add fzf history keybindings for zsh

2 files changed, 42 insertions, 21 deletions

diff --git a/modules/programs/zsh.nix b/modules/programs/zsh/default.nix
index 7f33bf4..688064b 100644
--- a/modules/programs/zsh.nix
+++ b/modules/programs/zsh/default.nix
@@ -26,9 +26,7 @@ in
     programs.zsh.enable = mkOption {
       type = types.bool;
       default = false;
-      description = ''
-        Whether to configure zsh as an interactive shell.
-      '';
+      description = "Whether to configure zsh as an interactive shell.";
     };
 
     programs.zsh.variables = mkOption {
@@ -47,49 +45,43 @@ in
     programs.zsh.shellInit = mkOption {
       type = types.lines;
       default = "";
-      description = ''
-        Shell script code called during zsh shell initialisation.
-      '';
+      description = "Shell script code called during zsh shell initialisation.";
     };
 
     programs.zsh.loginShellInit = mkOption {
       type = types.lines;
       default = "";
-      description = ''
-        Shell script code called during zsh login shell initialisation.
-      '';
+      description = "Shell script code called during zsh login shell initialisation.";
     };
 
     programs.zsh.interactiveShellInit = mkOption {
       type = types.lines;
       default = "";
-      description = ''
-        Shell script code called during interactive zsh shell initialisation.
-      '';
+      description = "Shell script code called during interactive zsh shell initialisation.";
     };
 
     programs.zsh.promptInit = mkOption {
       type = types.lines;
       default = "autoload -U promptinit && promptinit && prompt walters";
-      description = ''
-        Shell script code used to initialise the zsh prompt.
-      '';
+      description = "Shell script code used to initialise the zsh prompt.";
     };
 
     programs.zsh.enableCompletion = mkOption {
       type = types.bool;
       default = true;
-      description = ''
-        Enable zsh completion for all interactive zsh shells.
-      '';
+      description = "Enable zsh completion for all interactive zsh shells.";
     };
 
     programs.zsh.enableBashCompletion = mkOption {
       type = types.bool;
       default = true;
-      description = ''
-        Enable bash completion for all interactive zsh shells.
-      '';
+      description = "Enable bash completion for all interactive zsh shells.";
+    };
+
+    programs.zsh.enableFzfHistory = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Enable fzf keybinding for Ctrl-r history search.";
     };
 
   };
@@ -144,6 +136,7 @@ in
       # This file is read for interactive shells.
 
       bindkey -e
+      ${optionalString cfg.enableFzfHistory "source ${./fzf-history.zsh}"}
 
       # Only execute this file once per shell.
       if [ -n "$__ETC_ZSHRC_SOURCED" -o -n "$NOSYSZSHRC" ]; then return; fi
diff --git a/modules/programs/zsh/fzf-history.zsh b/modules/programs/zsh/fzf-history.zsh
new file mode 100644
index 0000000..ba69095
--- /dev/null
+++ b/modules/programs/zsh/fzf-history.zsh
@@ -0,0 +1,28 @@
+__fzf_use_tmux__() {
+  [ -n "$TMUX_PANE" ] && [ "${FZF_TMUX:-0}" != 0 ] && [ ${LINES:-40} -gt 15 ]
+}
+
+__fzfcmd() {
+  __fzf_use_tmux__ &&
+    echo "fzf-tmux -d${FZF_TMUX_HEIGHT:-40%}" || echo "fzf"
+}
+
+# CTRL-R - Paste the selected command from history into the command line
+fzf-history-widget() {
+  local selected num
+  setopt localoptions noglobsubst pipefail 2> /dev/null
+  selected=( $(fc -l 1 |
+    FZF_DEFAULT_OPTS="--height ${FZF_TMUX_HEIGHT:-40%} $FZF_DEFAULT_OPTS +s --tac -n2..,.. --tiebreak=index --bind=ctrl-r:toggle-sort $FZF_CTRL_R_OPTS --query=${(q)LBUFFER} +m" $(__fzfcmd)) )
+  local ret=$?
+  if [ -n "$selected" ]; then
+    num=$selected[1]
+    if [ -n "$num" ]; then
+      zle vi-fetch-history -n $num
+    fi
+  fi
+  zle redisplay
+  typeset -f zle-line-init >/dev/null && zle zle-line-init
+  return $ret
+}
+zle     -N   fzf-history-widget
+bindkey '^R' fzf-history-widget