From 466d18e97d8a34ede3b5ec4dc48aaaa6c13f8046 Mon Sep 17 00:00:00 2001
From: William Melody <hi@williammelody.com>
Date: Tue, 2 Apr 2024 23:05:43 -0700
Subject: [PATCH] Avoid `grep --color` option for improved OpenBSD
 compatibility.

refs gh-313
---
 nb | 62 +++++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 37 insertions(+), 25 deletions(-)

diff --git a/nb b/nb
index 59740363..eecfb201 100755
--- a/nb
+++ b/nb
@@ -2358,6 +2358,18 @@ _get_visible_length() {
   printf "%s\\n" "${_calculated_length:-0}"
 }
 
+# _grep_supports_color()
+#
+# Usage:
+#   _grep_supports_color
+#
+# Exit / Error / Return Status:
+#   0 (success, true)  If grep supports the --color option.
+#   1 (error,  false)  if not.
+_grep_supports_color() {
+  printf "\\n" | grep --color=never "" >/dev/null 2>&1
+}
+
 # _highlight_syntax_if_available()
 #
 # Usage:
@@ -2595,12 +2607,12 @@ _list_files() {
 
       case "${_type}" in
         bookmark|bookmarks)
-          grep --color=never    \
+          grep                  \
             -e '\.bookmark\.'   \
             -e '\-bookmark\.'
           ;;
         book|books)
-          grep --color=never -e 'epub$'
+          grep -e 'epub$'
           ;;
         note|notes)
           for __extension in "${_TEXT_FILE_EXTENSIONS[@]}"
@@ -2608,9 +2620,9 @@ _list_files() {
             _grep_patterns+=("-e" "${__extension}$")
           done
 
-          grep --color=never "${_grep_patterns[@]}" \
-            | grep --color=never -v                 \
-                -e '\.bookmark\.'                   \
+          grep "${_grep_patterns[@]}" \
+            | grep -v                 \
+                -e '\.bookmark\.'     \
                 -e '\-bookmark\.'
           ;;
         folder|folders|directory|directories)
@@ -2629,7 +2641,7 @@ _list_files() {
             _grep_patterns+=("-e" "${__extension}$" "-e" "${__extension}.enc$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         audio|music)
           for __extension in "${_AUDIO_FILE_EXTENSIONS[@]}"
@@ -2637,7 +2649,7 @@ _list_files() {
             _grep_patterns+=("-e" "${__extension}$" "-e" "${__extension}.enc$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         document|documents|doc|docs)
           for __extension in "${_DOCUMENT_FILE_EXTENSIONS[@]}"
@@ -2645,7 +2657,7 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$" "-e" "\.${__extension}\.enc$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         encrypted)
           for __extension in "${_ENCRYPTED_FILE_EXTENSIONS[@]}"
@@ -2653,7 +2665,7 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         image|images|picture|pictures)
           for __extension in "${_IMAGE_FILE_EXTENSIONS[@]}"
@@ -2661,7 +2673,7 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$" "-e" "\.${__extension}\.enc$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         text|txt)
           for __extension in "${_TEXT_FILE_EXTENSIONS[@]}"
@@ -2669,7 +2681,7 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         todo|todos)
           for __extension in "${_TODO_FILE_EXTENSIONS[@]}"
@@ -2677,7 +2689,7 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         video|videos)
           for __extension in "${_VIDEO_FILE_EXTENSIONS[@]}"
@@ -2685,10 +2697,10 @@ _list_files() {
             _grep_patterns+=("-e" "\.${__extension}$" "-e" "\.${__extension}\.enc$")
           done
 
-          grep --color=never "${_grep_patterns[@]}"
+          grep "${_grep_patterns[@]}"
           ;;
         *)
-          grep --color=never -e "\.${_type}$"
+          grep -e "\.${_type}$"
           ;;
       esac
     else
@@ -3384,7 +3396,7 @@ _string_is_url() {
     _url_match_patterns+=(-e "^${__url_match_pattern}$")
   done
 
-  printf "%s\\n" "${1:-}" | grep -E -q --color=never "${_url_match_patterns[@]:-}"
+  printf "%s\\n" "${1:-}" | grep -E -q "${_url_match_patterns[@]:-}" &>/dev/null
 }
 
 # _wrap()
@@ -11946,7 +11958,6 @@ _resolve_links() {
         2>/dev/null || :
     else
       grep                    \
-        --color=never         \
         --extended-regexp     \
         -h                    \
         --only-matching       \
@@ -13590,7 +13601,7 @@ _bookmark() {
           _wayback_response="$(
             _download_from                                                \
               "https://archive.org/wayback/available?url=${_target_url}"  \
-              | grep --color=never 'closest'                              \
+              | grep 'closest'                                            \
               | sed -E "s/.*\"closest\": {([^}]+)}.*/\1/g"                \
               | sed -E "s/.*\"url\": \"([^\"]+)\".*/\1/g" || printf ""
           )"
@@ -16963,7 +16974,6 @@ _search() {
     fi
 
     local _grep_arguments=(
-      "--color=never"
       "--extended-regexp"
       "-I"
       "--ignore-case"
@@ -17283,11 +17293,14 @@ _search() {
               || return 0 # Don't fail out within a single scope.
         elif _search_with "grep" "${_search_utility:-}"
         then
-          if ((_COLOR_ENABLED))
+          if _grep_supports_color
           then
-            _search_args+=("--color=always")
-          else
-            _search_args+=("--color=never")
+            if ((_COLOR_ENABLED))
+            then
+              _search_args+=("--color=always")
+            else
+              _search_args+=("--color=never")
+            fi
           fi
 
           set +f
@@ -18599,7 +18612,7 @@ ${_title/\[$' '\]/${_TPUT_SETAF_8}[ ]${_TPUT_SGR0}}"
 
     local _target_url=
     _target_url="$(
-      grep -E --color=never           \
+      grep -E                         \
         "${_url_match_patterns[@]:-}" \
         "${_target_path}"             \
         | head -n 1                   \
@@ -24944,7 +24957,6 @@ HEREDOC
       elif _command_name="$(
         printf "%s\\n" "${_normalized_input}" \
           | grep                              \
-              --color=never                   \
               --only-matching                 \
               -e '^code'                      \
               -e '^emacs'                     \
@@ -26015,7 +26027,7 @@ _todo() {
             --visible-length "${_extra_length:-0}"
 
           {
-            grep --color=never          \
+            grep                        \
               -e "- \[[[:space:]]*\] "  \
               -e "- \[x\] "             \
               "${__item_path:-}" || :