user/bkdatev

   1 #!/usr/bin/env bash
   2 # Desc: Baltakatei's verbose date command
   3 # Usage: bkdatev [args]
   4 # Example: bkdatev --date="2001-09-11T09:02:59-04"
   5 # Version: 0.3.0
   6 # Ref/Attrib: [1] "ISO 8601". Wikipedia. https://en.wikipedia.org/wiki/ISO_8601
   7 #             [2] "Changing the Locale in Wine" https://stackoverflow.com/a/16428951
   8 #             [3] "Shanghai vs Beijing" https://bugs.launchpad.net/ubuntu/+source/libgweather/+bug/228554
   9 # Notes:  * Check `ls -R /usr/share/zoneinfo` for time zone names.
  10 #         * Check `cat /usr/share/i18n/SUPPORTED` for supported locales.
  11 #         * For list of valid locales, see: https://manpages.ubuntu.com/manpages/bionic/man3/DateTime::Locale::Catalog.3pm.html
  12 #         * Locations chosen for population, personal signifiance, and spatial coverage.
  13 #         * For International Atomic Time (TAI), use offsets from UTC provided in `/usr/share/zoneinfo/leap-seconds.list`.
  14
  15 yell() { echo "$0: $*" >&2; }
  16 die() { yell "$*"; exit 111; }
  17 must() { "$@" || die "cannot $*"; }
  18 insertStr() {
  19     # Desc: Inserts a string into another string at a specified position.
  20     # Input: arg1: str   str_rec  String to receive insertion
  21     #        arg2: int   pos      Insertion position (0 = append to front)
  22     #        arg3: str   str_ins  String to be inserted
  23     # Output: stdout:    Combined string
  24     # Version: 0.0.2
  25     # Depends: BK-2020-03: yell(), die(), must()
  26     # Ref/Attrib: * BK-2020-03: https://gitlab.com/baltakatei/baltakatei-exdev/
  27     #             * Cooper, Mendel. “Advanced Bash-Scripting Guide: Manipulating Strings”. tldp.org https://tldp.org/LDP/abs/html/string-manipulation.html
  28
  29     local str_rec pos str_ins re len_str_rec;
  30     local pfx_pos_start pfx_len pfx;
  31     local sfx_pos_start sfx_len sfx;
  32
  33     # Check args
  34     if [[ $# -ne 3 ]]; then
  35         yell "ERROR:Invalid argument count:$#";
  36         return 1; fi;
  37     re='^[0-9]+$';
  38     if [[ ! "$2" =~ $re ]]; then
  39         yell "ERROR:Not an int:$2";
  40         return 1; fi;
  41     str_rec="$1";
  42     pos="$2";
  43     str_ins="$3";
  44
  45     # Calculate string stats
  46     len_str_rec="${#str_rec}";
  47
  48     # Form prefix
  49     pfx_pos_start="0";
  50     pfx_len="$pos";
  51     pfx="${str_rec:$pfx_pos_start:$pfx_len}";
  52
  53     # Form suffix
  54     sfx_pos_start="$(( pos ))";
  55     sfx_len="$(( len_str_rec - pos ))";
  56     sfx="${str_rec:$sfx_pos_start:$sfx_len}";
  57
  58     # Print output to stdout
  59     printf "%s%s%s\n" "$pfx" "$str_ins" "$sfx";
  60 }; # Insert string provided at indicated position via stdout
  61 line_sep() {
  62     # Input: var: n_ln
  63     local skip_every=4;
  64     ((n_ln++));
  65     if ! ((n_ln % "$skip_every")); then
  66         printf "\n";
  67     fi;
  68     return 0;
  69 }; # periodically print separating blank line
  70 get_tz_offset() {
  71     # Desc: Get from 'date' the timezone UTC offset in a way
  72     #   compatible with both GNU Coreutils and BSD versions.
