From 44b785e81bc94e4bab1d681193336ca60e7200f6 Mon Sep 17 00:00:00 2001
From: Javi Merino <merino.jav@gmail.com>
Date: Thu, 12 May 2022 07:42:17 +0100
Subject: [PATCH] Add an option to remove duplicates from search

Some users may prefer to keep duplicates in their zsh history, but
drop them from search.  The awk manual[0] recommends this.

[0] https://www.gnu.org/software/gawk/manual/html_node/History-Sorting.html
---
 README.md                  |  1 +
 zsh-fzf-history-search.zsh | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 7deff00..8c8d8e7 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ plugins=(… zsh-fzf-history-search)
 | `ZSH_FZF_HISTORY_SEARCH_END_OF_LINE`      | Put the cursor on at the end of the line after completion, `empty=false` (default: `''`)          |
 | `ZSH_FZF_HISTORY_SEARCH_EVENT_NUMBERS`    | Include event numbers in search.  Set to 0 to remove event numbers from the search. (default: `1`)|
 | `ZSH_FZF_HISTORY_SEARCH_DATES_IN_SEARCH`  | Include ISO8601 timestamps in search.  Set to 0 to remove them from the search. (default: `1`)    |
+| `ZSH_FZF_HISTORY_SEARCH_REMOVE_DUPLICATES`| Remove duplicate entries from search.  Only makes sense with `EVENT_NUMBERS` and `DATE_INSEARCH` 0 (false). (default: ``)    |
 
 
 ## TODO
diff --git a/zsh-fzf-history-search.zsh b/zsh-fzf-history-search.zsh
index 264aa32..84a0b18 100644
--- a/zsh-fzf-history-search.zsh
+++ b/zsh-fzf-history-search.zsh
@@ -25,6 +25,10 @@ typeset -g ZSH_FZF_HISTORY_SEARCH_EVENT_NUMBERS=1
 (( ! ${+ZSH_FZF_HISTORY_SEARCH_DATES_IN_SEARCH} )) &&
 typeset -g ZSH_FZF_HISTORY_SEARCH_DATES_IN_SEARCH=1
 
+# Remove duplicate entries in history
+(( ! ${+ZSH_FZF_HISTORY_SEARCH_REMOVE_DUPLICATES} )) &&
+typeset -g ZSH_FZF_HISTORY_SEARCH_REMOVE_DUPLICATES=''
+
 fzf_history_search() {
   setopt extendedglob
 
@@ -41,7 +45,18 @@ fzf_history_search() {
     ((CANDIDATE_LEADING_FIELDS+=2))
   fi
 
-  candidates=(${(f)"$(fc ${=FC_ARGS} -1 0 | fzf ${=ZSH_FZF_HISTORY_SEARCH_FZF_ARGS} ${=ZSH_FZF_HISTORY_SEARCH_FZF_EXTRA_ARGS} -q "$BUFFER")"})
+  history_cmd="fc ${=FC_ARGS} -1 0"
+
+  if [ -n "${ZSH_FZF_HISTORY_SEARCH_REMOVE_DUPLICATES}" ];then
+    if (( $+commands[awk] )); then
+      history_cmd="$history_cmd | awk '!seen[\$0]++'"
+    else
+      # In case awk is not installed fallback to uniq. It will only remove commands that are repeated consecutively.
+      history_cmd="$history_cmd | uniq"
+    fi
+  fi
+
+  candidates=(${(f)"$(eval $history_cmd | fzf ${=ZSH_FZF_HISTORY_SEARCH_FZF_ARGS} ${=ZSH_FZF_HISTORY_SEARCH_FZF_EXTRA_ARGS} -q "$BUFFER")"})
   local ret=$?
   if [ -n "$candidates" ]; then
     BUFFER="${candidates[@]/(#m)*/${${(As: :)MATCH}[${CANDIDATE_LEADING_FIELDS},-1]}}"