From acd042453efecb299559b54b4cf5a0564a65fde8 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 29 Oct 2015 00:59:43 -0400
Subject: tui_show_prompt(): Implement line editing

---
(limited to 'src/ui')

diff --git a/src/ui/tui.sh b/src/ui/tui.sh
index b121906..6cf0f9f 100644
--- a/src/ui/tui.sh
+++ b/src/ui/tui.sh
@@ -188,6 +188,8 @@ tui_show_prompt()
 	local curpos=0
 	local focus=0
 	local key=
+	local mask=
+	local buffer=
 
 	# Calculate width and draw the box.
 	w=$(expr ${#title} + 4)
@@ -266,24 +268,62 @@ tui_show_prompt()
 					fi
 					;;
 				KEY_DEL)
-					if [ ${curpos} -lt ${#input} ]; then
-						: TODO
-					fi
+					[ ${curpos} -lt ${#input} ] || continue
+					i=0
+					mask=''
+					while [ ${i} -lt ${curpos} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^\\(${mask}\\).\\(.*\\)\$/\1\2/"
+					input="$(printf '%s' "${input}" | sed \
+						"${cmd}")"
 					;;
 				KEY_SPACE)
-					if [ ${curpos} -lt ${len} ]; then
-						# TODO: Handle curpos not at end
-						input="${input} "
-						curpos=$(($curpos + 1))
-					fi
+					[ ${curpos} -lt ${len} ] || continue
+					key=' '
+					i=0
+					mask=''
+					while [ ${i} -lt ${curpos} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^\\(${mask}\\).*\$/\1/"
+					buffer="$(printf '%s' "${input}" | sed \
+						"${cmd}")${key}"
+					i=${curpos}
+					mask=''
+					while [ ${i} -lt ${#input} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^.*\\(${mask}\\)\$/\1/"
+					input="${buffer}$(printf '%s' \
+						"${input}" | sed "${cmd}")"
+					curpos=$(($curpos + 1))
 					;;
 				KEY_*);;
 				*)
-					if [ ${curpos} -lt ${len} ]; then
-						# TODO: Handle curpos not at end
-						input="${input}${key}"
-						curpos=$(($curpos + 1))
-					fi
+					[ ${curpos} -lt ${len} ] || continue
+					i=0
+					mask=''
+					while [ ${i} -lt ${curpos} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^\\(${mask}\\).*\$/\1/"
+					buffer="$(printf '%s' "${input}" | sed \
+						"${cmd}")${key}"
+					i=${curpos}
+					mask=''
+					while [ ${i} -lt ${#input} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^.*\\(${mask}\\)\$/\1/"
+					input="${buffer}$(printf '%s' \
+						"${input}" | sed "${cmd}")"
+					curpos=$(($curpos + 1))
 					;;
 			esac
 		elif [ ${focus} -eq 1 ]; then
--
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