From e00c72a094bd8ef422be8d6e6c89b9b3f656246a Mon Sep 17 00:00:00 2001
From: Hugo Villeneuve <hugo@hugovil.com>
Date: Sat, 7 Oct 2023 16:35:34 -0400
Subject: [PATCH] Pad frame index with leading zeroes

---
 fgen.sh | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/fgen.sh b/fgen.sh
index f2c961f..7dc2bb2 100755
--- a/fgen.sh
+++ b/fgen.sh
@@ -21,6 +21,8 @@ dry_run=0
 
 SED=sed
 
+F_FMT="%04d"
+
 # When reading a file line by line, if a command inside the loop
 # also reads stdin, it can exhaust the input file.
 # -nostdin: disable ffmpeg interaction on standard input:
@@ -111,6 +113,16 @@ function get_dup_to()
     echo "${token}"
 }
 
+# Generate frame index name with leading zeroes:
+# Arg1: frame number
+function get_frame_name()
+{
+    local index
+
+    index=$(printf "${F_FMT}" ${1})
+    echo "${dest}/${group}-f${index}.png"
+}
+
 # Arg1: start frame
 # Arg1: end frame
 function insert_empty_frames()
@@ -118,13 +130,17 @@ function insert_empty_frames()
     local w
     local start
     local end
+    local wfname
 
     start=${1}
     end=${2}
 
     for w in $(seq ${start} ${end}); do
         log_dbg "New frame ID: ${w} (empty)"
-        cp ${dest}/background.png ${dest}/${group}-f${w}.png
+
+        wfname=$(get_frame_name ${w})
+
+        cp ${dest}/background.png ${wfname}
     done
 }
 
@@ -315,12 +331,14 @@ if [ ${trames} -eq 1 ]; then
 
             log_dbg "New frame ID: ${nf}"
 
+            fname=$(get_frame_name ${nf})
+
             if [ ${dry_run} -eq 1 ]; then
-                touch ${dest}/${group}-f${nf}.png
+                touch ${fname}
             else
                 convert -colorspace sRGB -page +0+0 ${dest}/background.png \
                         ${files} -background none -layers merge \
-                        ${dest}/${group}-f${nf}.png
+                        ${fname}
             fi
 
             if [ x"${dup_from}" != x"" ]; then
@@ -331,8 +349,10 @@ if [ ${trames} -eq 1 ]; then
                 for w in $(seq ${dup_start} ${dup_to}); do
                     log_dbg "New frame ID: ${w} (duplicate)"
 
+                    wfname=$(get_frame_name ${w})
+
                     # Use symlink???
-                    cp ${dest}/${group}-f${nf}.png ${dest}/${group}-f${w}.png
+                    cp ${fname} ${wfname}
                 done
             fi
 
-- 
2.20.1