crea shenvs, añade infrastructura para paquetes

flake.nix

@@ -23,5 +23,7 @@
       homeDirectory = "/home/fabian";
       stateVersion = "21.11";
     };
+
+    packages.x86_64-linux = import ./pkgs nixpkgs.legacyPackages.x86_64-linux;
   };
 }

home/zshrc.nix

@@ -76,7 +76,6 @@
   alias x='killall --ignore-case --user=$(whoami) --interactive'
   alias sc='${maim}/bin/maim -s -u | xclip -selection clipboard -t image/png -i'
   alias tree='tree -CF'
-  alias spawn="xdg-open"
   alias lock="betterlockscreen -l"
   alias nightmode="${redshift}/bin/redshift -P -O 1000"
   alias lightmode="${redshift}/bin/redshift -P -O 6500"
@@ -85,7 +84,22 @@
   bindkey ";5D" backward-word
   bindkey ";5C" forward-word
   bindkey "\e[3~" delete-char
-  
+
+
+  function shenv() {
+    nix shell 'system#shenvs.'"$1"
+  }
+
+  function spawn () {
+    if [ ! -x "$(command -v $1)" ]
+      then
+         echo "spawn: no such program: $1" >&2
+         return 1
+     fi
+     $@ > /dev/null 0>&1 2>&1 &
+     disown
+  }
+
   autoload -Uz up-line-or-beginning-search
   zle -N up-line-or-beginning-search
   autoload -Uz down-line-or-beginning-search

pkgs/default.nix

@@ -0,0 +1,32 @@
+pkgs:
+with pkgs.lib; let
+  inherit (pkgs) buildEnv callPackage writeTextDir;
+
+  importAll = { root, exclude ? [] }:
+
+    # adapted from http://chriswarbo.net/projects/nixos/useful_hacks.html
+    let
+      basename = removeSuffix ".nix";
+
+      isMatch = name: type: (hasSuffix ".nix" name || type == "directory")
+                         && ! elem name (map basename exclude);
+
+      entry = name: _: {
+        name = basename name;
+        value = import (root + "/${name}");
+      };
+    in
+      mapAttrs' entry (filterAttrs isMatch (readDir root))
+
+in {
+  shenvs = let
+    build = name: { paths, enter ? null }: buildEnv {
+      name = "shenv-${name}";
+      paths = (optional (enter != null) (writeTextDir "lib/shenv/enter" enter))
+            ++ paths;
+    };
+  in mapAttrs (name: shenv: build name (shenv pkgs)) (importAll {
+    root = ../shenvs;
+    exclude = [ "config" ];
+  });
+}

result

@@ -1 +0,0 @@
-/nix/store/8by51srkm9s1rfiqlsp4n6fznm7bjzqb-home-manager-generation

shenvs/armasm.nix

@@ -0,0 +1,5 @@
+pkgs: {
+  paths = with pkgs; [
+    gcc-arm-embedded
+  ];
+}