colour.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ `(un)?colour' commands, and anything working with it.
   3  *@ TODO n_colour_env should be objects, n_COLOUR_IS_ACTIVE() should take
   4  *@ TODO such an object!  We still should work together with n_go_data,
   5  *@ TODO but only for cleanup purposes.  No stack at all, that is to say!
   6  *@ TODO (Note we yet use autorec memory, so with JUMPS this needs care!)
   7  *
   8  * Copyright (c) 2014 - 2018 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   9  *
  10  * Permission to use, copy, modify, and/or distribute this software for any
  11  * purpose with or without fee is hereby granted, provided that the above
  12  * copyright notice and this permission notice appear in all copies.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22 #undef n_FILE
  23 #define n_FILE colour
  24
  25 #ifndef HAVE_AMALGAMATION
  26 # include "nail.h"
  27 #endif
  28
  29 EMPTY_FILE()
  30 #ifdef HAVE_COLOUR
  31
  32 /* Not needed publically, but extends a set from nail.h */
  33 #define n_COLOUR_TAG_ERR ((char*)-1)
  34 #define a_COLOUR_TAG_IS_SPECIAL(P) (PTR2SIZE(P) >= PTR2SIZE(-3))
  35
  36 enum a_colour_type{
  37    a_COLOUR_T_256,
  38    a_COLOUR_T_8,
  39    a_COLOUR_T_1,
  40    a_COLOUR_T_NONE,     /* EQ largest real colour + 1! */
  41    a_COLOUR_T_UNKNOWN   /* Initial value: real one queried before 1st use */
  42 };
  43
  44 enum a_colour_tag_type{
  45    a_COLOUR_TT_NONE,
  46    a_COLOUR_TT_DOT = 1<<0,       /* "dot" */
  47    a_COLOUR_TT_OLDER = 1<<1,     /* "older" */
  48    a_COLOUR_TT_HEADERS = 1<<2,   /* Comma-separated list of headers allowed */
  49
  50    a_COLOUR_TT_SUM = a_COLOUR_TT_DOT | a_COLOUR_TT_OLDER,
  51    a_COLOUR_TT_VIEW = a_COLOUR_TT_HEADERS
  52 };
  53
  54 struct a_colour_type_map{
  55    ui8_t ctm_type;   /* a_colour_type */
  56    char ctm_name[7];
  57 };
  58
  59 struct a_colour_map_id{
  60    ui8_t cmi_ctx;    /* enum n_colour_ctx */
  61    ui8_t cmi_id;     /* enum n_colour_id */
  62    ui8_t cmi_tt;     /* enum a_colour_tag_type */
  63    char const cmi_name[13];
  64 };
  65 n_CTA(n__COLOUR_IDS <= UI8_MAX, "Enumeration exceeds storage datatype");
  66
  67 struct n_colour_pen{
  68    struct str cp_dat;   /* Pre-prepared ISO 6429 escape sequence */
  69 };
  70
  71 struct a_colour_map /* : public n_colour_pen */{
  72    struct n_colour_pen cm_pen;   /* Points into .cm_buf */
  73    struct a_colour_map *cm_next;
  74    char const *cm_tag;           /* Colour tag or NULL for default (last) */
  75    struct a_colour_map_id const *cm_cmi;
  76 #ifdef HAVE_REGEX
  77    regex_t *cm_regex;
  78 #endif
  79    ui32_t cm_refcnt;             /* Beware of reference drops in recursions */
  80    ui32_t cm_user_off;           /* User input offset in .cm_buf */
  81    char cm_buf[n_VFIELD_SIZE(0)];
  82 };
  83
  84 struct a_colour_g{
  85    bool_t cg_is_init;
  86    ui8_t cg_type;                   /* a_colour_type */
  87    ui8_t __cg_pad[6];
  88    struct n_colour_pen cg_reset;    /* The reset sequence */
  89    struct a_colour_map
  90       *cg_maps[a_COLOUR_T_NONE][n__COLOUR_CTX_MAX1][n__COLOUR_IDS];
  91    char cg__reset_buf[n_ALIGN_SMALL(sizeof("\033[0m"))];
  92 };
  93
  94 /* C99: use [INDEX]={} */
  95 /* */
  96 n_CTA(a_COLOUR_T_256 == 0, "Unexpected value of constant");
  97 n_CTA(a_COLOUR_T_8 == 1, "Unexpected value of constant");
  98 n_CTA(a_COLOUR_T_1 == 2, "Unexpected value of constant");
  99 static char const a_colour_types[][8] = {"256", "iso", "mono"};
 100
 101 static struct a_colour_type_map const a_colour_type_maps[] = {
 102    {a_COLOUR_T_256, "256"},
 103    {a_COLOUR_T_8, "8"}, {a_COLOUR_T_8, "iso"}, {a_COLOUR_T_8, "ansi"},
 104    {a_COLOUR_T_1, "1"}, {a_COLOUR_T_1, "mono"}
 105 };
 106
 107 n_CTA(n_COLOUR_CTX_SUM == 0, "Unexpected value of constant");
 108 n_CTA(n_COLOUR_CTX_VIEW == 1, "Unexpected value of constant");
 109 n_CTA(n_COLOUR_CTX_MLE == 2, "Unexpected value of constant");
 110 static char const a_colour_ctx_prefixes[n__COLOUR_CTX_MAX1][8] = {
 111    "sum-", "view-", "mle-"
 112 };
 113
 114 static struct a_colour_map_id const
 115       a_colour_map_ids[n__COLOUR_CTX_MAX1][n__COLOUR_IDS] = {{
