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scid: implement themes in javascript
author David Demelier <markand@malikania.fr>
date Thu, 04 Aug 2022 06:09:54 +0200
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children 695637f1d8a7
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1 #include <assert.h>
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2 #include <errno.h>
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3 #include <limits.h>
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4 #include <string.h>
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5
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6 #include <duktape.h>
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7
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8 #include "log.h"
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9 #include "theme.h"
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10 #include "util.h"
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11
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12 struct theme {
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13 char base[PATH_MAX];
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14 duk_context *ctx;
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15 };
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16
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17 static char *
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18 render(struct theme *t, const char *json, const char *function)
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19 {
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20 char *ret = NULL;
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21
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22 duk_get_global_string(t->ctx, function);
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23
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24 if (!duk_is_callable(t->ctx, -1)) {
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25 duk_pop(t->ctx);
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26 return NULL;
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27 }
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29 duk_push_string(t->ctx, json);
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30 duk_json_decode(t->ctx, -1);
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31
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32 if (duk_pcall(t->ctx, 1) != 0) {
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33 log_warn("theme: %s", duk_safe_to_string(t->ctx, -1));
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34 } else if (duk_is_string(t->ctx, -1))
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35 ret = util_strdup(duk_get_string(t->ctx, -1));
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36
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37 duk_pop_n(t->ctx, 1);
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38
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39 /*
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40 * For convenience, otherwise all callers have to check for non-NULL
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41 * after calling the function.
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42 */
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43 if (!ret)
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44 ret = util_strdup("");
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45
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46 return ret;
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47 }
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48
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49 const char *
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50 theme_path(struct theme *t, const char *filename)
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51 {
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52 assert(filename);
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53
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54 /* Build path to the template file. */
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55 static _Thread_local char path[PATH_MAX];
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56
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57 snprintf(path, sizeof (path), "%s/%s", t->base, filename);
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58
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59 return path;
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60 }
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61
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62 struct theme *
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63 theme_open(const char *directory)
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64 {
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65 assert(directory);
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66
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67 struct theme *t;
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68 char themefile[PATH_MAX], *data;
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69
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70 t = util_calloc(1, sizeof (*t));
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71 t->ctx = duk_create_heap_default();
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72 util_strlcpy(t->base, directory, sizeof (t->base));
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73
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74 /* Open theme.js in the directory. */
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75 snprintf(themefile, sizeof (themefile), "%s/theme.js", t->base);
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76
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77 if (!(data = util_read(themefile)))
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78 log_warn("theme: %s: %s", themefile, strerror(errno));
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79 else {
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80 if (duk_peval_string(t->ctx, data) != 0)
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81 log_warn("theme: %s", duk_safe_to_string(t->ctx, -1));
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82
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83 duk_pop(t->ctx);
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84 }
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85
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86 return t;
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87 }
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88
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89 char *
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90 theme_render_index(struct theme *t, const char *json)
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91 {
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92 assert(t);
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93 assert(json);
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94
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95 return render(t, json, "index");
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96 }
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97
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98 void
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99 theme_free(struct theme *t)
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100 {
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101 assert(t);
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102
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103 duk_destroy_heap(t->ctx);
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104 }