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climenu.c
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climenu.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <time.h>
#include <termios.h>
#include <stdint.h>
#define COLOR_DEFAULT ""
#define COLOR_RESET "\033[0m"
#define COLOR_FG_BLACK "\033[30m"
#define COLOR_FG_RED "\033[31m"
#define COLOR_FG_GREEN "\033[32m"
#define COLOR_FG_YELLOW "\033[33m"
#define COLOR_FG_BLUE "\033[34m"
#define COLOR_FG_MAGENTA "\033[35m"
#define COLOR_FG_CYAN "\033[36m"
#define COLOR_FG_WHITE "\033[37m"
#define COLOR_BG_BLACK "\033[40m"
#define COLOR_BG_RED "\033[41m"
#define COLOR_BG_GREEN "\033[42m"
#define COLOR_BG_YELLOW "\033[43m"
#define COLOR_BG_BLUE "\033[44m"
#define COLOR_BG_MAGENTA "\033[45m"
#define COLOR_BG_CYAN "\033[46m"
#define COLOR_BG_WHITE "\033[47m"
#define ALLOCSIZ 64
/* Key codes */
#define KEY_J 0x6A
#define KEY_K 0x6B
#define KEY_DOWN 0x425B1B
#define KEY_UP 0x415B1B
#define KEY_ENTER 0xD
#define KEY_SPACE 0x20
#define KEY_Q 0x71
#define KEY_CTRLC 0x03
#define PROPERTY(key_str) {.key = key_str, .val = NULL }
#define COUNT_OF(arr) (sizeof arr / sizeof *arr)
void select_next(void);
void select_prev(void);
void clean_exit(void);
enum ColorMode {
CM_NONE = 0,
CM_SELECTED
};
enum EntryType {
ET_NONE = 0,
ET_REG,
ET_HEADER
};
struct EntryKey {
char* key;
char* val;
int type;
};
struct Entry {
struct Entry* next;
struct Entry* prev;
struct EntryKey* keys;
size_t keys_count;
size_t index;
char type;
};
struct EntryKey g_parameter_keys[] = {
PROPERTY("str"),
PROPERTY("fgcolor"),
PROPERTY("bgcolor"),
PROPERTY("exec"),
PROPERTY("colormode"),
PROPERTY("wait"),
PROPERTY("exit"),
PROPERTY("runstr")
};
struct Entry* g_selected = NULL;
struct Entry* g_head = NULL;
size_t g_entry_count = 0;
struct termios g_termios_original;
struct winsize g_window;
void error_exit(char* msg) {
printf("%s\n", msg);
exit(EXIT_FAILURE);
}
void* xrealloc(void* buf, size_t size) {
buf = realloc(buf, size);
if (buf == NULL)
error_exit("realloc failed");
return buf;
}
void* xmalloc(size_t size) {
void* ptr = malloc(size);
if (ptr == NULL)
error_exit("malloc failed");
return ptr;
}
void* xcalloc(size_t n, size_t size) {
void* ptr = calloc(n, size);
if (ptr == NULL)
error_exit("calloc failed");
return ptr;
}
int sleep_ms(long ms) {
struct timespec ts;
int res;
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000;
do {
res = nanosleep(&ts, &ts);
} while (res);
return res;
}
void clear_screen(void) {
system("clear");
}
size_t get_filesize(FILE* file_ptr) {
size_t size;
fseek(file_ptr, 0, SEEK_END);
size = ftell(file_ptr);
rewind(file_ptr);
return size;
}
char* read_file(char* path) {
FILE* file_ptr;
size_t file_size;
char* buf;
file_ptr = fopen(path, "r");
if (file_ptr == NULL)
error_exit("failed to open file");
file_size = get_filesize(file_ptr);
buf = xcalloc(1, file_size + 1);
fread(buf, 1, file_size, file_ptr);
fclose(file_ptr);
return buf;
}
char* read_stdin(void) {
char* buf = NULL;
char ch;
size_t i, allocated_size;
i = allocated_size = 0;
while ((ch = getchar()) != EOF) {
if (i >= allocated_size) {
allocated_size += ALLOCSIZ;
buf = xrealloc(buf, allocated_size);
}
buf[i++] = ch;
}
if (i >= allocated_size)
buf = xrealloc(buf, allocated_size + 1);
buf[i] = '\0';
/* Set stdin to tty input */
freopen("/dev/tty", "r", stdin);
return buf;
}
int string_startswith(char* a, char* b) {
while (*a) {
if (*b == '\0')
return 1;
if (*(a++) != *(b++))
return 0;
}
return 1;
}
char* string_dup(char* str) {
char* new_str = xcalloc(1, strlen(str) + 1);
strcpy(new_str, str);
return new_str;
}
char* next_line(char* ptr) {
while (*ptr && *(ptr++) != '\n')
;
return (*ptr) ? ptr : NULL;
}
char* get_value(char* ptr) {
char buf[BUFSIZ] = {0};
while (*(ptr++) && *(ptr - 1) != '=')
;
for (int i = 0; i < BUFSIZ - 1 && *ptr && *ptr != '\n'; ++i)
buf[i] = *(ptr++);
return string_dup(buf);
}
struct Entry* entry_create(enum EntryType type) {
struct Entry* new_entry = xcalloc(1, sizeof *new_entry);;
