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[ncman] start lexing troff data

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nick black 2021-12-04 13:16:46 -05:00 committed by nick black
parent e24154cd91
commit e9cc8d0b2e
2 changed files with 70 additions and 12 deletions
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1
doc/man/man1/ncman.1.md
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@ -31,5 +31,6 @@ files: Files to render.
**man(1)**,
**notcurses(3)**,
**groff_man(7)**,
**man-pages(7)**,
**unicode(7)**

81
src/man/main.c
View File

@ -66,6 +66,7 @@ map_gzipped_data(unsigned char* buf, size_t* len, unsigned char* ubuf, uint32_t
return ubuf;
}
#else // libz implementation
#error libz not yet implemented, need libdeflate
static unsigned char*
map_gzipped_data(unsigned char* buf, size_t* len, unsigned char* ubuf, uint32_t ulen){
munmap(buf, *len);
@ -123,6 +124,65 @@ get_troff_data(const char *arg, size_t* len){
return buf;
}
// calculate the number of rows necessary to display the troff data,
// assuming the specified width |dimx|.
static int
troff_height(unsigned dimx, const unsigned char* map, size_t mlen){
// FIXME for now we assume infinitely wide lines
int lines = 0;
enum {
LINE_UNKNOWN,
LINE_COMMENT,
LINE_B, LINE_BI, LINE_BR, LINE_I, LINE_IB, LINE_IR,
LINE_RB, LINE_RI, LINE_SB, LINE_SM,
LINE_EE, LINE_EX, LINE_RE, LINE_RS,
LINE_SH, LINE_SS, LINE_TH,
LINE_IP, LINE_LP, LINE_P, LINE_PP,
LINE_TP, LINE_TQ,
LINE_ME, LINE_MT, LINE_UE, LINE_UR,
LINE_OP, LINE_SY, LINE_YS,
} linetype = LINE_UNKNOWN;
const unsigned char comment[] = ".\\\""; // dot slash quot
const unsigned char* comiter = comment;
for(size_t off = 0 ; off < mlen ; ++off){
if(map[off] == '\n'){
if(linetype != LINE_UNKNOWN && linetype != LINE_COMMENT){
++lines;
}
linetype = LINE_UNKNOWN;
comiter = comment;
}else if(linetype == LINE_UNKNOWN){
if(comiter && map[off] == *comiter){
if(*++comiter == '\0'){
linetype = LINE_COMMENT;
}else{
comiter = NULL;
}
}
}
}
if(linetype != LINE_UNKNOWN && linetype != LINE_COMMENT){
++lines;
}
return lines;
}
// we create a plane sized appropriately for the troff data. all we do
// after that is move the plane up and down.
static struct ncplane*
render_troff(struct notcurses* nc, const unsigned char* map, size_t mlen){
unsigned dimy, dimx;
struct ncplane* stdn = notcurses_stddim_yx(nc, &dimy, &dimx);
int rows = troff_height(dimx, map, mlen);
struct ncplane_options popts = {
.rows = rows,
.cols = dimx,
};
struct ncplane* pman = ncplane_create(stdn, &popts);
// FIXME draw it
return pman;
}
static int
manloop(struct notcurses* nc, const char* arg){
size_t len;
@ -130,30 +190,27 @@ manloop(struct notcurses* nc, const char* arg){
if(buf == NULL){
return -1;
}
unsigned dimy, dimx;
struct ncplane* stdn = notcurses_stddim_yx(nc, &dimy, &dimx);
ncplane_printf(stdn, "read %s (%" PRIuPTR "B)", arg, len);
if(notcurses_render(nc)){
munmap(buf, len);
return -1;
}
struct ncplane* page = render_troff(nc, buf, len);
uint32_t key;
ncinput ni;
while((key = notcurses_get(nc, NULL, &ni)) != (uint32_t)-1){
do{
if(notcurses_render(nc)){
munmap(buf, len);
return -1;
}
ncinput ni;
key = notcurses_get(nc, NULL, &ni);
switch(key){
case 'q':
munmap(buf, len);
return 0;
}
}
}while(key != (uint32_t)-1);
munmap(buf, len);
return -1;
}
static int
ncman(struct notcurses* nc, const char* arg){
unsigned dimy, dimx;
struct ncplane* stdn = notcurses_stddim_yx(nc, &dimy, &dimx);
// FIXME usage bar at bottom
return manloop(nc, arg);
}