 116    {n_COLOUR_CTX_SUM, n_COLOUR_ID_SUM_DOTMARK, a_COLOUR_TT_SUM, "dotmark"},
 117    {n_COLOUR_CTX_SUM, n_COLOUR_ID_SUM_HEADER, a_COLOUR_TT_SUM, "header"},
 118    {n_COLOUR_CTX_SUM, n_COLOUR_ID_SUM_THREAD, a_COLOUR_TT_SUM, "thread"},
 119    }, {
 120    {n_COLOUR_CTX_VIEW, n_COLOUR_ID_VIEW_FROM_, a_COLOUR_TT_NONE, "from_"},
 121    {n_COLOUR_CTX_VIEW, n_COLOUR_ID_VIEW_HEADER, a_COLOUR_TT_VIEW, "header"},
 122    {n_COLOUR_CTX_VIEW, n_COLOUR_ID_VIEW_MSGINFO, a_COLOUR_TT_NONE, "msginfo"},
 123    {n_COLOUR_CTX_VIEW, n_COLOUR_ID_VIEW_PARTINFO, a_COLOUR_TT_NONE, "partinfo"},
 124    }, {
 125    {n_COLOUR_CTX_MLE, n_COLOUR_ID_MLE_POSITION, a_COLOUR_TT_NONE, "position"},
 126    {n_COLOUR_CTX_MLE, n_COLOUR_ID_MLE_PROMPT, a_COLOUR_TT_NONE, "prompt"},
 127 }};
 128 #define a_COLOUR_MAP_SHOW_FIELDWIDTH \
 129    (int)(sizeof("view-")-1 + sizeof("partinfo")-1)
 130
 131 static struct a_colour_g a_colour_g;
 132
 133 /* */
 134 static void a_colour_init(void);
 135
 136 /* Find the type or -1 */
 137 static enum a_colour_type a_colour_type_find(char const *name);
 138
 139 /* `(un)?colour' implementations */
 140 static bool_t a_colour_mux(char **argv);
 141 static bool_t a_colour_unmux(char **argv);
 142
 143 static bool_t a_colour__show(enum a_colour_type ct);
 144 /* (regexpp may be NULL) */
 145 static char const *a_colour__tag_identify(struct a_colour_map_id const *cmip,
 146                      char const *ctag, void **regexpp);
 147
 148 /* Try to find a mapping identity for user given slotname */
 149 static struct a_colour_map_id const *a_colour_map_id_find(char const *slotname);
 150
 151 /* Find an existing mapping for the given combination */
 152 static struct a_colour_map *a_colour_map_find(enum n_colour_id cid,
 153                               enum n_colour_ctx cctx, char const *ctag);
 154
 155 /* In-/Decrement reference counter, destroy if counts gets zero */
 156 #define a_colour_map_ref(SELF) do{ ++(SELF)->cm_refcnt; }while(0)
 157 static void a_colour_map_unref(struct a_colour_map *self);
 158
 159 /* Create an ISO 6429 (ECMA-48/ANSI) terminal control escape sequence from user
 160  * input spec, store it or on error message in *store */
 161 static bool_t a_colour_iso6429(enum a_colour_type ct, char **store,
 162                char const *spec);
 163
 164 static void
 165 a_colour_init(void){
 166    NYD2_ENTER;
 167    a_colour_g.cg_is_init = TRU1;
 168    memcpy(a_colour_g.cg_reset.cp_dat.s = a_colour_g.cg__reset_buf, "\033[0m",
 169       a_colour_g.cg_reset.cp_dat.l = sizeof("\033[0m") -1); /* (calloc) */
 170    a_colour_g.cg_type = a_COLOUR_T_UNKNOWN;
 171    NYD2_LEAVE;
 172 }
 173
 174 static enum a_colour_type
 175 a_colour_type_find(char const *name){
 176    struct a_colour_type_map const *ctmp;
 177    enum a_colour_type rv;
 178    NYD2_ENTER;
 179
 180    ctmp = a_colour_type_maps;
 181    do if(!asccasecmp(ctmp->ctm_name, name)){
 182       rv = ctmp->ctm_type;
 183       goto jleave;
 184    }while(PTRCMP(++ctmp, !=, a_colour_type_maps + n_NELEM(a_colour_type_maps)));
 185
 186    rv = (enum a_colour_type)-1;
 187 jleave:
 188    NYD2_LEAVE;
 189    return rv;
 190 }
 191
 192 static bool_t
 193 a_colour_mux(char **argv){
 194    void *regexp;
 195    char const *mapname, *ctag;
 196    struct a_colour_map **cmap, *blcmp, *lcmp, *cmp;
 197    struct a_colour_map_id const *cmip;
 198    bool_t rv;
 199    enum a_colour_type ct;
 200    NYD2_ENTER;
 201
 202    if((ct = a_colour_type_find(*argv++)) == (enum a_colour_type)-1 &&
 203          (*argv != NULL || !n_is_all_or_aster(argv[-1]))){
 204       n_err(_("`colour': invalid colour type %s\n"),
 205          n_shexp_quote_cp(argv[-1], FAL0));
 206       rv = FAL0;
 207       goto jleave;
 208    }
 209
 210    if(!a_colour_g.cg_is_init)
 211       a_colour_init();
 212
 213    if(*argv == NULL){
 214       rv = a_colour__show(ct);
 215       goto jleave;
 216    }
 217
 218    rv = FAL0;
 219    regexp = NULL;
 220
 221    if((cmip = a_colour_map_id_find(mapname = argv[0])) == NULL){
 222       n_err(_("`colour': non-existing mapping: %s\n"),
 223          n_shexp_quote_cp(mapname, FAL0));
 224       goto jleave;
