From 032e06b7621a5d444257b466949bb99ddcb36bb0 Mon Sep 17 00:00:00 2001
From: Ryan Liptak <squeek502@hotmail.com>
Date: Tue, 23 Aug 2022 17:36:33 -0700
Subject: [PATCH] Meta: Only include headings for populated groups/subgroups in
 emoji.txt

The primary motivation for this is to make `generate-emoji-txt.sh` more
useful for generating a compact list of new emoji being added (e.g.
for use in commit messages / PRs) if it's run with an emoji image
directory that contains only the new emojis.
---
 Meta/generate-emoji-txt.sh | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/Meta/generate-emoji-txt.sh b/Meta/generate-emoji-txt.sh
index 9b247025e5..f195aa4d0d 100755
--- a/Meta/generate-emoji-txt.sh
+++ b/Meta/generate-emoji-txt.sh
@@ -15,14 +15,16 @@ OUTPUT_PATH="$3"
 :>| "$OUTPUT_PATH"
 
 first_heading=true
+printed_group_header=false
+printed_subgroup_header=false
 while IFS= read -r line
 do
-    if [[ $line == \#\ subgroup:\ * || $line == \#\ group:\ * ]]; then
-        if [ $first_heading = false ]; then
-            echo "" >> "$OUTPUT_PATH"
-        fi
-        echo "$line" >> "$OUTPUT_PATH"
-        first_heading=false
+    if [[ $line == \#\ group:\ * ]]; then
+        current_group="$line"
+        printed_group_header=false
+    elif [[ $line == \#\ subgroup:\ * ]]; then
+        current_subgroup="$line"
+        printed_subgroup_header=false
     elif [[ ${#line} -ne 0 && $line != \#* ]]; then
         codepoints_string=${line%%;*}
         IFS=" " read -r -a codepoints <<< "$codepoints_string"
@@ -45,6 +47,20 @@ do
         lookup_filename="${lookup_filename_parts[*]}.png"
 
         if [ -f "$EMOJI_DIR/$lookup_filename" ]; then
+            if [ $printed_group_header = false ]; then
+                if [ $first_heading = false ]; then
+                    echo "" >> "$OUTPUT_PATH"
+                fi
+                echo "$current_group" >> "$OUTPUT_PATH"
+                first_heading=false
+                printed_group_header=true
+            fi
+            if [ $printed_subgroup_header = false ]; then
+                echo "" >> "$OUTPUT_PATH"
+                echo "$current_subgroup" >> "$OUTPUT_PATH"
+                printed_subgroup_header=true
+            fi
+
             emoji_and_name=${line#*# }
             emoji=${emoji_and_name%% E*}
             name_with_version=${emoji_and_name#* }