lib.booleans: add yesNo function

Closes #2772

modules/lib/booleans.nix

@@ -0,0 +1,5 @@
+{ lib }: {
+  # Converts a boolean to a yes/no string. This is used in lots of
+  # configuration formats.
+  yesNo = value: if value then "yes" else "no";
+}

modules/lib/default.nix

@@ -18,6 +18,7 @@ rec {
 
   assertions = import ./assertions.nix { inherit lib; };
 
+  booleans = import ./booleans.nix { inherit lib; };
   gvariant = import ./gvariant.nix { inherit lib; };
   maintainers = import ./maintainers.nix;
   strings = import ./strings.nix { inherit lib; };

modules/programs/irssi.nix

@@ -6,7 +6,6 @@ let
 
   cfg = config.programs.irssi;
 
-  boolStr = b: if b then "yes" else "no";
   quoteStr = s: escape [ ''"'' ] s;
 
   # Comma followed by newline.
@@ -33,9 +32,9 @@ let
         chatnet = "${k}";
         address = "${v.server.address}";
         port = "${toString v.server.port}";
-        use_ssl = "${boolStr v.server.ssl.enable}";
+        use_ssl = "${lib.hm.booleans.yesNo v.server.ssl.enable}";
-        ssl_verify = "${boolStr v.server.ssl.verify}";
+        ssl_verify = "${lib.hm.booleans.yesNo v.server.ssl.verify}";
-        autoconnect = "${boolStr v.server.autoConnect}";
+        autoconnect = "${lib.hm.booleans.yesNo v.server.autoConnect}";
         ${
           lib.optionalString (v.server.ssl.certificateFile != null) ''
             ssl_cert = "${v.server.ssl.certificateFile}";
@@ -50,7 +49,7 @@ let
         {
           chatnet = "${k}";
           name = "${c}";
-          autojoin = "${boolStr cv.autoJoin}";
+          autojoin = "${lib.hm.booleans.yesNo cv.autoJoin}";
         }
       '')))));
 

modules/programs/kitty.nix

@@ -14,10 +14,8 @@ let
   toKittyConfig = generators.toKeyValue {
     mkKeyValue = key: value:
       let
-        value' = if isBool value then
+        value' =
-          (if value then "yes" else "no")
+          (if isBool value then lib.hm.booleans.yesNo else toString) value;
-        else
-          toString value;
       in "${key} ${value'}";
   };
 

modules/programs/mbsync.nix

@@ -63,7 +63,7 @@ let
         if isList v then
           concatMapStringsSep " " (genValue n) v
         else if isBool v then
-          (if v then "yes" else "no")
+          lib.hm.booleans.yesNo v
         else if isInt v then
           toString v
         else if isString v && hasSpace v then

modules/programs/mpv.nix

@@ -18,9 +18,7 @@ let
     rec {
       int = toString option;
       float = int;
-
+      bool = lib.hm.booleans.yesNo option;
-      bool = if option then "yes" else "no";
-
       string = option;
     }.${typeOf option};
 

modules/programs/ncmpcpp.nix

@@ -14,7 +14,7 @@ let
   renderValue = option:
     {
       int = toString option;
-      bool = if option then "yes" else "no";
+      bool = lib.hm.booleans.yesNo option;
       string = option;
     }.${builtins.typeOf option};
 

modules/programs/neomutt.nix

@@ -89,7 +89,6 @@ let
     };
   };
 
-  yesno = x: if x then "yes" else "no";
   setOption = n: v: if v == null then "unset ${n}" else "set ${n}=${v}";
   escape = replaceStrings [ "%" ] [ "%25" ];
 
@@ -167,7 +166,7 @@ let
   sidebarSection = ''
     # Sidebar
     set sidebar_visible = yes
-    set sidebar_short_path = ${yesno cfg.sidebar.shortPath}
+    set sidebar_short_path = ${lib.hm.booleans.yesNo cfg.sidebar.shortPath}
     set sidebar_width = ${toString cfg.sidebar.width}
     set sidebar_format = '${cfg.sidebar.format}'
   '';
@@ -204,8 +203,10 @@ let
 
