diff options
Diffstat (limited to 'timezone/tzselect.ksh')
| -rw-r--r-- | timezone/tzselect.ksh | 366 |
1 files changed, 276 insertions, 90 deletions
diff --git a/timezone/tzselect.ksh b/timezone/tzselect.ksh index 8e66b44273..9d7069116a 100644 --- a/timezone/tzselect.ksh +++ b/timezone/tzselect.ksh @@ -11,7 +11,7 @@ REPORT_BUGS_TO=tz@iana.org # Porting notes: # -# This script requires a Posix-like shell with the extension of a +# This script requires a Posix-like shell and prefers the extension of a # 'select' statement. The 'select' statement was introduced in the # Korn shell and is available in Bash and other shell implementations. # If your host lacks both Bash and the Korn shell, you can get their @@ -21,6 +21,10 @@ REPORT_BUGS_TO=tz@iana.org # Korn Shell <http://www.kornshell.com/> # Public Domain Korn Shell <http://www.cs.mun.ca/~michael/pdksh/> # +# For portability to Solaris 9 /bin/sh this script avoids some POSIX +# features and common extensions, such as $(...) (which works sometimes +# but not others), $((...)), and $10. +# # This script also uses several features of modern awk programs. # If your host lacks awk, or has an old awk that does not conform to Posix, # you can use either of the following free programs instead: @@ -31,7 +35,7 @@ REPORT_BUGS_TO=tz@iana.org # Specify default values for environment variables if they are unset. : ${AWK=awk} -: ${TZDIR=$(pwd)} +: ${TZDIR=`pwd`} # Check for awk Posix compliance. ($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1 @@ -40,21 +44,125 @@ REPORT_BUGS_TO=tz@iana.org exit 1 } -if [ "$1" = "--help" ]; then - cat <<EOF -Usage: tzselect +coord= +location_limit=10 + +usage="Usage: tzselect [--version] [--help] [-c COORD] [-n LIMIT] Select a time zone interactively. -Report bugs to $REPORT_BUGS_TO. -EOF - exit -elif [ "$1" = "--version" ]; then - cat <<EOF -tzselect $PKGVERSION$TZVERSION -EOF - exit +Options: + + -c COORD + Instead of asking for continent and then country and then city, + ask for selection from time zones whose largest cities + are closest to the location with geographical coordinates COORD. + COORD should use ISO 6709 notation, for example, '-c +4852+00220' + for Paris (in degrees and minutes, North and East), or + '-c -35-058' for Buenos Aires (in degrees, South and West). + + -n LIMIT + Display at most LIMIT locations when -c is used (default $location_limit). + + --version + Output version information. + + --help + Output this help. + +Report bugs to $REPORT_BUGS_TO." + +# Ask the user to select from the function's arguments, +# and assign the selected argument to the variable 'select_result'. +# Exit on EOF or I/O error. Use the shell's 'select' builtin if available, +# falling back on a less-nice but portable substitute otherwise. +if + case $BASH_VERSION in + ?*) : ;; + '') + # '; exit' should be redundant, but Dash doesn't properly fail without it. + (eval 'set --; select x; do break; done; exit') 2>/dev/null + esac +then + # Do this inside 'eval', as otherwise the shell might exit when parsing it + # even though it is never executed. + eval ' + doselect() { + select select_result + do + case $select_result in + "") echo >&2 "Please enter a number in range." ;; + ?*) break + esac + done || exit + } + + # Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout. + case $BASH_VERSION in + [01].*) + case `echo 1 | (select x in x; do break; done) 2>/dev/null` in + ?*) PS3= + esac + esac + ' +else + doselect() { + # Field width of the prompt numbers. + select_width=`expr $# : '.*'` + + select_i= + + while : + do + case $select_i in + '') + select_i=0 + for select_word + do + select_i=`expr $select_i + 1` + printf >&2 "%${select_width}d) %s\\n" $select_i "$select_word" + done ;; + *[!0-9]*) + echo >&2 'Please enter a number in range.' ;; + *) + if test 1 -le $select_i && test $select_i -le $#; then + shift `expr $select_i - 1` + select_result=$1 + break + fi + echo >&2 'Please enter a number in range.' + esac + + # Prompt and read input. + printf >&2 %s "${PS3-#? }" + read select_i || exit + done + } fi +while getopts c:n:-: opt +do + case $opt$OPTARG in + c*) + coord=$OPTARG ;; + n*) + location_limit=$OPTARG ;; + -help) + exec echo "$usage" ;; + -version) + exec echo "tzselect $PKGVERSION$TZVERSION" ;; + -*) + echo >&2 "$0: -$opt$OPTARG: unknown option; try '$0 --help'"; exit 1 ;; + *) + echo >&2 "$0: try '$0 --help'"; exit 1 ;; + esac +done + +shift `expr $OPTIND - 1` +case $# in +0) ;; +*) echo >&2 "$0: $1: unknown argument"; exit 1 ;; +esac + # Make sure the tables are readable. TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab TZ_ZONE_TABLE=$TZDIR/zone.tab @@ -71,11 +179,65 @@ newline=' IFS=$newline -# Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout. -case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in -?