  73     # Input: env var: TZ  (time zone for date; e.g. 'America/Denver')
  74     # Depends: date (GNU Coreutils 8.32 or BSD), rev
  75     local ntz ntz ntz_out;
  76     local last2;
  77
  78     # Get numeric time zone string in way compatible with GNU Coreutils and BSD
  79     ntz="$(date "+%z")"; # e.g. "+0530"
  80
  81     # Check if last two characters are trailing zeros that can be removed.
  82     last2="${ntz:3:2}"; # assumes $ntz is 5 characters (i.e. "±HHMM")
  83     #last2="$(rev <<< $ntz)" && last2="${last2:0:2}" && last2="$(rev <<< "$last2")";
  84     if [[ "$last2" == "00" ]]; then
  85         ## ntz_out is truncated by 2 characters
  86         ntz_out="${ntz:0:-2}";
  87     else
  88         ## ntz_out is ntz with semicolon inserted after HH
  89         ntz_out="$(insertStr "$ntz" 3 ":" )";
  90     fi;
  91
  92     # Output via stdout
  93     printf "%s" "$ntz_out";
  94 }; # Format numeric time zone (for BSD date compatibility)
  95 print_dateline() {
  96     # Input: var: $id
  97     #        var: $fs_1
  98     #        var: $fs_2
  99     #        var: $fs_3
 100     #        args: $@
 101     #        env var: TZ (time zone for date; e.g. 'America/Denver')
 102     # Output: stdout
 103     # Depends: printf, date
 104     #          get_tz_offset()
 105     # Ref/Attrib: * Truncate string in printf https://stackoverflow.com/a/46812677
 106     local s_1 s_2 s_2_tz s_3 s_4;
 107
 108     s_1="$id";
 109     s_2="$(date "$@" "$fs_1")"; # ISO-8601 without numeric timezone
 110     s_3="$(date "$@" "$fs_2")"; # Alternate ISO-8601 expressions
 111     s_4="$(date "$@" "$fs_3")"; # locale-specific date strings
 112
 113     # Append numeric timezone to $s_2 with appropriate format
 114     #   (e.g. '-07' for 'Arizona', '+05:45' for 'Asia/Kathmandu')
 115     s_2_tz="$(get_tz_offset)";
 116     s_2="$( printf "%s%s" "$s_2" "$s_2_tz" )";
 117
 118     printf "%-10.10s %-25.25s (%-20.20s) (%s)" "$s_1" "$s_2" "$s_3" "$s_4";
 119     printf "\n";
 120
 121     unset fs_1 fs_2 fs_3 fs_4;
 122     }; # print line of dates
 123 main() {
 124     n_ln=0; # for line_sep()
 125     unset LC_TIME; # Fall back to time zone-specific locale settings.
 126
 127     # format strings
 128     fs_iso8601="+%Y-%m-%dT%H:%M:%S"; # typical ISO-8601 without timezone
 129     fs_iso8601_etc="+%G-W%V-%u, %Y-%j"; # alternate ISO-8601 dates
 130     fs_locale="+%Z; %A; %c"; # locale-specific date strings
 131
 132     # vars for print_dateline()
 133     fs_1="$fs_iso8601";
 134     fs_2="$fs_iso8601_etc";
 135     fs_3="$fs_locale";
 136
 137     # UTC (pop. (2021): 7,837,000,000)
 138     (
 139         export TZ=UTC;
 140         id="UTC";
 141         fs_3="+%s seconds since 1970-01-01T00:00+00";
 142         print_dateline "$@";
 143     ); line_sep;
 144
 145     # Hawaii
 146     (
 147         export TZ=US/Hawaii;
 148         export LANG="haw-US.UTF8";
 149         id="HAWAII";
 150         print_dateline "$@";
 151     ); line_sep;
 152
 153     # Los Angeles, USA
 154     (
 155         export TZ=America/Los_Angeles;
 156         export LANG="en_US.UTF-8";
 157         id="LOS ANGELES";
 158         print_dateline "$@";
 159     ); line_sep;
