1380272574709366989/1380432041983606855
+          # TODO:
+          # * `pick` (https://github.com/jj-vcs/jj/issues/5446): [ "util" "exec" "--" "bash" "-c" "jj log -p -r \"diff_contains($1)\"" "" ]
+          # * `root`: `jj workspace root` (barely necessary then)
+        };
+
+        ui = {
+          # Stop nagging me about it, though I am not a fan of its UI.
+          diff-editor = ":builtin";
+          # Stop nagging me about it, though I am not a fan of its UI.
+          merge-editor = ":builtin";
+        };
+
+        # FIXME: git equivalents
+        # I'd like a better formatted blame (more like delta's?)
+        # blame = {
+        #   coloring = "repeatedLines";
+        #   markIgnoredLines = true;
+        #   markUnblamables = true;
+        # };
+        # FIXME: log colors should probably match git
+        # FIXME: patience diff?
+        # FIXME: fetch prune/pruneTags?
+        # FIXME: pull.rebase=true? Probably true TBH
+        # FIXME: push.default=simple? Probably true TBH
+        # FIXME: conflict style? ui.conflict-marker-style=git is diff3, not zdiff3. Default looks fine-ish
+
+        # FIXME: from ma_9's config, plus my own stuff
+        # snapshot = {
+        #   auto-track = "none()";
+        # };
+        #
+        # ui = {
+        #   movement = {
+        #     edit = false;
+        #   };
+        # };
+
+        templates = {
+          # Equivalent to `commit.verbose = true` in Git
+          draft_commit_description = "commit_description_verbose(self)";
+        };
+
+        template-aliases = {
+          "commit_description_verbose(commit)" = ''
+            concat(
+              commit_description(commit),
+              "JJ: ignore-rest\n",
+              diff.git(),
+            )
+          '';
+          # FIXME: use `diff.summary()` instead? Supported by syntax highlighting
+          # See https://github.com/jj-vcs/jj/issues/1946#issuecomment-2572986485
+          # FIXME: tree-sitter grammar isn't in `nvim-treesitter` (https://github.com/kareigu/tree-sitter-jjdescription)
+          "commit_description(commit)" = ''
+            concat(
+              commit.description(), "\n",
+              "JJ: This commit contains the following changes:\n",
+              indent("JJ:    ", diff.stat(72)),
+            )
+          '';
+        };
+
+        "--scope" = [
+          # Multiple identities
+          {
+            "--when" = {
+              repositories = [ "~/git/EPITA/" ];
+            };
+            user = {
+              name = "Bruno BELANYI";
+              email = mkMailAddress "bruno.belanyi" "epita.fr";
+            };
+          }
+          {
+            "--when" = {
+              repositories = [ "~/git/work/" ];
+            };
+            user = {
+              name = "Bruno BELANYI";
+              email = mkMailAddress "ambroisie" "google.com";
+            };
+          }
+        ];
+      };
+    };
+
+    # To drop in a `local.toml` configuration, not-versioned
+    xdg.configFile = {
+      "jj/conf.d/.keep".text = "";
+    };
+  };
+}

pkgs/diff-flake/diff-flake

@@ -24,11 +24,15 @@ current_system() {
     nix eval --raw --impure --expr 'builtins.currentSystem'
 }
 
+add_darwin() {
+    FLAKE_OUTPUTS+=("darwinConfigurations.\"$1\".config.system.build.toplevel")
+}
+
 add_home() {
     FLAKE_OUTPUTS+=("homeConfigurations.\"$1\".activationPackage")
 }
 
-add_host() {
+add_nixos() {
     FLAKE_OUTPUTS+=("nixosConfigurations.\"$1\".config.system.build.toplevel")
 }
 
@@ -37,6 +41,10 @@ add_shell() {
     FLAKE_OUTPUTS+=("devShells.\"$(current_system)\".\"$1\".inputDerivation")
 }
 