*) PS3= -esac - +# Awk script to read a time zone table and output the same table, +# with each column preceded by its distance from 'here'. +output_distances=' + BEGIN { + FS = "\t" + while (getline <TZ_COUNTRY_TABLE) + if ($0 ~ /^[^#]/) + country[$1] = $2 + country["US"] = "US" # Otherwise the strings get too long. + } + function convert_coord(coord, deg, min, ilen, sign, sec) { + if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9][0-9][0-9]([^0-9]|$)/) { + degminsec = coord + intdeg = degminsec < 0 ? -int(-degminsec / 10000) : int(degminsec / 10000) + minsec = degminsec - intdeg * 10000 + intmin = minsec < 0 ? -int(-minsec / 100) : int(minsec / 100) + sec = minsec - intmin * 100 + deg = (intdeg * 3600 + intmin * 60 + sec) / 3600 + } else if (coord ~ /^[-+]?[0-9]?[0-9][0-9][0-9][0-9]([^0-9]|$)/) { + degmin = coord + intdeg = degmin < 0 ? -int(-degmin / 100) : int(degmin / 100) + min = degmin - intdeg * 100 + deg = (intdeg * 60 + min) / 60 + } else + deg = coord + return deg * 0.017453292519943296 + } + function convert_latitude(coord) { + match(coord, /..*[-+]/) + return convert_coord(substr(coord, 1, RLENGTH - 1)) + } + function convert_longitude(coord) { + match(coord, /..*[-+]/) + return convert_coord(substr(coord, RLENGTH)) + } + # Great-circle distance between points with given latitude and longitude. + # Inputs and output are in radians. This uses the great-circle special + # case of the Vicenty formula for distances on ellipsoids. + function dist(lat1, long1, lat2, long2, dlong, x, y, num, denom) { + dlong = long2 - long1 + x = cos (lat2) * sin (dlong) + y = cos (lat1) * sin (lat2) - sin (lat1) * cos (lat2) * cos (dlong) + num = sqrt (x * x + y * y) + denom = sin (lat1) * sin (lat2) + cos (lat1) * cos (lat2) * cos (dlong) + return atan2(num, denom) + } + BEGIN { + coord_lat = convert_latitude(coord) + coord_long = convert_longitude(coord) + } + /^[^#]/ { + here_lat = convert_latitude($2) + here_long = convert_longitude($2) + line = $1 "\t" $2 "\t" $3 "\t" country[$1] + if (NF == 4) + line = line " - " $4 + printf "%g\t%s\n", dist(coord_lat, coord_long, here_lat, here_long), line + } +' # Begin the main loop. We come back here if the user wants to retry. while @@ -87,39 +249,46 @@ while country= region= + case $coord in + ?*) + continent=coord;; + '') # Ask the user for continent or ocean. - echo >&2 'Please select a continent or ocean.' - - select continent in \ - Africa \ - Americas \ - Antarctica \ - 'Arctic Ocean' \ - Asia \ - 'Atlantic Ocean' \ - Australia \ - Europe \ - 'Indian Ocean' \ - 'Pacific Ocean' \ - 'none - I want to specify the time zone using the Posix TZ format.' - do + echo >&2 'Please select a continent, ocean, "coord", or "TZ".' + + quoted_continents=` + $AWK ' + BEGIN { FS = "\t" } + /^[^#]/ { + entry = substr($3, 1, index($3, "/") - 1) + if (entry == "America") + entry = entry "s" + if (entry ~ /^(Arctic|Atlantic|Indian|Pacific)$/) + entry = entry " Ocean" + printf "'\''%s'\''\n", entry + } + ' $TZ_ZONE_TABLE | + sort -u | + tr '\n' ' ' + echo '' + ` + + eval ' + doselect '"$quoted_continents"' \ + "coord - I want to use geographical coordinates." \ + "TZ - I want to specify the time zone using the Posix TZ format." + continent=$select_result case $continent in - '') - echo >&2 'Please enter a number in range.';; - ?