 225    }
 226
 227    if(argv[1] == NULL){
 228       n_err(_("`colour': %s: missing attribute argument\n"),
 229          n_shexp_quote_cp(mapname, FAL0));
 230       goto jleave;
 231    }
 232
 233    /* Check whether preconditions are at all allowed, verify them as far as
 234     * possible as necessary.  For shell_quote() simplicity let's just ignore an
 235     * empty precondition */
 236    if((ctag = argv[2]) != NULL && *ctag != '\0'){
 237       char const *xtag;
 238
 239       if(cmip->cmi_tt == a_COLOUR_TT_NONE){
 240          n_err(_("`colour': %s does not support preconditions\n"),
 241             n_shexp_quote_cp(mapname, FAL0));
 242          goto jleave;
 243       }else if((xtag = a_colour__tag_identify(cmip, ctag, &regexp)) ==
 244             n_COLOUR_TAG_ERR){
 245          /* I18N: ..of colour mapping */
 246          n_err(_("`colour': %s: invalid precondition: %s\n"),
 247             n_shexp_quote_cp(mapname, FAL0), n_shexp_quote_cp(ctag, FAL0));
 248          goto jleave;
 249       }
 250       ctag = xtag;
 251    }
 252
 253    /* At this time we have all the information to be able to query whether such
 254     * a mapping is yet established. If so, destroy it */
 255    for(blcmp = lcmp = NULL,
 256             cmp = *(cmap =
 257                   &a_colour_g.cg_maps[ct][cmip->cmi_ctx][cmip->cmi_id]);
 258          cmp != NULL; blcmp = lcmp, lcmp = cmp, cmp = cmp->cm_next){
 259       char const *xctag = cmp->cm_tag;
 260
 261       if(xctag == ctag ||
 262             (ctag != NULL && !a_COLOUR_TAG_IS_SPECIAL(ctag) &&
 263              xctag != NULL && !a_COLOUR_TAG_IS_SPECIAL(xctag) &&
 264              !strcmp(xctag, ctag))){
 265          if(lcmp == NULL)
 266             *cmap = cmp->cm_next;
 267          else
 268             lcmp->cm_next = cmp->cm_next;
 269          a_colour_map_unref(cmp);
 270          break;
 271       }
 272    }
 273
 274    /* Create mapping */
 275    /* C99 */{
 276       size_t tl, ul, cl;
 277       char *bp, *cp;
 278
 279       if(!a_colour_iso6429(ct, &cp, argv[1])){
 280          /* I18N: colour command: mapping: error message: user argument */
 281          n_err(_("`colour': %s: %s: %s\n"), n_shexp_quote_cp(mapname, FAL0),
 282             cp, n_shexp_quote_cp(argv[1], FAL0));
 283          goto jleave;
 284       }
 285
 286       tl = (ctag != NULL && !a_COLOUR_TAG_IS_SPECIAL(ctag)) ? strlen(ctag) : 0;
 287       cmp = n_alloc(n_VSTRUCT_SIZEOF(struct a_colour_map, cm_buf) +
 288             tl +1 + (ul = strlen(argv[1])) +1 + (cl = strlen(cp)) +1);
 289
 290       /* .cm_buf stuff */
 291       cmp->cm_pen.cp_dat.s = bp = cmp->cm_buf;
 292       cmp->cm_pen.cp_dat.l = cl;
 293       memcpy(bp, cp, ++cl);
 294       bp += cl;
 295
 296       cmp->cm_user_off = (ui32_t)PTR2SIZE(bp - cmp->cm_buf);
 297       memcpy(bp, argv[1], ++ul);
 298       bp += ul;
 299
 300       if(tl > 0){
 301          cmp->cm_tag = bp;
 302          memcpy(bp, ctag, ++tl);
 303          /*bp += tl;*/
 304       }else
 305          cmp->cm_tag = ctag;
 306
 307       /* Non-buf stuff; default mapping */
 308       if(lcmp != NULL){
 309          /* Default mappings must be last */
 310          if(ctag == NULL){
 311             while(lcmp->cm_next != NULL)
 312                lcmp = lcmp->cm_next;
 313          }else if(lcmp->cm_next == NULL && lcmp->cm_tag == NULL){
 314             if((lcmp = blcmp) == NULL)
 315                goto jlinkhead;
 316          }
 317          cmp->cm_next = lcmp->cm_next;
 318          lcmp->cm_next = cmp;
 319       }else{
 320 jlinkhead:
 321          cmp->cm_next = *cmap;
 322          *cmap = cmp;
 323       }
 324       cmp->cm_cmi = cmip;
 325 #ifdef HAVE_REGEX
 326       cmp->cm_regex = regexp;
 327 #endif
 328       cmp->cm_refcnt = 0;
 329       a_colour_map_ref(cmp);
 330    }
 331    rv = TRU1;
 332 jleave:
 333    NYD2_LEAVE;
 334    return rv;
 335 }
 336
 337 static bool_t
 338 a_colour_unmux(char **argv){
 339    char const *mapname, *ctag, *xtag;
 340    struct a_colour_map **cmap, *lcmp, *cmp;
 341    struct a_colour_map_id const *cmip;
 342    enum a_colour_type ct;
 343    bool_t aster, rv;
 344    NYD2_ENTER;