 160
 161     # Denver, USA (pop. (2021): 711,463)
 162     (
 163         export TZ=America/Denver;
 164         export LANG="en_US.UTF-8";
 165         id="DENVER";
 166         print_dateline "$@";
 167     ); line_sep;
 168
 169     # Chicago, USA (pop. (2021): 711,463)
 170     (
 171         export TZ=America/Chicago;
 172         export LANG="en_US.UTF-8";
 173         id="CHICAGO";
 174         print_dateline "$@";
 175     ); line_sep;
 176
 177     # Mexico City, Mexico (pop. (2018): 21,804,515)
 178     (
 179         export TZ=America/Mexico_City;
 180         export LANG="es_MX.UTF8";
 181         id="MEXICO CITY";
 182         print_dateline "$@";
 183     ); line_sep;
 184
 185     # Panama City, Panama
 186     (
 187         export TZ=America/Panama;
 188         export LANG="es_PA.UTF8";
 189         id="PANAMA CITY";
 190         print_dateline "$@";
 191     ); line_sep;
 192
 193     # New York, USA (pop. (2018): 20,140,470)
 194     (
 195         export TZ=America/New_York;
 196         export LANG="en_US.UTF-8";
 197         id="NEW YORK";
 198         print_dateline "$@";
 199     ); line_sep;
 200
 201     # São Paulo, Brazil
 202     (
 203         export TZ=America/Sao_Paulo;
 204         export LANG="pt_BR.UTF8";
 205         id="SAO PAULO";
 206         print_dateline "$@";
 207     ); line_sep;
 208
 209     # Buenos Aires
 210     (
 211         export TZ=America/Argentina/Buenos_Aires;
 212         export LANG="es_AR.UTF8";
 213         id="BUENOS AIRES";
 214         print_dateline "$@";
 215     ); line_sep;
 216
 217     # London, England
 218     (
 219         export TZ=Europe/London;
 220         export LANG="en_GB.UTF-8";
 221         id="LONDON";
 222         print_dateline "$@";
 223     ); line_sep;
 224
 225     # Kinshasa, Africa
 226     (
 227         export TZ=Africa/Kinshasa;
 228         export LANG="ln_CD.UTF8";
 229         id="KINSHASA";
 230         print_dateline "$@";
 231     ); line_sep;
 232
 233     # Lagos, Africa
 234     (
 235         export TZ=Africa/Lagos;
 236         export LANG="en_NG.UTF8";
 237         id="LAGOS";
 238         print_dateline "$@";
 239     ); line_sep;
 240
 241     # Paris, France
 242     (
 243         export TZ=Europe/Paris;
 244         export LANG="fr_FR.UTF8";
 245         id="PARIS";
 246         print_dateline "$@";
 247     ); line_sep;
 248
 249     # Stockholm, Sweden
 250     (
 251         export TZ=Europe/Stockholm;
 252         export LANG="sv_SE.UTF8";
 253         id="STOCKHOLM";
 254         print_dateline "$@";
 255     ); line_sep;
 256
 257     # Cairo, Egypt
 258     (
 259         export TZ=Africa/Cairo;
 260         export LANG="ar_EG.UTF8";
 261         id="CAIRO";
 262         print_dateline "$@";
 263     ); line_sep;
 264
 265     # Athens (pop. (2020): 3,526,887)
 266     (
 267         export TZ=Europe/Athens;
 268         export LANG="el_GR.UTF8";
 269         id="ATHENS";
 270         print_dateline "$@";
 271     ); line_sep;
 272
 273     # Istanbul (pop. (2020): 13,719,061)
 274     (
 275         export TZ=Asia/Istanbul;
 276         export LANG="tr_TR.UTF8";
 277         id="ISTANBUL";
 278         print_dateline "$@";