*) - case $continent in - Americas) continent=America;; - *' '*) continent=$(expr "$continent" : '\([^ ]*\)') - esac - break + Americas) continent=America;; + *" "*) continent=`expr "$continent" : '\''\([^ ]*\)'\''` esac - done + ' + esac + case $continent in - '') - exit 1;; - none) + TZ) # Ask the user for a Posix TZ string. Check that it conforms. while echo >&2 'Please enter the desired value' \ @@ -144,11 +313,46 @@ while done TZ_for_date=$TZ;; *) + case $continent in + coord) + case $coord in + '') + echo >&2 'Please enter coordinates' \ + 'in ISO 6709 notation.' + echo >&2 'For example, +4042-07403 stands for' + echo >&2 '40 degrees 42 minutes north,' \ + '74 degrees 3 minutes west.' + read coord;; + esac + distance_table=`$AWK \ + -v coord="$coord" \ + -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ + "$output_distances" <$TZ_ZONE_TABLE | + sort -n | + sed "${location_limit}q" + ` + regions=`echo "$distance_table" | $AWK ' + BEGIN { FS = "\t" } + { print $NF } + '` + echo >&2 'Please select one of the following' \ + 'time zone regions,' + echo >&2 'listed roughly in increasing order' \ + "of distance from $coord". + doselect $regions + region=$select_result + TZ=`echo "$distance_table" | $AWK -v region="$region" ' + BEGIN { FS="\t" } + $NF == region { print $4 } + '` + ;; + *) # Get list of names of countries in the continent or ocean. - countries=$($AWK -F'\t' \ + countries=`$AWK \ -v continent="$continent" \ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ ' + BEGIN { FS = "\t" } /^#/ { next } $3 ~ ("^" continent "/") { if (!cc_seen[$1]++) cc_list[++ccs] = $1 @@ -165,35 +369,28 @@ while print country } } - ' <$TZ_ZONE_TABLE | sort -f) + ' <$TZ_ZONE_TABLE | sort -f` # If there's more than one country, ask the user which one. case $countries in *"$newline"*) - echo >&2 'Please select a country.' - select country in $countries - do - case $country in - '') echo >&2 'Please enter a number in range.';; - ?*) break - esac - done - - case $country in - '') exit 1 - esac;; + echo >&2 'Please select a country' \ + 'whose clocks agree with yours.' + doselect $countries + country=$select_result;; *) country=$countries esac # Get list of names of time zone rule regions in the country. - regions=$($AWK -F'\t' \ + regions=`$AWK \ -v country="$country" \ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ ' BEGIN { + FS = "\t" cc = country while (getline <TZ_COUNTRY_TABLE) { if ($0 !~ /^#/ && country == $2) { @@ -203,7 +400,7 @@ while } } $1 == cc { print $4 } - ' <$TZ_ZONE_TABLE) + ' <$TZ_ZONE_TABLE` # If there's more than one region, ask the user which one. @@ -211,27 +408,20 @@ while *"$newline"*) echo >&2 'Please select one of the following' \ 'time zone regions.' - select region in $regions - do - case $region in - '') echo >&2 'Please enter a number in range.';; - ?*) break - esac - done - case $region in - '') exit 1 - esac;; + doselect $regions + region=$select_result;; *) region=$regions esac # Determine TZ from country and region. - TZ=$($AWK -F'\t' \ + TZ=`$AWK \ -v country="$country" \ -v region="$region" \ -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \ ' BEGIN { + FS = "\t" cc = country while (getline <TZ_COUNTRY_TABLE) { if ($0 !~ /^#/ && country == $2) { @@ -241,7 +431,8 @@ while } } $1 == cc && $4 == region { print $3 } - ' <$TZ_ZONE_TABLE) + ' <$TZ_ZONE_TABLE` + esac # Make sure the corresponding zoneinfo file exists. TZ_for_date=$TZDIR/$TZ @@ -259,10 +450,10 @@ while extra_info= for i in 1 2 3 4 5 6 7 8 do - TZdate=$(LANG=C TZ="$TZ_for_date" date) - UTdate=$(LANG=C TZ=UTC0 date) - TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)') - UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)') + TZdate=`LANG=C TZ="$TZ_for_date" date` + UTdate=`LANG=C TZ=UTC0 date` + TZsec=`expr "$TZdate" : '.*:\([0-5][0-9]\)'` + UTsec=`expr "$UTdate" : '.*:\([0-5][0-9]\)'` case $TZsec in $UTsec) extra_info=" @@ -278,28 +469,23 @@ Universal Time is now: $UTdate." echo >&2 "" echo >&2 "The following information has been given:" echo >&2 "" - case $country+$region in - ?*+?*) echo >&2 " $country$newline $region";; - ?*+) echo >&2 " $country";; + case $country%$region%$coord in + ?*%?*%) echo >&2 " $country$newline $region";; + ?*%%) echo >&2 " $country";; + %?*%?*) echo >&2 " coord $coord$newline $region";; + %%?*) echo >&2 " coord $coord";; +) echo >&2 " TZ='$TZ'" esac echo >&2 "" echo >&2 "Therefore TZ='$TZ' will be used.$extra_info" echo >&2 "Is the above information OK?" - ok= - select ok in Yes No - do - case $ok in - '') echo >&2 'Please enter 1 for Yes, or 2 for No.';; - ?*) break - esac - done + doselect Yes No + ok=$select_result case $ok in - '') exit 1;; Yes) break esac -do : +do coord= done case $SHELL in |