 345
 346    rv = TRU1;
 347    aster = FAL0;
 348
 349    if((ct = a_colour_type_find(*argv++)) == (enum a_colour_type)-1){
 350       if(!n_is_all_or_aster(argv[-1])){
 351          n_err(_("`uncolour': invalid colour type %s\n"),
 352             n_shexp_quote_cp(argv[-1], FAL0));
 353          rv = FAL0;
 354          goto j_leave;
 355       }
 356       aster = TRU1;
 357       ct = 0;
 358    }
 359
 360    mapname = argv[0];
 361    ctag = argv[1];
 362
 363    if(!a_colour_g.cg_is_init)
 364       goto jemap;
 365
 366    /* Delete anything? */
 367 jredo:
 368    if(ctag == NULL && mapname[0] == '*' && mapname[1] == '\0'){
 369       size_t i1, i2;
 370       struct a_colour_map *tmp;
 371
 372       for(i1 = 0; i1 < n__COLOUR_CTX_MAX1; ++i1)
 373          for(i2 = 0; i2 < n__COLOUR_IDS; ++i2)
 374             for(cmp = *(cmap = &a_colour_g.cg_maps[ct][i1][i2]), *cmap = NULL;
 375                   cmp != NULL;){
 376                tmp = cmp;
 377                cmp = cmp->cm_next;
 378                a_colour_map_unref(tmp);
 379             }
 380    }else{
 381       if((cmip = a_colour_map_id_find(mapname)) == NULL){
 382          rv = FAL0;
 383 jemap:
 384          /* I18N: colour command, mapping and precondition (option in quotes) */
 385          n_err(_("`uncolour': non-existing mapping: %s%s%s\n"),
 386             n_shexp_quote_cp(mapname, FAL0), (ctag == NULL ? n_empty : " "),
 387             (ctag == NULL ? n_empty : n_shexp_quote_cp(ctag, FAL0)));
 388          goto jleave;
 389       }
 390
 391       if((xtag = ctag) != NULL){
 392          if(cmip->cmi_tt == a_COLOUR_TT_NONE){
 393             n_err(_("`uncolour': %s does not support preconditions\n"),
 394                n_shexp_quote_cp(mapname, FAL0));
 395             rv = FAL0;
 396             goto jleave;
 397          }else if((xtag = a_colour__tag_identify(cmip, ctag, NULL)) ==
 398                n_COLOUR_TAG_ERR){
 399             n_err(_("`uncolour': %s: invalid precondition: %s\n"),
 400                n_shexp_quote_cp(mapname, FAL0), n_shexp_quote_cp(ctag, FAL0));
 401             rv = FAL0;
 402             goto jleave;
 403          }
 404          /* (Improve user experience) */
 405          if(xtag != NULL && !a_COLOUR_TAG_IS_SPECIAL(xtag))
 406             ctag = xtag;
 407       }
 408
 409       lcmp = NULL;
 410       cmp = *(cmap = &a_colour_g.cg_maps[ct][cmip->cmi_ctx][cmip->cmi_id]);
 411       for(;;){
 412          char const *xctag;
 413
 414          if(cmp == NULL){
 415             rv = FAL0;
 416             goto jemap;
 417          }
 418          if((xctag = cmp->cm_tag) == ctag)
 419             break;
 420          if(ctag != NULL && !a_COLOUR_TAG_IS_SPECIAL(ctag) &&
 421                xctag != NULL && !a_COLOUR_TAG_IS_SPECIAL(xctag) &&
 422                !strcmp(xctag, ctag))
 423             break;
 424          lcmp = cmp;
 425          cmp = cmp->cm_next;
 426       }
 427
 428       if(lcmp == NULL)
 429          *cmap = cmp->cm_next;
 430       else
 431          lcmp->cm_next = cmp->cm_next;
 432       a_colour_map_unref(cmp);
 433    }
 434
 435 jleave:
 436    if(aster && ++ct != a_COLOUR_T_NONE)
 437       goto jredo;
 438 j_leave:
 439    NYD2_LEAVE;
 440    return rv;
 441 }
 442
 443 static bool_t
 444 a_colour__show(enum a_colour_type ct){
 445    struct a_colour_map *cmp;
 446    size_t i1, i2;
 447    bool_t rv;
 448    NYD2_ENTER;
 449
 450    /* Show all possible types? */
 451    if((rv = (ct == (enum a_colour_type)-1 ? TRU1 : FAL0)))
 452       ct = 0;
 453 jredo:
 454    for(i1 = 0; i1 < n__COLOUR_CTX_MAX1; ++i1)
 455       for(i2 = 0; i2 < n__COLOUR_IDS; ++i2){
 456          if((cmp = a_colour_g.cg_maps[ct][i1][i2]) == NULL)
 457             continue;
 458
 459          while(cmp != NULL){
 460             char const *tagann, *tag;
 461
 462             tagann = n_empty;
 463             if((tag = cmp->cm_tag) == NULL)
 464                tag = n_empty;
 465             else if(tag == n_COLOUR_TAG_SUM_DOT)
 466                tag = "dot";
 467             else if(tag == n_COLOUR_TAG_SUM_OLDER)
 468                tag = "older";
 469 #ifdef HAVE_REGEX
 470             else if(cmp->cm_regex != NULL)
