Add bash line editor.

.local/share/blesh/contrib/config/github499-append-to-last-modified.bash

@@ -0,0 +1,37 @@
+# blesh/contrib/config/github499-append-to-last-modified.bash
+# (C) 2024, Koichi Murase <myoga.murase@gmail.com>
+#
+# Example:
+#
+#   # ~/.blerc
+#   ble-import config/github499-append-to-last-modified
+#   ble-bind -f 'M-insert' github499/append-to-last-modified
+#
+# References:
+#
+#   https://github.com/akinomyoga/ble.sh/discussions/499
+#
+
+_ble_contrib_github499_last_modified_index=
+function ble/contrib/config:github499/record-last-modified-index {
+  local reason=${4-}
+  [[ $reason == history ]] && return 0
+  local index
+  ble/history/get-index
+  _ble_contrib_github499_last_modified_index=$index
+}
+ble/array#push _ble_edit_dirty_observer ble/contrib/config:github499/record-last-modified-index
+
+function ble/widget/github499/append-to-last-modified {
+  local ins=$_ble_edit_str
+  [[ $ins ]] || return 1
+
+  local index=$_ble_contrib_github499_last_modified_index
+  [[ $index ]] || ble/history/get-count -v index
+  ble-edit/history/goto "$index"
+  [[ $_ble_edit_str && $_ble_edit_str != *$'\n' ]] && ins=$'\n'$ins
+  local p=${#_ble_edit_str}
+  ble-edit/content/replace-limited "$p" "$p" "$ins"
+  ((_ble_edit_ind=${#_ble_edit_str}))
+  return 0
+}