X-Git-Url: http://git.tuebingen.mpg.de/?p=gsu.git;a=blobdiff_plain;f=gui;h=2e8b40feb35b10aaba383375aedabea844443d89;hp=958c315d18e9bb5a6ee980a69ffeb25adf05f884;hb=a83461ac7e653a1caece11dba3f16c6db6fe8509;hpb=ed9be5dbf52b45497838034033e210ce984c17a6

diff --git a/gui b/gui
index 958c315..2e8b40f 100644
--- a/gui
+++ b/gui
@@ -1,4 +1,6 @@
 #!/bin/bash
+# Copyright (C) 2006 Andre Noll
+# Licensed under the LGPL, version 3. See COPYING and COPYING.LESSER.
 
 if [[ "$(type -t _gsu_setup)" != "function" ]]; then
 	gsu_dir=${gsu_dir:-${BASH_SOURCE[0]%/*}}
@@ -6,7 +8,7 @@ if [[ "$(type -t _gsu_setup)" != "function" ]]; then
 	_gsu_setup
 fi
 
-export GSU_NODE_NAME_PATTERN='[a-zA-Z_]'
+_gsu_node_name_pattern='[a-zA-Z_]'
 
 _get_geometry()
 {
@@ -22,6 +24,27 @@ _get_geometry()
 	result="$y $x"
 }
 
+_set_dialog_ret()
+{
+	local ec="$1"
+
+	case "$ec" in
+	0) ret=$GSU_SUCCESS;;
+	1) ret=1;; # cancelled
+	*)
+		result="dialog exit code $ec"
+		ret=-$E_GSU_DIALOG
+	esac
+}
+
+# Open a dialog box which asks the user to input a text
+#
+# Usage: gsu_input_box <text> <init>
+#
+# <text> is displayed above of the input field, which is is preset to <init>.
+# The entered text is returned in $result. On success (user pressed OK)
+# the function returns zero. If the user selected Cancel, the return value is
+# one. On dialog errors, a negative error code is returned.
 gsu_inputbox()
 {
 	local g text="$1" init="$2"
@@ -29,36 +52,52 @@ gsu_inputbox()
 	_get_geometry
 	g="$result"
 	result="$(dialog --inputbox "$text" $g "$init" 3>&1 1>&2 2>&3 3>&-)"
-	ret="$?"
+	_set_dialog_ret $?
 }
 
+# Show the given file in a text box
+#
+# Usage: gsu_textbox <path>
+#
+# The box has an OK button which closes the box when activated.
 gsu_textbox()
 {
-	local file="$1"
+	local g file="$1"
 
 	_get_geometry
-	dialog --textbox "$file" $result
+	g="$result"
+
+	ret=-$E_GSU_DIALOG
+	result='textbox'
+	dialog --textbox "$file" $g
+	_set_dialog_ret $?
 }
 
-# dialog segfaults if message is too long. Hence we always use a temporary file
+# Show a message in a text box
+#
+# Usage: gsu_msgbox <text>
+#
+# This is like gsu_textbox() but the text is passed as a string.
 gsu_msgbox()
 {
-	local tmp="$(mktemp gsu_msgbox.XXXXXXXXXX)"
-
-	if (($? != 0)); then
-		dialog --msgbox "mktemp error" 0 0
-		return
-	fi
+	local tmp
+
+	# Some versions of dialog segfault if the text is too long. Hence we
+	# always use a temporary file.
+	gsu_make_tempfile 'gsu_msgbox.XXXXXXXXXX'
+	(($ret < 0)) && return
+	tmp="$result"
+	trap "rm -f $tmp" EXIT
 	echo "$1" > "$tmp"
 	gsu_textbox "$tmp"
-	rm -f "$tmp"
+	rm -f "$tmp" # ignore errors
 }
 
-gsu_menu()
+_gsu_menu()
 {
 	local header="${1:-root}"
 	local items="$2"
-	local i state opts num=0
+	local i opts num=0
 
 	_get_geometry
 	opts="$result 16"
@@ -67,21 +106,23 @@ gsu_menu()
 		opts+=" $i $num"
 	done
 	result="$(dialog --menu "$gsu_banner_txt ($header)" $opts 3>&1 1>&2 2>&3 3>&-)"
-	ret="$?"
+	_set_dialog_ret $?
 }
 
 _get_level()
 {
-	local tmp="${1%%$GSU_NODE_NAME_PATTERN*}"
+	local tmp="${1%%$_gsu_node_name_pattern*}"
 	result="${#tmp}"
 }
 
 _get_subtree()
 {
 	local tree="$1" root="${2%/}"
-	local TAB='	'
+	local first TAB='	'
 
-	first="$(grep -n "$TAB\{1,\}$root/" <<< "$tree")"
+	ret=-$E_GSU_MENU_TREE
+	result="subtree grep failed"
+	first="$(grep -n "$TAB\{1,\}$root/" <<< "$tree")" || return
 	[[ -z "$first" ]] && return
 
 	line_num="${first%%:*}"
@@ -90,16 +131,27 @@ _get_subtree()
 
 	#echo "line: $line_num, root: $root, indent level: $level"
 	result="$(sed -e "1,${line_num}d;" <<< "$tree" \
-		| sed -e "/^$TAB\{1,$level\}$GSU_NODE_NAME_PATTERN/,\$d" \
+		| sed -e "/^$TAB\{1,$level\}$_gsu_node_name_pattern/,\$d" \
 		| sed -e "/^$TAB\{$(($level + 2))\}/d")"
-	ret="$level"
+	if (($? != 0)); then
+		ret=-$E_GSU_MENU_TREE
+		result="sed command for subtree $root failed"
+		return
+	fi
+	ret=$GSU_SUCCESS
 }
 
 _get_root_nodes()
 {
 	local tree="$1" TAB='	'
 
-	result="$(grep "^${TAB}${GSU_NODE_NAME_PATTERN}" <<< "$tree")"
+	result="$(grep "^${TAB}${_gsu_node_name_pattern}" <<< "$tree")"
+	if (($? != 0)); then
+		ret=-$E_GSU_MENU_TREE
+		result="root node grep failed"
+		return
+	fi
+	ret=$GSU_SUCCESS
 }
 
 _browse()
@@ -108,14 +160,16 @@ _browse()
 	local tree="$2" subtree="$3"
 
 	while :; do
-		gsu_menu "$header" "$subtree"
-		(($ret != 0)) && return
-		[[ -z "$result" ]] && return
+		_gsu_menu "$header" "$subtree"
+		(($ret < 0)) && return
+		[[ -z "$result" ]] && return # menu was cancelled
 		if [[ "${result%/}" != "$result" ]]; then
 			old_header="$header"
 			header="$result"
 			_get_subtree "$tree" "$header"
+			(($ret < 0)) && return
 			_browse "$header" "$tree" "$result"
+			(($ret < 0)) && return
 			header="$old_header"
 			continue
 		fi