+add_system() {
+    FLAKE_OUTPUTS+=("systemConfigs.\"$1\".config.system.build.toplevel")
+}
+
 usage() {
     print_err "Usage: $0 [option]... [-- [nix build option]...]"
     print_err ""
@@ -54,11 +62,15 @@ usage() {
     print_err "  -p, --previous-rev"
     print_err "    which git revision should be considered the 'previous' state,"
     print_err "    defaults to HEAD~"
+    print_err "  --darwin [name]"
+    print_err "    specify the name of a nix-darwin output configuration whose"
+    print_err "    closure should be diffed, can be used multiple times"
+    print_err "    if no host name is given, defaults to current hostname"
     print_err "  --home [name]"
     print_err "    specify the name of a home-manager output configuration whose"
     print_err "    closure should be diffed, can be used multiple times"
     print_err "    if no configuration name is given, defaults to current username"
-    print_err "  --host [name]"
+    print_err "  --nixos [name]"
     print_err "    specify the name of a NixOS output configuration whose"
     print_err "    closure should be diffed, can be used multiple times"
     print_err "    if no host name is given, defaults to current hostname"
@@ -66,6 +78,10 @@ usage() {
     print_err "    specify a specific devShell configuration name whose closure"
     print_err "    should be diffed, can be used multiple times"
     print_err "    if no name is given, defaults to 'default'"
+    print_err "  --system [name]"
+    print_err "    specify the name of a system-manager output configuration whose"
+    print_err "    closure should be diffed, can be used multiple times"
+    print_err "    if no host name is given, defaults to current hostname"
     print_err ""
     print_err "when no flake outputs are specified, automatically queries for"
     print_err "all NixOS configurations, and devShells for current system"
@@ -101,6 +117,14 @@ parse_args() {
                 PREVIOUS_REV="$(git rev-parse "$1")"
                 shift
                 ;;
+            --darwin)
+                if [ $# -gt 0 ] && ! is_option "$1"; then
+                    add_darwin "$1"
+                    shift
+                else
+                    add_darwin "$(hostname)"
+                fi
+                ;;
             --home)
                 if [ $# -gt 0 ] && ! is_option "$1"; then
                     add_home "$1"
@@ -109,12 +133,12 @@ parse_args() {
                     add_home "$USER"
                 fi
                 ;;
-            --host)
+            --nixos)
                 if [ $# -gt 0 ] && ! is_option "$1"; then
-                    add_host "$1"
+                    add_nixos "$1"
                     shift
                 else
-                    add_host "$(hostname)"
+                    add_nixos "$(hostname)"
                 fi
                 ;;
             --shell)
@@ -125,6 +149,14 @@ parse_args() {
                     add_shell "default"
                 fi
                 ;;
+            --system)
+                if [ $# -gt 0 ] && ! is_option "$1"; then
+                    add_system "$1"
+                    shift
+                else
+                    add_system "$(hostname)"
+                fi
+                ;;
             --)
                 NIX_BUILD_ARGS=("$@")
                 break
@@ -138,6 +170,12 @@ parse_args() {
     done
 }
 
+list_darwin_configurations() {
+    nix eval '.#darwinConfigurations' \
+        --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
+        --raw
+}
+
 list_home_configurations() {
     nix eval '.#homeConfigurations' \
         --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
@@ -156,6 +194,12 @@ list_dev_shells() {
         --raw
 }
 
+list_system_configurations() {
+    nix eval '.#systemConfigs' \
+        --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
+        --raw
+}
+
 diff_output() {
     local PREV NEW
     PREV="$(mktemp --dry-run)"
@@ -175,15 +219,21 @@ diff_output() {
 parse_args "$@"
 
 if [ "${#FLAKE_OUTPUTS[@]}" -eq 0 ]; then
+    for darwin in $(list_darwin_configurations); do
+        add_darwin "$darwin"
+    done
     for home in $(list_home_configurations); do
         add_home "$home"
     done
-    for host in $(list_nixos_configurations); do
-        add_host "$host"
+    for nixos in $(list_nixos_configurations); do
+        add_nixos "$nixos"
     done
     for shell in $(list_dev_shells); do
         add_shell "$shell"
     done
+    for system in $(list_system_configurations); do
+        add_system "$system"
+    done
 fi
 
 for out in "${FLAKE_OUTPUTS[@]}"; do