 471                tagann = "[rx] ";
 472 #endif
 473             fprintf(n_stdout, "colour %s %-*s %s %s%s\n",
 474                a_colour_types[ct], a_COLOUR_MAP_SHOW_FIELDWIDTH,
 475                savecat(a_colour_ctx_prefixes[i1],
 476                   a_colour_map_ids[i1][i2].cmi_name),
 477                (char const*)cmp->cm_buf + cmp->cm_user_off,
 478                tagann, n_shexp_quote_cp(tag, TRU1));
 479             cmp = cmp->cm_next;
 480          }
 481       }
 482
 483    if(rv && ++ct != a_COLOUR_T_NONE)
 484       goto jredo;
 485    rv = TRU1;
 486    NYD2_LEAVE;
 487    return rv;
 488 }
 489
 490 static char const *
 491 a_colour__tag_identify(struct a_colour_map_id const *cmip, char const *ctag,
 492       void **regexpp){
 493    NYD2_ENTER;
 494    n_UNUSED(regexpp);
 495
 496    if((cmip->cmi_tt & a_COLOUR_TT_DOT) && !asccasecmp(ctag, "dot"))
 497       ctag = n_COLOUR_TAG_SUM_DOT;
 498    else if((cmip->cmi_tt & a_COLOUR_TT_OLDER) && !asccasecmp(ctag, "older"))
 499       ctag = n_COLOUR_TAG_SUM_OLDER;
 500    else if(cmip->cmi_tt & a_COLOUR_TT_HEADERS){
 501       char *cp, c;
 502       size_t i;
 503
 504       /* Can this be a valid list of headers?  However, with regular expressions
 505        * simply use the input as such if it appears to be a regex */
 506 #ifdef HAVE_REGEX
 507       if(n_is_maybe_regex(ctag)){
 508          int s;
 509
 510          if(regexpp != NULL &&
 511                (s = regcomp(*regexpp = n_alloc(sizeof(regex_t)), ctag,
 512                   REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0){
 513             n_err(_("`colour': invalid regular expression: %s: %s\n"),
 514                n_shexp_quote_cp(ctag, FAL0), n_regex_err_to_doc(NULL, s));
 515             n_free(*regexpp);
 516             goto jetag;
 517          }
 518       }else
 519 #endif
 520       {
 521          /* Normalize to lowercase and strip any whitespace before use */
 522          i = strlen(ctag);
 523          cp = n_autorec_alloc(i +1);
 524
 525          for(i = 0; (c = *ctag++) != '\0';){
 526             bool_t isblspc = blankspacechar(c);
 527
 528             if(!isblspc && !alnumchar(c) && c != '-' && c != ',')
 529                goto jetag;
 530             /* Since we compare header names as they come from the message this
 531              * lowercasing is however redundant: we need to asccasecmp() them */
 532             if(!isblspc)
 533                cp[i++] = lowerconv(c);
 534          }
 535          cp[i] = '\0';
 536          ctag = cp;
 537       }
 538    }else
 539 jetag:
 540       ctag = n_COLOUR_TAG_ERR;
 541    NYD2_LEAVE;
 542    return ctag;
 543 }
 544
 545 static struct a_colour_map_id const *
 546 a_colour_map_id_find(char const *cp){
 547    size_t i;
 548    struct a_colour_map_id const (*cmip)[n__COLOUR_IDS], *rv;
 549    NYD2_ENTER;
 550
 551    rv = NULL;
 552
 553    for(i = 0;; ++i){
 554       if(i == n__COLOUR_IDS)
 555          goto jleave;
 556       else{
 557          size_t j = strlen(a_colour_ctx_prefixes[i]);
 558          if(!ascncasecmp(cp, a_colour_ctx_prefixes[i], j)){
 559             cp += j;
 560             break;
 561          }
 562       }
 563    }
 564    cmip = &a_colour_map_ids[i];
 565
 566    for(i = 0;; ++i){
 567       if(i == n__COLOUR_IDS || (rv = &(*cmip)[i])->cmi_name[0] == '\0'){
 568          rv = NULL;
 569          break;
 570       }
 571       if(!asccasecmp(cp, rv->cmi_name))
 572          break;
 573    }
 574 jleave:
 575    NYD2_LEAVE;
 576    return rv;
 577 }
 578
 579 static struct a_colour_map *
 580 a_colour_map_find(enum n_colour_id cid, enum n_colour_ctx cctx,
 581       char const *ctag){
 582    struct a_colour_map *cmp;
 583    NYD2_ENTER;
 584
 585    cmp = a_colour_g.cg_maps[a_colour_g.cg_type][cctx][cid];
 586    for(; cmp != NULL; cmp = cmp->cm_next){
 587       char const *xtag = cmp->cm_tag;
 588
 589       if(xtag == ctag)
 590          break;
 591       if(xtag == NULL)
 592          break;
 593       if(ctag == NULL || a_COLOUR_TAG_IS_SPECIAL(ctag))
 594          continue;
 595 #ifdef HAVE_REGEX
 596       if(cmp->cm_regex != NULL){
