popthelp.cpp

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 
/* (C) 1998 Red Hat Software, Inc. -- Licensing details are in the COPYING
   file accompanying popt source distributions, available from 
   ftp://ftp.redhat.com/pub/code/popt */
 
#include "../StdAfx.h"
#include "poptint.h"
 
static void displayArgs(poptContext con,
    /*@unused@*/ enum poptCallbackReason /*foo*/,
    struct poptOption * key, 
    /*@unused@*/ const char * /*arg*/, /*@unused@*/ void * /*data*/) {
    if (key->shortName== '?')
        poptPrintHelp(con, stdout, 0);
    else
        poptPrintUsage(con, stdout, 0);
    exit(0);
}
 
struct poptOption poptHelpOptions[] = {
    { NULL, '\0', POPT_ARG_CALLBACK, (void *)&displayArgs, '\0', NULL, NULL },
    { "help", '?', 0, NULL, '?', N_("Show this help message"), NULL },
    { "usage", 'u', 0, NULL, 'u', N_("Display brief usage message"), NULL },
    { NULL, '\0', 0, NULL, 0, NULL, NULL }
} ;
 
 
/*@observer@*/ /*@null@*/ static const char *const
getTableTranslationDomain(const struct poptOption *table)
{
  const struct poptOption *opt;
 
  for(opt = table;
      opt->longName || opt->shortName || opt->arg;
      opt++) {
    if(opt->argInfo == POPT_ARG_INTL_DOMAIN)
      return (const char* const)opt->arg;
  }
 
  return NULL;
}
 
/*@observer@*/ /*@null@*/ static const char *const
getArgDescrip(const struct poptOption * opt, const char *translation_domain)
{
    if (!(opt->argInfo & POPT_ARG_MASK)) return NULL;
 
    if (opt == (poptHelpOptions + 1) || opt == (poptHelpOptions + 2))
  if (opt->argDescrip) return POPT_(opt->argDescrip);
 
    if (opt->argDescrip) return D_(translation_domain, opt->argDescrip);
    return POPT_("ARG");
}
 
static void singleOptionHelp(FILE * f, int maxLeftCol, 
                             const struct poptOption * opt,
                             const char *translation_domain) {
    int indentLength = maxLeftCol + 5;
    int lineLength = 79 - indentLength;
    const char * help = D_(translation_domain, opt->descrip);
    int helpLength;
    const char * ch;
    char format[130];
    char * left;
    const char * argDescrip = getArgDescrip(opt, translation_domain);
    
    left = (char*)malloc(maxLeftCol + 1);
    *left = '\0';
    
    if (opt->longName && opt->shortName)
        sprintf(left, "-%c, --%s", opt->shortName, opt->longName);
    else if (opt->shortName) 
        sprintf(left, "-%c", opt->shortName);
    else if (opt->longName)
        sprintf(left, "--%s", opt->longName);
    if (!*left) return ;
    if (argDescrip) {
        strcat(left, "=");
        strcat(left, argDescrip);
    }
    
    if (help)
        fprintf(f,"  %-*s   ", maxLeftCol, left);
    else {
        fprintf(f,"  %s\n", left); 
        goto out;
    }
    
    helpLength = strlen(help);
    while (helpLength > lineLength) {
        ch = help + lineLength - 1;
        while (ch > help && !isspace(*ch)) ch--;
        if (ch == help) break;    /* give up */
            while (ch > (help + 1) && isspace(*ch)) ch--;
            ch++;
        
        sprintf(format, "%%.%ds\n%%%ds", (int) (ch - help), indentLength);
        fprintf(f, format, help, " ");
        help = ch;
        while (isspace(*help) && *help) help++;
        helpLength = strlen(help);
    }
    
    if (helpLength) fprintf(f, "%s\n", help);
    
    out:
    free(left);
}
 
static int maxArgWidth(const struct poptOption * opt,
           const char * translation_domain) {
    int max = 0;
    int thiS;
    const char * s;
    
    while (opt->longName || opt->shortName || opt->arg) {
  if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) {
      thiS = maxArgWidth((struct poptOption*)opt->arg, translation_domain);
      if (thiS > max) max = thiS;
  } else if (!(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN)) {
      thiS = opt->shortName ? 2 : 0;
      if (opt->longName) {
    if (thiS) thiS += 2;
    thiS += strlen(opt->longName) + 2;
      }
 
      s = getArgDescrip(opt, translation_domain);
      if (s)
    thiS += strlen(s) + 1;
      if (thiS > max) max = thiS;
  }
 
  opt++;
    }
    
    return max;
}
 
static void singleTableHelp(FILE * f, const struct poptOption * table, 
                            int left,
                            const char *translation_domain) {
    const struct poptOption * opt;
    const char *sub_transdom;
    
