From d15521239665a8d78c37664175b9eacd7d5bcf42 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Thu, 27 Sep 2007 01:38:27 +0000
Subject: align the filename and line numbers in the output of the stack dump
 so that it is much easier to read (trunk r7842)

svn path=/main/branches/2.1.2/; revision=7843
---
 bin/ebuild.sh | 44 ++++++++++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/bin/ebuild.sh b/bin/ebuild.sh
index c2b06b691..c85a49da7 100755
--- a/bin/ebuild.sh
+++ b/bin/ebuild.sh
@@ -284,23 +284,34 @@ register_die_hook() {
 diefunc() {
 	local funcname="$1" lineno="$2" exitcode="$3"
 	shift 3
+
+	local n filespacing=0 linespacing=0
+	# setup spacing to make output easier to read
+	for ((n = ${#FUNCNAME[@]} - 1; n >= 0; --n)); do
+		sourcefile=${BASH_SOURCE[${n}]} sourcefile=${sourcefile##*/}
+		lineno=${BASH_LINENO[${n}]}
+		((filespacing < ${#sourcefile})) && filespacing=${#sourcefile}
+		((linespacing < ${#lineno}))     && linespacing=${#lineno}
+	done
+
 	eerror
 	eerror "ERROR: $CATEGORY/$PF failed."
-	dump_trace 2
-	eerror "  ${BASH_SOURCE[1]##*/}, line ${BASH_LINENO[0]}:   Called die"
+	dump_trace 2 ${filespacing} ${linespacing}
+	eerror "  $(printf "%${filespacing}s" "${BASH_SOURCE[1]##*/}"), line $(printf "%${linespacing}s" "${BASH_LINENO[0]}"):  Called die"
+	eerror
+	eerror " ${*:-(no error message)}"
 	eerror
-	eerror "${*:-(no error message)}"
 	eerror "If you need support, post the topmost build error, and the call stack if relevant."
-	[ -n "${PORTAGE_LOG_FILE}" ] && \
-		eerror "A complete build log is located at '${PORTAGE_LOG_FILE}'."
-	if [ -n "${EBUILD_OVERLAY_ECLASSES}" ] ; then
+	[[ -n ${PORTAGE_LOG_FILE} ]] \
+		&& eerror "A complete build log is located at '${PORTAGE_LOG_FILE}'."
+	if [[ -n ${EBUILD_OVERLAY_ECLASSES} ]] ; then
 		eerror "This ebuild used the following eclasses from overlays:"
 		local x
 		for x in ${EBUILD_OVERLAY_ECLASSES} ; do
 			eerror "  ${x}"
 		done
 	fi
-	if [ "${EBUILD#${PORTDIR}/}" == "${EBUILD}" ] ; then
+	if [[ "${EBUILD#${PORTDIR}/}" == "${EBUILD}" ]] ; then
 		local overlay=${EBUILD%/*}
 		overlay=${overlay%/*}
 		overlay=${overlay%/*}
@@ -308,7 +319,7 @@ diefunc() {
 	fi
 	eerror
 
-	if [ "${EBUILD_PHASE/depend}" == "${EBUILD_PHASE}" ]; then
+	if [[ "${EBUILD_PHASE/depend}" == "${EBUILD_PHASE}" ]] ; then
 		local x
 		for x in $EBUILD_DEATH_HOOKS; do
 			${x} "$@" >&2 1>&2
@@ -322,19 +333,16 @@ diefunc() {
 
 shopt -s extdebug &> /dev/null
 
-# usage- first arg is the number of funcs on the stack to ignore.
-# defaults to 1 (ignoring dump_trace)
+# dump_trace([number of funcs on stack to skip],
+#            [whitespacing for filenames],
+#            [whitespacing for line numbers])
 dump_trace() {
 	local funcname="" sourcefile="" lineno="" n e s="yes"
+	declare -i strip=${1:-1}
+	local filespacing=$2 linespacing=$3
 
-	declare -i strip=1
-
-	if [[ -n $1 ]]; then
-		strip=$(( $1 ))
-	fi
-	
 	eerror "Call stack:"
-	for (( n = ${#FUNCNAME[@]} - 1, p = ${#BASH_ARGV[@]} ; n > $strip ; n-- )) ; do
+	for (( n = ${#FUNCNAME[@]} - 1, p = ${#BASH_ARGV[@]} ; n > ${strip} ; n-- )) ; do
 		funcname=${FUNCNAME[${n} - 1]}
 		sourcefile=$(basename ${BASH_SOURCE[${n}]})
 		lineno=${BASH_LINENO[${n} - 1]}
@@ -347,7 +355,7 @@ dump_trace() {
 			done
 			(( p -= ${BASH_ARGC[${n} - 1]} ))
 		fi
-		eerror "  ${sourcefile}, line ${lineno}:   Called ${funcname}${args:+ ${args}}"
+		eerror "  $(printf "%${filespacing}s" "${sourcefile}"), line $(printf "%${linespacing}s" "${lineno}"):  Called ${funcname}${args:+ ${args}}"
 	done
 }
 
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