 597          if(regexec(cmp->cm_regex, ctag, 0,NULL, 0) != REG_NOMATCH)
 598             break;
 599       }else
 600 #endif
 601       if(cmp->cm_cmi->cmi_tt & a_COLOUR_TT_HEADERS){
 602          char *hlist = savestr(xtag), *cp;
 603
 604          while((cp = n_strsep(&hlist, ',', TRU1)) != NULL){
 605             if(!asccasecmp(cp, ctag))
 606                break;
 607          }
 608          if(cp != NULL)
 609             break;
 610       }
 611    }
 612    NYD2_LEAVE;
 613    return cmp;
 614 }
 615
 616 static void
 617 a_colour_map_unref(struct a_colour_map *self){
 618    NYD2_ENTER;
 619    if(--self->cm_refcnt == 0){
 620 #ifdef HAVE_REGEX
 621       if(self->cm_regex != NULL){
 622          regfree(self->cm_regex);
 623          n_free(self->cm_regex);
 624       }
 625 #endif
 626       n_free(self);
 627    }
 628    NYD2_LEAVE;
 629 }
 630
 631 static bool_t
 632 a_colour_iso6429(enum a_colour_type ct, char **store, char const *spec){
 633    struct isodesc{
 634       char id_name[15];
 635       char id_modc;
 636    } const fta[] = {
 637       {"bold", '1'}, {"underline", '4'}, {"reverse", '7'}
 638    }, ca[] = {
 639       {"black", '0'}, {"red", '1'}, {"green", '2'}, {"brown", '3'},
 640       {"blue", '4'}, {"magenta", '5'}, {"cyan", '6'}, {"white", '7'}
 641    }, *idp;
 642    char *xspec, *cp, fg[3], cfg[2 + 2*sizeof("255")];
 643    ui8_t ftno_base, ftno;
 644    bool_t rv;
 645    NYD_ENTER;
 646
 647    rv = FAL0;
 648    /* 0/1 indicate usage, thereafter possibly 256 color sequences */
 649    cfg[0] = cfg[1] = 0;
 650
 651    /* Since we use autorec_alloc(), reuse the n_strsep() buffer also for the
 652     * return value, ensure we have enough room for that */
 653    /* C99 */{
 654       size_t i = strlen(spec) +1;
 655       xspec = n_autorec_alloc(n_MAX(i,
 656             sizeof("\033[1;4;7;38;5;255;48;5;255m")));
 657       memcpy(xspec, spec, i);
 658       spec = xspec;
 659    }
 660
 661    /* Iterate over the colour spec */
 662    ftno = 0;
 663    while((cp = n_strsep(&xspec, ',', TRU1)) != NULL){
 664       char *y, *x = strchr(cp, '=');
 665       if(x == NULL){
 666 jbail:
 667          *store = n_UNCONST(_("invalid attribute list"));
 668          goto jleave;
 669       }
 670       *x++ = '\0';
 671
 672       if(!asccasecmp(cp, "ft")){
 673          if(!asccasecmp(x, "inverse")){
 674             n_OBSOLETE(_("please use reverse for ft= fonts, not inverse"));
 675             x = n_UNCONST("reverse");
 676          }
 677          for(idp = fta;; ++idp)
 678             if(idp == fta + n_NELEM(fta)){
 679                *store = n_UNCONST(_("invalid font attribute"));
 680                goto jleave;
 681             }else if(!asccasecmp(x, idp->id_name)){
 682                if(ftno < n_NELEM(fg))
 683                   fg[ftno++] = idp->id_modc;
 684                else{
 685                   *store = n_UNCONST(_("too many font attributes"));
 686                   goto jleave;
 687                }
 688                break;
 689             }
 690       }else if(!asccasecmp(cp, "fg")){
 691          y = cfg + 0;
 692          goto jiter_colour;
 693       }else if(!asccasecmp(cp, "bg")){
 694          y = cfg + 1;
 695 jiter_colour:
 696          if(ct == a_COLOUR_T_1){
 697             *store = n_UNCONST(_("colours are not allowed"));
 698             goto jleave;
 699          }
 700          /* Maybe 256 color spec */
 701          if(digitchar(x[0])){
 702             ui8_t xv;
 703
 704             if(ct == a_COLOUR_T_8){
 705                *store = n_UNCONST(_("invalid colour for 8-colour mode"));
 706                goto jleave;
 707             }
 708
 709             if((n_idec_ui8_cp(&xv, x, 10, NULL
 710                      ) & (n_IDEC_STATE_EMASK | n_IDEC_STATE_CONSUMED)
 711                   ) != n_IDEC_STATE_CONSUMED){
 712                *store = n_UNCONST(_("invalid 256-colour specification"));
 713                goto jleave;
 714             }
 715             y[0] = 5;
 716             memcpy((y == &cfg[0] ? y + 2 : y + 1 + sizeof("255")), x,
 717                (x[1] == '\0' ? 2 : (x[2] == '\0' ? 3 : 4)));
 718          }else for(idp = ca;; ++idp)