new_entry->type = type;
new_entry->index = g_entry_count++;
return new_entry;
}
void entry_append(struct Entry* head, struct Entry* node) {
while (head->next)
head = head->next;
head->next = node;
node->prev = head;
}
void entry_destroy(struct Entry* entry) {
if (entry->keys)
for (size_t i = 0; i < entry->keys_count; ++i)
free(entry->keys[i].val);
free(entry->keys);
free(entry);
}
char* parse_color(char* color, int fg) {
if (color == NULL)
return NULL;
if (strcmp(color, "black") == 0) return fg ? COLOR_FG_BLACK : COLOR_BG_BLACK;
if (strcmp(color, "blue") == 0) return fg ? COLOR_FG_BLUE : COLOR_BG_BLUE;
if (strcmp(color, "cyan") == 0) return fg ? COLOR_FG_CYAN : COLOR_BG_CYAN;
if (strcmp(color, "green") == 0) return fg ? COLOR_FG_GREEN : COLOR_BG_GREEN;
if (strcmp(color, "magenta") == 0) return fg ? COLOR_FG_MAGENTA : COLOR_BG_MAGENTA;
if (strcmp(color, "red") == 0) return fg ? COLOR_FG_RED : COLOR_BG_RED;
if (strcmp(color, "white") == 0) return fg ? COLOR_FG_WHITE : COLOR_BG_WHITE;
if (strcmp(color, "yellow") == 0) return fg ? COLOR_FG_YELLOW : COLOR_BG_YELLOW;
return "";
}
void entry_copy_keys(struct Entry* entry) {
int j = 0;
entry->keys = xmalloc(entry->keys_count * sizeof *entry->keys);
for (size_t i = 0; i < COUNT_OF(g_parameter_keys); ++i) {
if (g_parameter_keys[i].val) {
entry->keys[j++] = g_parameter_keys[i];
g_parameter_keys[i].val = NULL;
}
}
}
struct Entry* parse_entry(char* ptr) {
struct Entry* entry;
if (string_startswith(ptr, "[Entry]")) entry = entry_create(ET_REG);
else if (string_startswith(ptr, "[Header]")) entry = entry_create(ET_HEADER);
else return NULL;
while ( (ptr = next_line(ptr)) ) {
if (string_startswith(ptr, "["))
break;
for (size_t i = 0; i < COUNT_OF(g_parameter_keys); ++i) {
if (string_startswith(ptr, g_parameter_keys[i].key)) {
g_parameter_keys[i].val = get_value(ptr);
++entry->keys_count;
}
}
}
entry_copy_keys(entry);
return entry;
}
struct Entry* parse_entries(char* file_content) {
struct Entry* entry_head = NULL;
struct Entry* entry_curr = NULL;
char* ptr = file_content;
do {
entry_curr = string_startswith(ptr, "[") ? parse_entry(ptr) : NULL;
if (entry_curr)
if (entry_head)
entry_append(entry_head, entry_curr);
else
entry_head = entry_curr;
} while ( (ptr = next_line(ptr)) );
free(file_content);
return entry_head;
}
void select_entry(struct Entry* entry) {
if (entry->type != ET_REG)
select_entry(entry->next);
else
g_selected = entry;
}
void select_next(void) {
if (g_selected->next)
g_selected = g_selected->next;
else if (g_selected->type != ET_REG)
select_prev();
if (g_selected->type != ET_REG)
select_next();
}
void select_prev(void) {
if (g_selected->prev)
g_selected = g_selected->prev;
else if (g_selected->type != ET_REG)
select_next();
if (g_selected->type != ET_REG)
select_prev();
}
void cursor_pos(int x, int y) {
printf("\033[%d;%df", y, x);
}
void cursor_visible(int vis) {
printf(vis ? "\033[?25h" : "\033[?25l");
}
char* get_key(struct Entry* entry, char* key) {
for (size_t i = 0; i < entry->keys_count; ++i)
if (strcmp(key, entry->keys[i].key) == 0)
return entry->keys[i].val;
return "";
}
char* cmd_output(char* cmd) {
FILE *file_ptr;
char buf[BUFSIZ];
file_ptr = popen(cmd, "r");
if (file_ptr == NULL) {
perror("popen");
exit(1);
}
while (fgets(buf, sizeof(buf) - 1, file_ptr) != NULL) {
char* ptr = buf;
while (*ptr && *ptr != '\n')
++ptr;
if (*ptr == '\n')
*ptr = '\0';
}
pclose(file_ptr);
return string_dup(buf);
}
void entry_print(struct Entry* entry, int selected) {
char* entry_str = NULL;
int allow_color = 1;
if (entry->type == ET_REG && strcmp(get_key(entry, "colormode"), "selected") == 0)
allow_color = selected;
printf("%s%s%s%s%s%-*s",
entry->type == ET_HEADER ? "\033[4m" : "",
allow_color ? parse_color(get_key(entry, "fgcolor"), 1) : "",
allow_color ? parse_color(get_key(entry, "bgcolor"), 0) : "",
*get_key(entry, "runstr") ? entry_str = cmd_output(get_key(entry, "str")) : get_key(entry, "str"),
