Add option for specifying shell aliases, environment.shellAliases.

modules/module-list.nix

@@ -39,6 +39,7 @@
   ./programs/blcr.nix
   ./programs/info.nix
   ./programs/shadow.nix
+  ./programs/shell.nix
   ./programs/ssh.nix
   ./programs/ssmtp.nix
   ./programs/wvdial.nix

modules/programs/bash/bash.nix

@@ -25,6 +25,9 @@ let
     fi
   '';
 
+  shellAliases = concatStringsSep "\n" (
+    mapAttrsFlatten (k: v: "alias ${k}='${v}'") config.environment.shellAliases
+  );
 
   options = {
 
@@ -63,11 +66,11 @@ in
       { # /etc/bashrc: executed every time a bash starts. Sources
         # /etc/profile to ensure that the system environment is
         # configured properly.
-         source = pkgs.substituteAll {
-           src = ./bashrc.sh;
-           inherit initBashCompletion;
-         };
-         target = "bashrc";
+        source = pkgs.substituteAll {
+          src = ./bashrc.sh;
+          inherit initBashCompletion shellAliases;
+        };
+        target = "bashrc";
       }
 
       { # Configuration for readline in bash.
@@ -76,6 +79,13 @@ in
       }
     ];
 
+  environment.shellAliases = {
+    ls = "ls --color=tty";
+    ll = "ls -l";
+    l = "ls -alh";
+    which = "type -P";
+  };
+
   system.build.binsh = pkgs.bashInteractive;
 
   system.activationScripts.binsh = stringAfter [ "stdio" ]

modules/programs/bash/bashrc.sh

@@ -29,8 +29,4 @@ fi
 
 @initBashCompletion@
 
-# Some aliases.
-alias ls="ls --color=tty"
-alias ll="ls -l"
-alias l="ls -alh"
-alias which="type -P"
+@shellAliases@

modules/programs/shell.nix

@@ -0,0 +1,25 @@
+# This module defines global configuration for the shells.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+{
+  options = {
+    environment.shellAliases = mkOption {
+      type = types.attrs; # types.attrsOf types.stringOrPath;
+      default = {};
+      example = {
+        ll = "ls -lh";
+      };
+      description = ''
+        An attribute set that maps aliases (the top level attribute names in
+        this option) to command strings or directly to build outputs. The
+        aliases are added to all users' shells.
+      '';
+    };
+  };
+
+  config = {
+  };
+}