[mmh] / sbr / context_read.c

/*
** context_read.c -- find and read profile and context files
**
** This code is Copyright (c) 2002, by the authors of nmh.  See the
** COPYRIGHT file in the root directory of the nmh distribution for
** complete copyright information.
**
** This function must be called early on in any nmh utility, and
** may only be called once.  It does the following:
**
**  o  Sets the global variables to absolute paths:
**     - "mypath": home directory (HOME)
**     - "mmhpath": mmh directory (MMH)
**     - "defpath": profile file (MMHP)
**     - "ctxpath": context file (MMHC)
**
**  o  Reads in the profile file.  Bails out if it can't.
**
**  o  Makes sure that the mail directory exists, prompting for
**     creation if it doesn't.
**
**  o  Reads the context file.
**
** You might need to adjust uip/mmh.sh if you make changes here.
*/

#include <h/mh.h>    /* mh internals */
#include <errno.h>   /* system call errors */
#include <pwd.h>     /* structure for getpwuid() results */
#include <unistd.h>
#include <sys/stat.h>

void
context_read(void)
{
        char buf[BUFSIZ];            /* path name buffer                 */
        char *cp;                    /* miscellaneous pointer            */
        char *nd;                    /* nmh directory pointer            */
        struct stat st;              /* stat() results                   */
        register struct passwd *pw;  /* getpwuid() results               */
        register FILE *ib;           /* profile and context file pointer */

        /*
        ** If this routine _is_ called again (despite the wanings in the
        ** comments above), return immediately.
        */
        if (m_defs) {
                return;
        }

        /*
        ** Find user's home directory. Try the HOME environment variable first,
        ** the home directory field in the password file if that's not found.
        */
        if (!(mypath = getenv("HOME"))) {
                if (!(pw = getpwuid(getuid())) || !*pw->pw_dir) {
                        adios(NULL, "cannot determine your home directory");
                }
                mypath = pw->pw_dir;
        }

        /*
        ** set mmhpath
        */
        if ((cp = getenv("MMH")) && *cp) {
                mmhpath = getcpy(expanddir(cp));  /* rel to cwd */
                if (stat(mmhpath, &st) != -1 && (st.st_mode & S_IFDIR) == 0) {
                        adios(NULL, "`%s' specified by your MMH environment variable is not a directory", cp);
                }
        } else {
                mmhpath = concat(mypath, "/", mmhdir, NULL);
                if (stat(mmhpath, &st) == -1 || (st.st_mode & S_IFDIR) == 0) {
                        adios(NULL, "Doesn't look like mmh is set up for your account.  Run `mmh' to do so.");
                }
        }

        /*
        ** Find and read user's profile.  Check for the existence of
        ** a non-empty MMHP environment variable first.  Look for the
        ** profile in the mmh directory otherwise.
        */
        if ((cp = getenv("MMHP")) && *cp) {
                if (*cp == '/') {
                        defpath = getcpy(cp);
                } else {
                        defpath = concat(mmhpath, "/", cp, NULL);
                }
                if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0) {
                        adios(NULL, "Your profile `%s', specified by the MMHP environment variable, is not a normal file", cp);
                }
                if ((ib = fopen(defpath, "r")) == (FILE *)0) {
                        adios(NULL, "Unable to read your profile `%s', specified by the MMHP environment variable", defpath);
                }
        } else {
                defpath = concat(mmhpath, "/", profile, NULL);
                if ((ib = fopen(defpath, "r")) == (FILE *)0) {
                        adios(NULL, "No profile found. Please create `%s' first.", defpath);
                }
                cp = profile;
        }
        readconfig(&m_defs, ib, cp, 0);
        fclose(ib);

        /*
        ** Find the user's mail storage directory, which is specified by
        ** the `Path' profile component.  Convert a relative path name
        ** to an absolute one rooted in the home directory.
        */
        if ((cp = context_find("path")) == NULL) {
                adios(NULL, "Your profile `%s' does not contain the required path entry.", defpath);
        }
        if (!*cp) {
                adios(NULL, "The Path entry of your profile `%s' must be non-empty.", defpath);
        }
        if (*cp == '/') {
                nd = cp;
        } else {
                snprintf(nd = buf, sizeof buf, "%s/%s", mypath, cp);
        }
        if (stat(nd, &st) == -1) {
                if (errno != ENOENT) {
                        adios(nd, "error opening");
                }
                cp = concat("Your mail storage directory `", nd, "' doesn't exist; Create it? ", NULL);
                if (!getanswer(cp)) {
                        adios(NULL, "Unable to access the mail storage directory `%s'", nd);
                }
                free(cp);
                if (!makedir(nd)) {
                        adios(nd, "unable to create");
                }
        } else if ((st.st_mode & S_IFDIR) == 0) {
                adios(NULL, "Your mail storage `%s' is not a directory", nd);
        }
        /*
        ** Create the default folder (inbox)
        */
        cp = toabsdir(defaultfolder);
        if (stat(cp, &st) == -1) {
                if (!makedir(cp)) {
                        adios(cp, "Unable to create the default folder");
                }
        } else if ((st.st_mode & S_IFDIR) == 0) {
                adios(NULL, "The default folder `%s' is not a directory", cp);
        }

        /*
        ** Open and read user's context file.  The name of the context
        ** file comes from the profile unless overridden by the MMHC
        ** environment variable.
        */
        if (!(cp = getenv("MMHC")) || !*cp) {
                if (!(cp = context_find("context")) || !*cp) {
                        cp = context;
                }
        }

        /*
        ** context is NULL if the use of the context was diabled.
        ** We also support users setting explicitly setting
        ** MMHC to /dev/null.  (If this wasn't special-cased then the
        ** locking would be liable to fail.)
        */
        if (!context || (strcmp(cp, "/dev/null") == 0)) {
                ctxpath = NULL;
                return;
        }

        if (*cp == '/') {
                ctxpath = getcpy(cp);
        } else {
                ctxpath = concat(mmhpath, "/", cp, NULL);
        }
        if ((ib = lkfopen(ctxpath, "r"))) {
                readconfig((struct node **) 0, ib, cp, 1);
                lkfclose(ib, ctxpath);
        }

        /* Set editor */
        if (!(cp = getenv("MMHEDITOR")) || !*cp) {
                if (!(cp = context_find("editor")) || !*cp) {
                        if (!(cp = getenv("VISUAL")) || !*cp) {
                                if (!(cp = getenv("EDITOR")) || !*cp) {
                                        cp = defaulteditor;
                                }
                        }
                }
        }
        defaulteditor = cp;

        /* Set pager */
        if (!(cp = getenv("MMHPAGER")) || !*cp) {
                if (!(cp = context_find("pager")) || !*cp) {
                        if (!(cp = getenv("PAGER")) || !*cp) {
                                cp = defaultpager;
                        }
                }
        }
        defaultpager = cp;
}