 279     ); line_sep;
 280
 281     # Tehran, Iran
 282     (
 283         export TZ=Asia/Tehran;
 284         export LANG="fa_IR.UTF8";
 285         id="TEHRAN";
 286         print_dateline "$@";
 287     ); line_sep;
 288
 289     # Moscow, Russia
 290     (
 291         export TZ=Europe/Moscow;
 292         export LANG="ru_RU.UTF-8";
 293         id="MOSCOW";
 294         print_dateline "$@";
 295     ); line_sep;
 296
 297     # Kyiv, Ukraine (pop. (2021): 2,962,180)
 298     (
 299         export TZ=Europe/Kyiv;
 300         export LANG="uk_UA.UTF-8";
 301         id="KYIV";
 302         print_dateline "$@";
 303     ); line_sep;
 304
 305     # Delhi, India (pop. (2018): 29,000,000)
 306     (
 307         export TZ=Asia/Kolkata;
 308         export LANG="hi_IN.UTF-8";
 309         id="DELHI";
 310         print_dateline "$@";
 311     ); line_sep;
 312
 313     # Jakarta, Indonesia (pop. (2018): 33,430,285)
 314     (
 315         export TZ=Asia/Jakarta;
 316         export LANG="id_ID.UTF8";
 317         id="JAKARTA";
 318         print_dateline "$@";
 319     ); line_sep;
 320
 321     # Singapore, Singapore (pop (2018): 5,792,000)
 322     (
 323         export TZ=Asia/Singapore;
 324         export LANG="en_SG.UTF-8";
 325         id="SINGAPORE";
 326         print_dateline "$@";
 327     ); line_sep;
 328
 329     # Beijing, China (pop. (2018): 19,618,000)
 330     (
 331         export TZ=Asia/Shanghai; # [3]
 332         export LANG="zh_CN.UTF-8";
 333         id="BEIJING";
 334         print_dateline "$@";
 335     ); line_sep;
 336
 337     # Taipei, Taiwan (pop (2019): 7,034,084)
 338     (
 339         export TZ=Asia/Taipei; # [3]
 340         export LANG="zh_TW.UTF-8";
 341         id="TAIPEI";
 342         print_dateline "$@";
 343     ); line_sep;
 344
 345     # Tokyo, Japan (pop. (2018): 37,274,000)
 346     (
 347         export TZ=Asia/Tokyo;
 348         export LANG="ja_JP.UTF8";
 349         id="TOKYO";
 350         print_dateline "$@";
 351     ); line_sep;
 352
 353     # Seoul, South Korea (pop. (2018): 25,514,000)
 354     (
 355         export TZ=Asia/Seoul;
 356         export LANG="ko_KR.UTF8";
 357         id="SEOUL";
 358         print_dateline "$@";
 359     ); line_sep;
 360
 361     # Pyongyang, North Korea
 362     (
 363         export TZ=Asia/Pyongyang;
 364         export LANG="ko_KP.UTF8";
 365         id="PYONGYANG";
 366         print_dateline "$@";
 367     ); line_sep;
 368
 369     # Sydney, Australia
 370     (
 371         export TZ=Australia/Sydney;
 372         export LANG="en_AU.UTF8";
 373         id="SYDNEY";
 374         print_dateline "$@";
 375     ); line_sep;
 376
 377     # Guam
 378     (
 379         export TZ=Pacific/Guam;
 380         export LANG="en_GU.UTF8";
 381         id="GUAM";
 382         print_dateline "$@";
 383     ); line_sep;
 384
 385     # Auckland, New Zealand
 386     (
 387         export TZ=Pacific/Auckland;
 388         export LANG="en_NZ.UTF8";
 389         id="AUCKLAND";
 390         print_dateline "$@";
 391     ); line_sep;
 392
 393     return 0;
 394 }; # main program
 395
 396 main "$@";
 397
 398 # Author: Steven Baltakatei Sandoval
 399 # License: GPLv3+