       # GPG section
       set crypt_use_gpgme = yes
-      set crypt_autosign = ${yesno (gpg.signByDefault or false)}
+      set crypt_autosign = ${lib.hm.booleans.yesNo (gpg.signByDefault or false)}
-      set crypt_opportunistic_encrypt = ${yesno (gpg.encryptByDefault or false)}
+      set crypt_opportunistic_encrypt = ${
+        lib.hm.booleans.yesNo (gpg.encryptByDefault or false)
+      }
       set pgp_use_gpg_agent = yes
       set mbox_type = ${if maildir != null then "Maildir" else "mbox"}
       set sort = "${cfg.sort}"

modules/programs/newsboat.nix

@@ -24,7 +24,7 @@ let
     max-items ${toString cfg.maxItems}
     browser ${cfg.browser}
     reload-threads ${toString cfg.reloadThreads}
-    auto-reload ${if cfg.autoReload then "yes" else "no"}
+    auto-reload ${lib.hm.booleans.yesNo cfg.autoReload}
     ${optionalString (cfg.reloadTime != null)
     (toString "reload-time ${toString cfg.reloadTime}")}
     prepopulate-query-feeds yes

modules/programs/offlineimap.nix

@@ -12,10 +12,8 @@ let
   toIni = generators.toINI {
     mkKeyValue = key: value:
       let
-        value' = if isBool value then
+        value' =
-          (if value then "yes" else "no")
+          (if isBool value then lib.hm.booleans.yesNo else toString) value;
-        else
-          toString value;
       in "${key} = ${value'}";
   };
 

modules/programs/ssh.nix

@@ -13,8 +13,6 @@ let
     then " ${entry.address}"
     else " [${entry.address}]:${toString entry.port}";
 
-  yn = flag: if flag then "yes" else "no";
-
   unwords = builtins.concatStringsSep " ";
 
   bindOptions = {
@@ -284,7 +282,7 @@ let
   matchBlockStr = cf: concatStringsSep "\n" (
     ["Host ${cf.host}"]
     ++ optional (cf.port != null)            "  Port ${toString cf.port}"
-    ++ optional (cf.forwardAgent != null)    "  ForwardAgent ${yn cf.forwardAgent}"
+    ++ optional (cf.forwardAgent != null)    "  ForwardAgent ${lib.hm.booleans.yesNo cf.forwardAgent}"
     ++ optional cf.forwardX11                "  ForwardX11 yes"
     ++ optional cf.forwardX11Trusted         "  ForwardX11Trusted yes"
     ++ optional cf.identitiesOnly            "  IdentitiesOnly yes"
@@ -296,7 +294,7 @@ let
       "  ServerAliveInterval ${toString cf.serverAliveInterval}"
     ++ optional (cf.serverAliveCountMax != 3)
       "  ServerAliveCountMax ${toString cf.serverAliveCountMax}"
-    ++ optional (cf.compression != null)     "  Compression ${yn cf.compression}"
+    ++ optional (cf.compression != null)     "  Compression ${lib.hm.booleans.yesNo cf.compression}"
     ++ optional (!cf.checkHostIP)            "  CheckHostIP no"
     ++ optional (cf.proxyCommand != null)    "  ProxyCommand ${cf.proxyCommand}"
     ++ optional (cf.proxyJump != null)       "  ProxyJump ${cf.proxyJump}"
@@ -498,11 +496,11 @@ in
       )}
 