    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->longName || opt->shortName) && 
            !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
            singleOptionHelp(f, left, opt, translation_domain);
        opt++;
    }
    
    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
    if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) {
        sub_transdom = getTableTranslationDomain((struct poptOption*)opt->arg);
        if(!sub_transdom)
        sub_transdom = translation_domain;
        
        if (opt->descrip)
        fprintf(f, "\n%s\n", D_(sub_transdom, opt->descrip));
 
        singleTableHelp(f, (struct poptOption*)opt->arg, left, sub_transdom);
    }
    opt++;
    }
    
}
 
static int showHelpIntro(poptContext con, FILE * f) {
    int len = 6;
    const char * fn;
 
    fprintf(f, POPT_("Usage:"));
    if (!(con->flags & POPT_CONTEXT_KEEP_FIRST)) {
  fn = con->optionStack->argv[0];
  if (strchr(fn, '/')) fn = strchr(fn, '/') + 1;
  fprintf(f, " %s", fn);
  len += strlen(fn) + 1;
    }
 
    return len;
}
 
void poptPrintHelp(poptContext con, FILE * f, /*@unused@*/ int /*flags*/) {
    int leftColWidth;
    
    showHelpIntro(con, f);
    if (con->otherHelp)
        fprintf(f, " %s\n", con->otherHelp);
    else
        fprintf(f, " %s\n", POPT_("[OPTION...]"));
    
    leftColWidth = maxArgWidth(con->options, NULL);
    singleTableHelp(f, con->options, leftColWidth, NULL);
}
 
static int singleOptionUsage(FILE * f, int cursor, 
           const struct poptOption * opt,
           const char *translation_domain) {
    int len = 3;
    char shortStr[2] = { '\0', '\0' };
    const char * item = shortStr;
    const char * argDescrip = getArgDescrip(opt, translation_domain);
 
    if (opt->shortName) {
  if (!(opt->argInfo & POPT_ARG_MASK)) 
      return cursor;  /* we did these already */
  len++;
  *shortStr = opt->shortName;
  shortStr[1] = '\0';
    } else if (opt->longName) {
  len += 1 + strlen(opt->longName);
  item = opt->longName;
    }
 
    if (len == 3) return cursor;
 
    if (argDescrip) 
  len += strlen(argDescrip) + 1;
 
    if ((cursor + len) > 79) {
  fprintf(f, "\n       ");
  cursor = 7;
    } 
 
    fprintf(f, " [-%s%s%s%s]", opt->shortName ? "" : "-", item,
      argDescrip ? (opt->shortName ? " " : "=") : "",
      argDescrip ? argDescrip : "");
 
    return cursor + len + 1;
}
 
static int singleTableUsage(FILE * f, int cursor, const struct poptOption * table,
         const char *translation_domain) {
    const struct poptOption * opt;
    
    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INTL_DOMAIN)
      translation_domain = (const char *)opt->arg;
  else if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) 
      cursor = singleTableUsage(f, cursor, (struct poptOption*)opt->arg,
              translation_domain);
  else if ((opt->longName || opt->shortName) && 
     !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
    cursor = singleOptionUsage(f, cursor, opt, translation_domain);
 
  opt++;
    }
 
    return cursor;
}
 
static int showShortOptions(const struct poptOption * opt, FILE * f, 
          char * str) {
    char s[300];    /* this is larger then the ascii set, so
           it should do just fine */
 
    s[0] = '\0';
    if (str == NULL) {
  memset(s, 0, sizeof(s));
  str = s;
    }
 
    while (opt->longName || opt->shortName || opt->arg) {
  if (opt->shortName && !(opt->argInfo & POPT_ARG_MASK))
      str[strlen(str)] = opt->shortName;
  else if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE)
      showShortOptions((struct poptOption*)opt->arg, f, str);
 
  opt++;
    } 
 
    if (s != str || !*s)
  return 0;
 
    fprintf(f, " [-%s]", s);
    return strlen(s) + 4;
}
 
void poptPrintUsage(poptContext con, FILE * f, /*@unused@*/ int /*flags*/) {
    int cursor;
 
    cursor = showHelpIntro(con, f);
    cursor += showShortOptions(con->options, f, NULL);
    singleTableUsage(f, cursor, con->options, NULL);
 
    if (con->otherHelp) {
  cursor += strlen(con->otherHelp) + 1;
  if (cursor > 79) fprintf(f, "\n       ");
  fprintf(f, " %s", con->otherHelp);
    }
 
    fprintf(f, "\n");
}
 
void poptSetOtherOptionHelp(poptContext con, const char * text) {
    if (con->otherHelp) xfree(con->otherHelp);
    con->otherHelp = xstrdup(text);
}