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#include <libterm/terminal.h>
#include <knob/block.h>
#include <knob/task.h>
#include <pland/pcrt.h>
#include "cmds.h"
#include "term.h"
#include "vars.h"
#define LINE_SIZE 4096
static char line[LINE_SIZE];
static inline uint8_t hex_to_int(char ch) {
return ch - (ch <= '9' ? '0' : 'a' - 10);
}
void ensure_color() {
const struct no_null_sn *fg = get_var((struct no_null_sn){.data = "_color_fg", .length = 9});
const struct no_null_sn *bg = get_var((struct no_null_sn){.data = "_color_bg", .length = 9});
if (fg && bg)
term_set_color(
(hex_to_int(fg->data[0]) << 4) | hex_to_int(fg->data[1]),
(hex_to_int(bg->data[0]) << 4) | hex_to_int(bg->data[1])
);
}
static void line_replace(const char *from) {
const char *fi = from;
char *ti = line;
while (*fi) {
if (ti == line + LINE_SIZE) {
term_add_sz("Line too long.\n");
term_paint();
line[0] = '\0';
return;
}
if (*fi != '$') {
*ti = *fi;
++ti;
++fi;
continue;
}
const char *var_start = ++fi;
const char *var_end = var_start;
while (*var_end != '$')
if (!*var_end++) {
if (var_end - fi > 10)
term_addf("Unterminated variable at\"%10s...\".\n", fi);
else
term_addf("Unterminated variable at \"%s\".\n", fi);
term_paint();
line[0] = '\0';
return;
}
if (ti + (var_end - var_start) >= line + LINE_SIZE) {
term_add_sz("Line too long.\n");
term_paint();
line[0] = '\0';
return;
}
struct no_null_sn vname = {
.data = var_start,
.length = var_end - var_start
};
const struct no_null_sn *vval = get_var(vname);
if (!vval)
vval = &vname;
blockcpy(ti, vval->data, vval->length);
ti += vval->length;
fi = var_end + 1;
}
*ti = '\0';
}
void run_line(const char *original_line) {
line_replace(original_line);
if (!*line)
return;
const char *space;
for (space = line; *space && (*space != ' '); ++space)
;
if (blockequ(line, "source ", 7))
source(space + 1);
else if (blockequ(line, "set ", 4)) {
set(space + 1);
ensure_color();
}
else if (blockequ(line, "echo ", 5)) {
term_add_sz(space + 1);
term_add_char('\n');
term_paint();
}
else if (blockequ(line, "vars", 5))
dump_vars();
else if (blockequ(line, "quit", 5))
__pcrt_quit();
else if (blockequ(line, "clear", 6)) {
term_clear();
term_paint();
}
else if (blockequ(line, "help", 5)) {
term_add_sz("Highway is a command shell for Portland OS. It includes variable support and a couple of pseudo-commands. Variables are addressed by surrounding with \"$\". The following list shows each of the pseudo-commands.\n\n"
" source FILE\t" "run each command in FILE\n"
" clear\t\t\t" "clear the screen\n"
" echo STRING\t" "print STRING\n"
" set VAR VALUE\t" "set $VAR$ to VALUE\n"
" vars\t\t\t" "dump variables\n"
" quit\t\t\t" "exit highway\n"
" help\t\t\t" "show this\n");
term_paint();
}
else if (!try_run_command_blocking(line, stdio_task)) {
const struct no_null_sn *path = get_var((struct no_null_sn){.data = "_path", .length = 5});
if (!path->length) {
term_add_sz("Could not run command.\n");
term_paint();
return;
}
for (uint16_t to_i = LINE_SIZE - 1; to_i >= path->length; --to_i)
line[to_i] = line[to_i - path->length];
blockcpy(line, path->data, path->length);
if (!try_run_command_blocking(line, stdio_task)) {
term_add_sz("Could not run command.\n");
term_paint();
return;
}
else {
_yield_task();
term_add_char('\n');
ensure_color();
}
}
else {
_yield_task();
ensure_color();
}
}
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