 719             if(idp == ca + n_NELEM(ca)){
 720                *store = n_UNCONST(_("invalid colour attribute"));
 721                goto jleave;
 722             }else if(!asccasecmp(x, idp->id_name)){
 723                y[0] = 1;
 724                y[2] = idp->id_modc;
 725                break;
 726             }
 727       }else
 728          goto jbail;
 729    }
 730
 731    /* Restore our autorec_alloc() buffer, create return value */
 732    xspec = n_UNCONST(spec);
 733    if(ftno > 0 || cfg[0] || cfg[1]){ /* TODO unite/share colour setters */
 734       xspec[0] = '\033';
 735       xspec[1] = '[';
 736       xspec += 2;
 737
 738       for(ftno_base = ftno; ftno > 0;){
 739          if(ftno-- != ftno_base)
 740             *xspec++ = ';';
 741          *xspec++ = fg[ftno];
 742       }
 743
 744       if(cfg[0]){
 745          if(ftno_base > 0)
 746             *xspec++ = ';';
 747          xspec[0] = '3';
 748          if(cfg[0] == 1){
 749             xspec[1] = cfg[2];
 750             xspec += 2;
 751          }else{
 752             memcpy(xspec + 1, "8;5;", 4);
 753             xspec += 5;
 754             for(ftno = 2; cfg[ftno] != '\0'; ++ftno)
 755                *xspec++ = cfg[ftno];
 756          }
 757       }
 758
 759       if(cfg[1]){
 760          if(ftno_base > 0 || cfg[0])
 761             *xspec++ = ';';
 762          xspec[0] = '4';
 763          if(cfg[1] == 1){
 764             xspec[1] = cfg[3];
 765             xspec += 2;
 766          }else{
 767             memcpy(xspec + 1, "8;5;", 4);
 768             xspec += 5;
 769             for(ftno = 2 + sizeof("255"); cfg[ftno] != '\0'; ++ftno)
 770                *xspec++ = cfg[ftno];
 771          }
 772       }
 773
 774       *xspec++ = 'm';
 775    }
 776    *xspec = '\0';
 777    *store = n_UNCONST(spec);
 778    rv = TRU1;
 779 jleave:
 780    NYD_LEAVE;
 781    return rv;
 782 }
 783
 784 FL int
 785 c_colour(void *v){
 786    int rv;
 787    NYD_ENTER;
 788
 789    rv = !a_colour_mux(v);
 790    NYD_LEAVE;
 791    return rv;
 792 }
 793
 794 FL int
 795 c_uncolour(void *v){
 796    int rv;
 797    NYD_ENTER;
 798
 799    rv = !a_colour_unmux(v);
 800    NYD_LEAVE;
 801    return rv;
 802 }
 803
 804 FL void
 805 n_colour_stack_del(struct n_go_data_ctx *gdcp){
 806    struct n_colour_env *vp, *cep;
 807    NYD_ENTER;
 808
 809    vp = gdcp->gdc_colour;
 810    gdcp->gdc_colour = NULL;
 811    gdcp->gdc_colour_active = FAL0;
 812
 813    while((cep = vp) != NULL){
 814       vp = cep->ce_last;
 815
 816       if(cep->ce_current != NULL && cep->ce_outfp == n_stdout){
 817          n_sighdl_t hdl;
 818
 819          hdl = n_signal(SIGPIPE, SIG_IGN);
 820          fwrite(a_colour_g.cg_reset.cp_dat.s, a_colour_g.cg_reset.cp_dat.l, 1,
 821             cep->ce_outfp);
 822          fflush(cep->ce_outfp);
 823          n_signal(SIGPIPE, hdl);
 824       }
 825    }
 826    NYD_LEAVE;
 827 }
 828
 829 FL void
 830 n_colour_env_create(enum n_colour_ctx cctx, FILE *fp, bool_t pager_used){
 831    struct n_colour_env *cep;
 832    NYD_ENTER;
 833
 834    if(!(n_psonce & n_PSO_INTERACTIVE))
 835       goto jleave;
 836
 837    if(!a_colour_g.cg_is_init)
 838       a_colour_init();
 839
 840    /* TODO reset the outer level?  Iff ce_outfp==fp? */
 841    cep = n_autorec_alloc(sizeof *cep);
 842    cep->ce_last = n_go_data->gdc_colour;
 843    cep->ce_enabled = FAL0;
 844    cep->ce_ctx = cctx;
 845    cep->ce_ispipe = pager_used;
 846    cep->ce_outfp = fp;
 847    cep->ce_current = NULL;
 848    n_go_data->gdc_colour_active = FAL0;
 849    n_go_data->gdc_colour = cep;
 850
 851    if(ok_blook(colour_disable) || (pager_used && !ok_blook(colour_pager)))
 852       goto jleave;
 853
 854    if(n_UNLIKELY(a_colour_g.cg_type == a_COLOUR_T_UNKNOWN)){
 855       struct n_termcap_value tv;
 856
 857       if(!n_termcap_query(n_TERMCAP_QUERY_colors, &tv)){
 858          a_colour_g.cg_type = a_COLOUR_T_NONE;
 859          goto jleave;
 860       }else
 861          switch(tv.tv_data.tvd_numeric){
 862          case 256: a_colour_g.cg_type = a_COLOUR_T_256; break;
 863          case 8: a_colour_g.cg_type = a_COLOUR_T_8; break;
 864          case 1: a_colour_g.cg_type = a_COLOUR_T_1; break;
