shell.nix: split zsh to zsh.nix

modules/zsh.nix

@@ -0,0 +1,53 @@
+{ pkgs }:
+{
+  users.defaultUserShell = pkgs.zsh;
+  programs = {
+    zsh = {
+      enable = true;
+      autosuggestions.enable = true;
+      syntaxHighlighting.enable = true;
+      histSize = 20000;
+      histFile = "$HOME/.cache/zsh_history";
+      interactiveShellInit = ''
+          ### zsh-history-substring-search ###
+          setopt HIST_IGNORE_ALL_DUPS
+          source ${pkgs.zsh-history-substring-search}/share/zsh-history-substring-search/zsh-history-substring-search.zsh
+          bindkey '^[[A' history-substring-search-up
+          bindkey '^[[B' history-substring-search-down
+          ### fzf-tab ###
+          source ${pkgs.zsh-fzf-tab}/share/fzf-tab/fzf-tab.plugin.zsh
+          ### transient shell prompt ###
+          zle-line-init() {
+          emulate -L zsh
+
+          [[ $CONTEXT == start ]] || return 0
+
+          while true; do
+            zle .recursive-edit
+            local -i ret=$?
+           [[ $ret == 0 && $KEYS == $'\4' ]] || break
+           [[ -o ignore_eof ]] || exit 0
+          done
+
+         local saved_prompt=$PROMPT
+          local saved_rprompt=$RPROMPT
+          PROMPT='\$ '
+          RPROMPT='''
+          zle .reset-prompt
+          PROMPT=$saved_prompt
+          RPROMPT=$saved_rprompt
+
+          if (( ret )); then
+            zle .send-break
+          else
+            zle .accept-line
+          fi
+          return ret
+        }
+
+        zle -N zle-line-init
+      '';
+    };
+
+  };
+}