selected ? " (*)" : "",
g_window.ws_col,
COLOR_RESET);
free(entry_str);
}
void draw(struct Entry* head) {
struct Entry* cursor = head;
int x, y;
ioctl(0, TIOCGWINSZ, &g_window);
/* Scrolling */
for (size_t i = 0; (g_window.ws_row + i) <= g_selected->index; ++i)
if (cursor->next)
cursor = cursor->next;
x = y = 0;
while (cursor) {
if (++y <= g_window.ws_row)
cursor_pos(x, y);
else
break;
if (cursor->type == ET_HEADER)
entry_print(cursor, 0);
if (cursor->type == ET_REG)
entry_print(cursor, (cursor == g_selected));
cursor = cursor->next;
}
fflush(stdout);
}
void restore_terminal_mode(void) {
tcsetattr(0, TCSANOW, &g_termios_original);
cursor_pos(0, 0);
cursor_visible(1);
}
void set_terminal_mode(void) {
struct termios termios_new;
tcgetattr(0, &g_termios_original);
memcpy(&termios_new, &g_termios_original, sizeof termios_new);
cfmakeraw(&termios_new);
tcsetattr(0, TCSANOW, &termios_new);
cursor_visible(0);
}
int key_pressed(void) {
fd_set fds;
struct timeval tv = { 0L, 0L };
FD_ZERO(&fds);
FD_SET(0, &fds);
return select(1, &fds, NULL, NULL, &tv) > 0;
}
int32_t getch(void) {
char buf[4] = {0};
return (read(0, buf, 4) != -1) ? *(int32_t*) buf : -1;
}
/* entry_execute is not the correct name for this, since it does not
actually do anything to the entry. */
void execute_entry(struct Entry* entry) {
/* Restore so the application we run looks as it should */
restore_terminal_mode();
cursor_visible(1);
clear_screen();
system(get_key(entry, "exec"));
cursor_visible(0);
set_terminal_mode();
if (*get_key(entry, "wait"))
getch();
if (*get_key(entry, "exit"))
clean_exit();
clear_screen();
}
void clean_exit(void) {
while (g_head->next && (g_head = g_head->next))
entry_destroy(g_head->prev);
entry_destroy(g_head);
restore_terminal_mode();
clear_screen();
exit(EXIT_SUCCESS);
}
void print_usage(void) {
printf
(
"Usage:\n"
" climenu [ENTRIES PATH] [UPDATE INTERVAL]\n\n"
" If no entries file is provided, climenu\n"
" will attempt to read entries from stdin.\n\n"
"Keys:\n"
" Navigate: JK, UP/DOWN arrows.\n"
" Select: Space, Enter\n"
" Exit: CTRL+C, Q\n\n"
"Entry types:\n"
" [Header]: Defines a menu header with a text description.\n"
" [Entry]: Defines a button with a label and a shell command to execute.\n\n"
"Entry properties:\n"
" [Header] and [Entry]:\n"
" <str>: Specifies the text to display for the header or button.\n"
" fgcolor: foreground color. [black,blue,cyan,green,magenta,red,white,yellow]\n"
" bgcolor: background color. [black,blue,cyan,green,magenta,red,white,yellow]\n"
" runstr: Execute the entry string and display the result [true]\n\n"
" [Entry]:\n"
" <exec>: Specifies the shell command to execute when the button is pressed.\n"
" exit: Exit after executing an entry command. [true]\n"
" wait: Waits for a key press after executing the command. [true]\n"
" colormode: When the entry should be displayed in color. [selected]\n"
);
}
int main(int argc, char** argv) {
int refresh = 0;
int time_passed = 0;
int32_t ch;
if (argc == 1) {
g_head = parse_entries(read_stdin());
}
if (argc == 2) {
if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
print_usage();
return 0;
}
if ((refresh = atoi(argv[1])) != 0)
g_head = parse_entries(read_stdin());
else
g_head = parse_entries(read_file(argv[1]));
}
if (argc == 3) {
g_head = parse_entries(read_file(argv[1]));
refresh = atoi(argv[2]);
}
if (g_head == NULL) {
print_usage();
return 1;
}
select_entry(g_head);
set_terminal_mode();
clear_screen();
while (1) {
if (refresh) {
draw(g_head);
while (time_passed < refresh * 1000) {
sleep_ms(10);
time_passed += 10;
if (key_pressed()) {
draw(g_head);
ch = getch();
goto handle_input;
} else {
continue;
}
}
time_passed = 0;
continue;
} else {
draw(g_head);
ch = getch();
}
handle_input:
if (ch == KEY_K || ch == KEY_UP) select_prev();
if (ch == KEY_J || ch == KEY_DOWN) select_next();
if (ch == KEY_SPACE || ch == KEY_ENTER) execute_entry(g_selected);
if (ch == KEY_Q || ch == KEY_CTRLC) clean_exit();
}
return EXIT_SUCCESS;
}