       Host *
-        ForwardAgent ${yn cfg.forwardAgent}
+        ForwardAgent ${lib.hm.booleans.yesNo cfg.forwardAgent}
-        Compression ${yn cfg.compression}
+        Compression ${lib.hm.booleans.yesNo cfg.compression}
         ServerAliveInterval ${toString cfg.serverAliveInterval}
         ServerAliveCountMax ${toString cfg.serverAliveCountMax}
-        HashKnownHosts ${yn cfg.hashKnownHosts}
+        HashKnownHosts ${lib.hm.booleans.yesNo cfg.hashKnownHosts}
         UserKnownHostsFile ${cfg.userKnownHostsFile}
         ControlMaster ${cfg.controlMaster}
         ControlPath ${cfg.controlPath}

modules/programs/zsh/prezto.nix

@@ -365,11 +365,11 @@ in {
       # Generated by Nix
       ${optionalString (cfg.caseSensitive != null) ''
         zstyle ':prezto:*:*' case-sensitive '${
-          if cfg.caseSensitive then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.caseSensitive
         }'
       ''}
       ${optionalString (cfg.color != null) ''
-        zstyle ':prezto:*:*' color '${if cfg.color then "yes" else "no"}'
+        zstyle ':prezto:*:*' color '${lib.hm.booleans.yesNo cfg.color}'
       ''}
       ${optionalString (cfg.pmoduleDirs != [ ]) ''
         zstyle ':prezto:load' pmodule-dirs ${
@@ -410,12 +410,12 @@ in {
       ''}
       ${optionalString (cfg.editor.dotExpansion != null) ''
         zstyle ':prezto:module:editor' dot-expansion '${
-          if cfg.editor.dotExpansion then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.editor.dotExpansion
         }'
       ''}
       ${optionalString (cfg.editor.promptContext != null) ''
         zstyle ':prezto:module:editor' ps-context '${
-          if cfg.editor.promptContext then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.editor.promptContext
         }'
       ''}
       ${optionalString (cfg.git.submoduleIgnore != null) ''
@@ -447,27 +447,27 @@ in {
       ''}
       ${optionalString (cfg.python.virtualenvAutoSwitch != null) ''
         zstyle ':prezto:module:python:virtualenv' auto-switch '${
-          if cfg.python.virtualenvAutoSwitch then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.python.virtualenvAutoSwitch
         }'
       ''}
       ${optionalString (cfg.python.virtualenvInitialize != null) ''
         zstyle ':prezto:module:python:virtualenv' initialize '${
-          if cfg.python.virtualenvInitialize then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.python.virtualenvInitialize
         }'
       ''}
       ${optionalString (cfg.ruby.chrubyAutoSwitch != null) ''
         zstyle ':prezto:module:ruby:chruby' auto-switch '${
-          if cfg.ruby.chrubyAutoSwitch then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.ruby.chrubyAutoSwitch
         }'
       ''}
       ${optionalString (cfg.screen.autoStartLocal != null) ''
         zstyle ':prezto:module:screen:auto-start' local '${
-          if cfg.screen.autoStartLocal then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.screen.autoStartLocal
         }'
       ''}
       ${optionalString (cfg.screen.autoStartRemote != null) ''
         zstyle ':prezto:module:screen:auto-start' remote '${
-          if cfg.screen.autoStartRemote then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.screen.autoStartRemote
         }'
       ''}
       ${optionalString (cfg.ssh.identities != [ ]) ''
@@ -502,7 +502,7 @@ in {
       ''}
       ${optionalString (cfg.terminal.autoTitle != null) ''
         zstyle ':prezto:module:terminal' auto-title '${
-          if cfg.terminal.autoTitle then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.terminal.autoTitle
         }'
       ''}
       ${optionalString (cfg.terminal.windowTitleFormat != null) ''
@@ -516,17 +516,17 @@ in {
       ''}
       ${optionalString (cfg.tmux.autoStartLocal != null) ''
         zstyle ':prezto:module:tmux:auto-start' local '${
-          if cfg.tmux.autoStartLocal then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.tmux.autoStartLocal
         }'
       ''}
       ${optionalString (cfg.tmux.autoStartRemote != null) ''
         zstyle ':prezto:module:tmux:auto-start' remote '${
-          if cfg.tmux.autoStartRemote then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.tmux.autoStartRemote
         }'
       ''}
       ${optionalString (cfg.tmux.itermIntegration != null) ''
         zstyle ':prezto:module:tmux:iterm' integrate '${
-          if cfg.tmux.itermIntegration then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.tmux.itermIntegration
         }'
       ''}
       ${optionalString (cfg.tmux.defaultSessionName != null) ''
@@ -534,7 +534,7 @@ in {
       ''}
       ${optionalString (cfg.utility.safeOps != null) ''
         zstyle ':prezto:module:utility' safe-ops '${
-          if cfg.utility.safeOps then "yes" else "no"
+          lib.hm.booleans.yesNo cfg.utility.safeOps
         }'
       ''}
       ${cfg.extraConfig}

