diff-merges.c

   1 #include "diff-merges.h"
   2
   3 #include "revision.h"
   4
   5 typedef void (*diff_merges_setup_func_t)(struct rev_info *);
   6 static void set_separate(struct rev_info *revs);
   7
   8 static diff_merges_setup_func_t set_to_default = set_separate;
   9
  10 static void suppress(struct rev_info *revs)
  11 {
  12         revs->separate_merges = 0;
  13         revs->first_parent_merges = 0;
  14         revs->combine_merges = 0;
  15         revs->dense_combined_merges = 0;
  16         revs->combined_all_paths = 0;
  17         revs->combined_imply_patch = 0;
  18         revs->merges_need_diff = 0;
  19 }
  20
  21 static void set_separate(struct rev_info *revs)
  22 {
  23         suppress(revs);
  24         revs->separate_merges = 1;
  25 }
  26
  27 static void set_first_parent(struct rev_info *revs)
  28 {
  29         set_separate(revs);
  30         revs->first_parent_merges = 1;
  31 }
  32
  33 static void set_m(struct rev_info *revs)
  34 {
  35         /*
  36          * To "diff-index", "-m" means "match missing", and to the "log"
  37          * family of commands, it means "show default diff for merges". Set
  38          * both fields appropriately.
  39          */
  40         set_to_default(revs);
  41         revs->match_missing = 1;
  42 }
  43
  44 static void set_combined(struct rev_info *revs)
  45 {
  46         suppress(revs);
  47         revs->combine_merges = 1;
  48         revs->dense_combined_merges = 0;
  49 }
  50
  51 static void set_dense_combined(struct rev_info *revs)
  52 {
  53         suppress(revs);
  54         revs->combine_merges = 1;
  55         revs->dense_combined_merges = 1;
  56 }
  57
  58 static diff_merges_setup_func_t func_by_opt(const char *optarg)
  59 {
  60         if (!strcmp(optarg, "off") || !strcmp(optarg, "none"))
  61                 return suppress;
  62         if (!strcmp(optarg, "1") || !strcmp(optarg, "first-parent"))
  63                 return set_first_parent;
  64         else if (!strcmp(optarg, "separate"))
  65                 return set_separate;
  66         else if (!strcmp(optarg, "c") || !strcmp(optarg, "combined"))
  67                 return set_combined;
  68         else if (!strcmp(optarg, "cc") || !strcmp(optarg, "dense-combined"))
  69                 return set_dense_combined;
  70         else if (!strcmp(optarg, "m") || !strcmp(optarg, "on"))
  71                 return set_to_default;
  72         return NULL;
  73 }
  74
  75 static void set_diff_merges(struct rev_info *revs, const char *optarg)
  76 {
  77         diff_merges_setup_func_t func = func_by_opt(optarg);
  78
  79         if (!func)
  80                 die(_("unknown value for --diff-merges: %s"), optarg);
  81
  82         func(revs);
  83
  84         /* NOTE: the merges_need_diff flag is cleared by func() call */
  85         if (func != suppress)
  86                 revs->merges_need_diff = 1;
  87 }
  88
  89 /*
  90  * Public functions. They are in the order they are called.
  91  */
  92
  93 int diff_merges_config(const char *value)
  94 {
  95         diff_merges_setup_func_t func = func_by_opt(value);
  96
  97         if (!func)
  98                 return -1;
  99
 100         set_to_default = func;
 101         return 0;
 102 }
 103
 104 int diff_merges_parse_opts(struct rev_info *revs, const char **argv)
 105 {
 106         int argcount = 1;
 107         const char *optarg;
 108         const char *arg = argv[0];
 109
 110         if (!strcmp(arg, "-m")) {
 111                 set_m(revs);
 112         } else if (!strcmp(arg, "-c")) {
 113                 set_combined(revs);
 114                 revs->combined_imply_patch = 1;
 115         } else if (!strcmp(arg, "--cc")) {
 116                 set_dense_combined(revs);
 117                 revs->combined_imply_patch = 1;
 118         } else if (!strcmp(arg, "--no-diff-merges")) {
 119                 suppress(revs);
 120         } else if (!strcmp(arg, "--combined-all-paths")) {
 121                 revs->combined_all_paths = 1;
 122         } else if ((argcount = parse_long_opt("diff-merges", argv, &optarg))) {
 123                 set_diff_merges(revs, optarg);
 124         } else
 125                 return 0;
 126
 127         revs->explicit_diff_merges = 1;
 128         return argcount;
 129 }
 130
 131 void diff_merges_suppress(struct rev_info *revs)
 132 {
 133         suppress(revs);
 134 }
 135
 136 void diff_merges_default_to_first_parent(struct rev_info *revs)
 137 {
 138         if (!revs->explicit_diff_merges)
 139                 revs->separate_merges = 1;
 140         if (revs->separate_merges)
 141                 revs->first_parent_merges = 1;
 142 }
 143
 144 void diff_merges_default_to_dense_combined(struct rev_info *revs)
 145 {
 146         if (!revs->explicit_diff_merges)
 147                 set_dense_combined(revs);
 148 }
 149
 150 void diff_merges_set_dense_combined_if_unset(struct rev_info *revs)
 151 {
 152         if (!revs->combine_merges)
 153                 set_dense_combined(revs);
 154 }
 155
 156 void diff_merges_setup_revs(struct rev_info *revs)
 157 {
 158         if (revs->combine_merges == 0)
 159                 revs->dense_combined_merges = 0;
 160         if (revs->separate_merges == 0)
 161                 revs->first_parent_merges = 0;
 162         if (revs->combined_all_paths && !revs->combine_merges)
 163                 die("--combined-all-paths makes no sense without -c or --cc");
 164         if (revs->combined_imply_patch)
 165                 revs->diff = 1;
 166         if (revs->combined_imply_patch || revs->merges_need_diff) {
 167                 if (!revs->diffopt.output_format)
 168                         revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 169         }
 170 }