 865          default:
 866             if(n_poption & n_PO_D_V)
 867                n_err(_("Ignoring unsupported termcap entry for Co(lors)\n"));
 868             /* FALLTHRU */
 869          case 0:
 870             a_colour_g.cg_type = a_COLOUR_T_NONE;
 871             goto jleave;
 872          }
 873    }
 874
 875    if(a_colour_g.cg_type == a_COLOUR_T_NONE)
 876       goto jleave;
 877
 878    n_go_data->gdc_colour_active = cep->ce_enabled = TRU1;
 879 jleave:
 880    NYD_LEAVE;
 881 }
 882
 883 FL void
 884 n_colour_env_gut(void){
 885    struct n_colour_env *cep;
 886    NYD_ENTER;
 887
 888    if(!(n_psonce & n_PSO_INTERACTIVE))
 889       goto jleave;
 890
 891    /* TODO v15: Could happen because of jump, causing _stack_del().. */
 892    if((cep = n_go_data->gdc_colour) == NULL)
 893       goto jleave;
 894    n_go_data->gdc_colour_active = ((n_go_data->gdc_colour = cep->ce_last
 895          ) != NULL && cep->ce_last->ce_enabled);
 896
 897    if(cep->ce_current != NULL){
 898       n_sighdl_t hdl;
 899
 900       hdl = n_signal(SIGPIPE, SIG_IGN);
 901       fwrite(a_colour_g.cg_reset.cp_dat.s, a_colour_g.cg_reset.cp_dat.l, 1,
 902          cep->ce_outfp);
 903       n_signal(SIGPIPE, hdl);
 904    }
 905 jleave:
 906    NYD_LEAVE;
 907 }
 908
 909 FL void
 910 n_colour_put(enum n_colour_id cid, char const *ctag){
 911    NYD_ENTER;
 912    if(n_COLOUR_IS_ACTIVE()){
 913       struct n_colour_env *cep;
 914
 915       cep = n_go_data->gdc_colour;
 916
 917       if(cep->ce_current != NULL)
 918          fwrite(a_colour_g.cg_reset.cp_dat.s, a_colour_g.cg_reset.cp_dat.l, 1,
 919             cep->ce_outfp);
 920
 921       if((cep->ce_current = a_colour_map_find(cid, cep->ce_ctx, ctag)) != NULL)
 922          fwrite(cep->ce_current->cm_pen.cp_dat.s,
 923             cep->ce_current->cm_pen.cp_dat.l, 1, cep->ce_outfp);
 924    }
 925    NYD_LEAVE;
 926 }
 927
 928 FL void
 929 n_colour_reset(void){
 930    NYD_ENTER;
 931    if(n_COLOUR_IS_ACTIVE()){
 932       struct n_colour_env *cep;
 933
 934       cep = n_go_data->gdc_colour;
 935
 936       if(cep->ce_current != NULL){
 937          cep->ce_current = NULL;
 938          fwrite(a_colour_g.cg_reset.cp_dat.s, a_colour_g.cg_reset.cp_dat.l, 1,
 939             cep->ce_outfp);
 940       }
 941    }
 942    NYD_LEAVE;
 943 }
 944
 945 FL struct str const *
 946 n_colour_reset_to_str(void){
 947    struct str *rv;
 948    NYD_ENTER;
 949
 950    if(n_COLOUR_IS_ACTIVE())
 951       rv = &a_colour_g.cg_reset.cp_dat;
 952    else
 953       rv = NULL;
 954    NYD_LEAVE;
 955    return rv;
 956 }
 957
 958 FL struct n_colour_pen *
 959 n_colour_pen_create(enum n_colour_id cid, char const *ctag){
 960    struct a_colour_map *cmp;
 961    struct n_colour_pen *rv;
 962    NYD_ENTER;
 963
 964    if(n_COLOUR_IS_ACTIVE() &&
 965          (cmp = a_colour_map_find(cid, n_go_data->gdc_colour->ce_ctx, ctag)
 966           ) != NULL){
 967       union {void *vp; char *cp; struct n_colour_pen *cpp;} u;
 968
 969       u.vp = cmp;
 970       rv = u.cpp;
 971    }else
 972       rv = NULL;
 973    NYD_LEAVE;
 974    return rv;
 975 }
 976
 977 FL void
 978 n_colour_pen_put(struct n_colour_pen *self){
 979    NYD_ENTER;
 980    if(n_COLOUR_IS_ACTIVE()){
 981       union {void *vp; char *cp; struct a_colour_map *cmp;} u;
 982       struct n_colour_env *cep;
 983
 984       cep = n_go_data->gdc_colour;
 985       u.vp = self;
 986
 987       if(u.cmp != cep->ce_current){
 988          if(cep->ce_current != NULL)
 989             fwrite(a_colour_g.cg_reset.cp_dat.s, a_colour_g.cg_reset.cp_dat.l,
 990                1, cep->ce_outfp);
 991
 992          if(u.cmp != NULL)
 993             fwrite(self->cp_dat.s, self->cp_dat.l, 1, cep->ce_outfp);
 994          cep->ce_current = u.cmp;
 995       }
 996    }
 997    NYD_LEAVE;
 998 }
 999
1000 FL struct str const *
1001 n_colour_pen_to_str(struct n_colour_pen *self){
1002    struct str *rv;
1003    NYD_ENTER;
1004
1005    if(n_COLOUR_IS_ACTIVE() && self != NULL)
1006       rv = &self->cp_dat;
1007    else
1008       rv = NULL;
1009    NYD_LEAVE;
1010    return rv;
1011 }
1012 #endif /* HAVE_COLOUR */
1013
1014 /* s-it-mode */