source: trunk/third/pkgconfig/popthelp.c @ 17209

/* (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 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#else
# ifdef _AIX
#  pragma alloca
# endif
#endif

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "popt.h"
#include "poptint.h"

#ifdef _WIN32
#define SLASH '\\'
#else
#define SLASH '/'
#endif

static void displayArgs(poptContext con, enum poptCallbackReason foo, 
                        struct poptOption * key, 
                        const char * arg, void * data) {
    if (key->shortName== '?')
        poptPrintHelp(con, stderr, 0);
    else
        poptPrintUsage(con, stderr, 0);
    exit(0);
}

struct poptOption poptHelpOptions[] = {
    { NULL, '\0', POPT_ARG_CALLBACK, &displayArgs, '\0', NULL },
    { "help", '?', 0, NULL, '?', N_("Show this help message") },
    { "usage", '\0', 0, NULL, 'u', N_("Display brief usage message") },
    { NULL, '\0', 0, NULL, 0 }
} ;

static const char * getArgDescrip(const struct poptOption * opt) {
    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 _(opt->argDescrip);
    return POPT_("ARG");
}

static void singleOptionHelp(FILE * f, int maxLeftCol, 
                             const struct poptOption * opt) {
    int indentLength = maxLeftCol + 5;
    int lineLength = 79 - indentLength;
    const char * help = _(opt->descrip);
    int helpLength;
    const char * ch;
    char format[10];
    char * left = alloca(maxLeftCol + 1);
    const char * argDescrip = getArgDescrip(opt);

    *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); 
        return;
    }

    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);
}

static int maxArgWidth(const struct poptOption * opt) {
    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(opt->arg);
            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);
            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 struct poptOption * opt;

    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->longName || opt->shortName) && 
            !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
            singleOptionHelp(f, left, opt);
        opt++;
    }

    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) {
            if (opt->descrip)
                fprintf(f, "\n%s\n", _(opt->descrip));
            singleTableHelp(f, opt->arg, left);
        }
        opt++;
    }
}

static int showHelpIntro(poptContext con, FILE * f) {
    int len = 6;
    char * fn;

    fprintf(f, POPT_("Usage:"));
    if (!(con->flags & POPT_CONTEXT_KEEP_FIRST)) {
        fn = con->optionStack->argv[0];
        if (strchr(fn, SLASH)) fn = strchr(fn, SLASH) + 1;
        fprintf(f, " %s", fn);
        len += strlen(fn) + 1;
    }

    return len;
}

void poptPrintHelp(poptContext con, FILE * f, 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);
    singleTableHelp(f, con->options, leftColWidth);
}

static int singleOptionUsage(FILE * f, int cursor, 
                              const struct poptOption * opt) {
    int len = 3;
    char shortStr[2];
    const char * item = shortStr;
    const char * argDescrip = getArgDescrip(opt);

    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;
}

int singleTableUsage(FILE * f, int cursor, const struct poptOption * table) {
    const struct poptOption * opt;
    
    opt = table;
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->longName || opt->shortName) && 
            !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
            cursor = singleOptionUsage(f, cursor, opt);
        else if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) 
            cursor = singleTableUsage(f, cursor, opt->arg);
        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 */

    if (!str) {
        str = s;
        memset(str, 0, sizeof(str));
    }

    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(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, int flags) {
    int cursor;

    cursor = showHelpIntro(con, f);
    cursor += showShortOptions(con->options, f, NULL);
    singleTableUsage(f, cursor, con->options);

    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) free(con->otherHelp);
    con->otherHelp = strdup(text);
}