modules/services/dunst.nix

@@ -13,7 +13,7 @@ let
     mkKeyValue = key: value:
       let
         value' = if isBool value then
-          (if value then "yes" else "no")
+          (lib.hm.booleans.yesNo value)
         else if isString value then
           ''"${value}"''
         else

modules/services/window-managers/i3-sway/i3.nix

@@ -161,13 +161,13 @@ let
         "floating_modifier ${floating.modifier}"
         (windowBorderString window floating)
         "hide_edge_borders ${window.hideEdgeBorders}"
-        "force_focus_wrapping ${if focus.forceWrapping then "yes" else "no"}"
+        "force_focus_wrapping ${lib.hm.booleans.yesNo focus.forceWrapping}"
-        "focus_follows_mouse ${if focus.followMouse then "yes" else "no"}"
+        "focus_follows_mouse ${lib.hm.booleans.yesNo focus.followMouse}"
         "focus_on_window_activation ${focus.newWindow}"
         "mouse_warping ${if focus.mouseWarping then "output" else "none"}"
         "workspace_layout ${workspaceLayout}"
         "workspace_auto_back_and_forth ${
-          if workspaceAutoBackAndForth then "yes" else "no"
+          lib.hm.booleans.yesNo workspaceAutoBackAndForth
         }"
         "client.focused ${colorSetStr colors.focused}"
         "client.focused_inactive ${colorSetStr colors.focusedInactive}"

modules/services/window-managers/i3-sway/lib/functions.nix

@@ -87,10 +87,10 @@ rec {
                 "status_command ${statusCommand}")
               "${moduleName}bar_command ${command}"
               (optionalString (workspaceButtons != null)
-                "workspace_buttons ${if workspaceButtons then "yes" else "no"}")
+                "workspace_buttons ${lib.hm.booleans.yesNo workspaceButtons}")
               (optionalString (workspaceNumbers != null)
                 "strip_workspace_numbers ${
-                  if !workspaceNumbers then "yes" else "no"
+                  lib.hm.booleans.yesNo (!workspaceNumbers)
                 }")
               (optionalString (trayOutput != null) "tray_output ${trayOutput}")
               (optionals colorsNotNull (indent

modules/services/window-managers/i3-sway/lib/options.nix

@@ -494,10 +494,7 @@ in {
           default = if isSway then "yes" else true;
           description = "Whether focus should follow the mouse.";
           apply = val:
-            if (isSway && isBool val) then
+            if (isSway && isBool val) then (lib.hm.booleans.yesNo val) else val;
-              (if val then "yes" else "no")
-            else
-              val;
         };
 
         forceWrapping = mkOption {

modules/services/window-managers/i3-sway/sway.nix

@@ -270,13 +270,13 @@ let
         "floating_modifier ${floating.modifier}"
         (windowBorderString window floating)
         "hide_edge_borders ${window.hideEdgeBorders}"
-        "focus_wrapping ${if focus.forceWrapping then "yes" else "no"}"
+        "focus_wrapping ${lib.hm.booleans.yesNo focus.forceWrapping}"
         "focus_follows_mouse ${focus.followMouse}"
         "focus_on_window_activation ${focus.newWindow}"
         "mouse_warping ${if focus.mouseWarping then "output" else "none"}"
         "workspace_layout ${workspaceLayout}"
         "workspace_auto_back_and_forth ${
-          if workspaceAutoBackAndForth then "yes" else "no"
+          lib.hm.booleans.yesNo workspaceAutoBackAndForth
         }"
         "client.focused ${colorSetStr colors.focused}"
         "client.focused_inactive ${colorSetStr colors.focusedInactive}"