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/* man.c - Read system documentation
*
* Copyright 2019 makepost <makepost@firemail.cc>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/man.html
USE_MAN(NEWTOY(man, "k:M:", TOYFLAG_USR|TOYFLAG_BIN))
config MAN
bool "man"
default n
help
usage: man [-M PATH] [-k STRING] | [SECTION] COMMAND
Read manual page for system command.
-k List pages with STRING in their short description
-M Override $MANPATH
Man pages are divided into 8 sections:
1 commands 2 system calls 3 library functions 4 /dev files
5 file formats 6 games 7 miscellaneous 8 system management
Sections are searched in the order 1 8 3 2 5 4 6 7 unless you specify a
section. Each section has a page called "intro", and there's a global
introduction under "man-pages".
*/
#define FOR_man
#include <toys.h>
GLOBALS(
char *M, *k;
char any, cell, ex, *f, k_done, *line, *m, **sct, **scts, **sufs;
regex_t reg;
)
static void newln()
{
if (FLAG(k)) return;
if (TT.any) putchar('\n');
if (TT.any && TT.cell != 2) putchar('\n'); // gawk alias
TT.any = TT.cell = 0;
}
static void put(char *x)
{
while (*x && (TT.ex || *x != '\n')) TT.any = putchar(*x++);
}
// Substitute with same length or shorter.
static void s(char *x, char *y)
{
int i = strlen(x), j = strlen(y), k, l;
for (k = 0; TT.line[k]; k++) if (!strncmp(x, &TT.line[k], i)) {
memmove(&TT.line[k], y, j);
for (l = k += j; TT.line[l]; l++) TT.line[l] = TT.line[l + i - j];
k--;
}
}
static char start(char *x)
{
return !strncmp(x, TT.line, strlen(x));
}
static void trim(char *x)
{
if (start(x)) while (*x++) TT.line++;
}
static char k(char *s) {
TT.k_done = 2;
if (s) TT.line = s;
return !regexec(&TT.reg, TT.k, 0, 0, 0)||!regexec(&TT.reg, TT.line, 0, 0, 0);
}
static void do_man(char **pline, long len)
{
if (!pline) return newln();
TT.line = *pline;
if (FLAG(k)) {
if (!TT.k_done && !start(".") && !start("'") && k(strstr(*pline, "- ")))
printf("%-20s %s%s", TT.k, "- "+2*(TT.line!=*pline), TT.line);
else if (!TT.k_done && start(".so") && k(basename(*pline + 4)))
printf("%s - See %s", TT.k, TT.line);
} else {
s("\\fB", ""), s("\\fI", ""), s("\\fP", ""), s("\\fR", ""); // bash bold,ita
s("\\(aq", "'"), s("\\(cq", "'"), s("\\(dq", "\""); // bash,rsync quote
s("\\*(lq", "\""), s("\\*(rq", "\""); // gawk quote
s("\\(bu", "*"), s("\\(bv", "|"); // bash symbol
s("\\&", ""), s("\\f(CW", ""); // gawk,rsync fancy
s("\\-", "-"), s("\\(", ""), s("\\^", ""), s("\\e", "\\"); // bash escape
s("\\*(", "#"); // gawk var
if (start(".BR")) trim(".BR "), s(" ", ""); // bash boldpunct
if (start(".IP")) newln(), trim(".IP "); // bash list
if (start(".IR")) trim(".IR "), s(" ", ""); // bash itapunct
trim(".B "); // bash bold
trim(".BI "); // gawk boldita
trim(".FN "); // bash filename
trim(".I "); // bash ita
trim(".if n "); // bash nroff
if (start(".E")) TT.ex = TT.line[2] == 'X'; // stat example
else if (start(".PP")) newln(); // bash paragraph
else if (start(".SM")); // bash small
else if (start(".S")) newln(), put(TT.line + 4), newln(); // bash section
else if (start(".so")) put("See "), put(basename(TT.line + 4)); // lastb
else if (start(".TH")) s("\"", " "), put(TT.line + 4); // gawk,git head
else if (start(".TP")) newln(), TT.cell = 1; // bash table
else if (start(".") || start("\'")); // bash,git garbage
else if (!*TT.line); // emerge
else {
if (TT.cell) TT.cell++;
if (!TT.ex) put(" ");
put(TT.line);
}
}
}
// Open file, decompressing if suffix known.
static int zopen(char *s)
{
int fds[] = {-1, -1};
char **known = TT.sufs, *suf = strrchr(s, '.');
if ((*fds = open(s, O_RDONLY)) == -1) return -1;
while (suf && *known && strcmp(suf, *known++));
if (!suf || !*known) return *fds;
sprintf(toybuf, "%czcat"+2*(suf[1]=='g'), suf[1]);
xpopen_both((char *[]){toybuf, s, 0}, fds);
close(fds[0]);
return fds[1];
}
static char manpath()
{
if (*++TT.sct) return 0;
if (!(TT.m = strsep(&TT.M, ":"))) return 1;
TT.sct = TT.scts;
return 0;
}
// Try opening all the possible file extensions.
static int tryfile(char *name)
{
int dotnum, fd = -1;
char *s = xmprintf("%s/man%s/%s.%s.bz2", TT.m, *TT.sct, name, *TT.sct), **suf;
size_t len = strlen(s) - 4;
for (dotnum = 0; dotnum <= 2; dotnum += 2) {
suf = TT.sufs;
while ((fd == -1) && *suf) strcpy(s + len - dotnum, *suf++), fd = zopen(s);
// Recheck suf in zopen, because for x.1.gz name here it is "".
}
free(s);
return fd;
}
void man_main(void)
{
int fd = -1;
TT.scts = (char *[]) {"1", "8", "3", "2", "5", "4", "6", "7", 0};
TT.sct = TT.scts - 1; // First manpath() read increments.
TT.sufs = (char *[]) {".bz2", ".gz", ".xz", "", 0};
if (!TT.M) TT.M = getenv("MANPATH");
if (!TT.M) TT.M = "/usr/share/man";
if (FLAG(k)) {
char *d, *f;
DIR *dp;
struct dirent *entry;
xregcomp(&TT.reg, TT.k, REG_ICASE|REG_NOSUB);
while (!manpath()) {
d = xmprintf("%s/man%s", TT.m, *TT.sct);
if (!(dp = opendir(d))) continue;
while ((entry = readdir(dp))) {
if (entry->d_name[0] == '.') continue;
f = xmprintf("%s/%s", d, TT.k = entry->d_name);
if (-1 != (fd = zopen(f))) {
TT.k_done = 0;
do_lines(fd, '\n', do_man);
}
free(f);
}
closedir(dp);
free(d);
}
return regfree(&TT.reg);
}
if (!toys.optc) help_exit("which page?");
if (toys.optc == 1) {
if (strchr(*toys.optargs, '/')) fd = zopen(*toys.optargs);
else while ((fd == -1) && !manpath()) fd = tryfile(*toys.optargs);
if (fd == -1) error_exit("no %s", *toys.optargs);
// If they specified a section, look for file in that section
} else {
TT.scts = (char *[]){*toys.optargs, 0}, TT.sct = TT.scts - 1;
while ((fd == -1) && !manpath()) fd = tryfile(toys.optargs[1]);
if (fd == -1) error_exit("section %s no %s", *--TT.sct, toys.optargs[1]);
}
do_lines(fd, '\n', do_man);
}
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