feat(ex): add `:log` command

4 files changed, 75 insertions, 0 deletions

diff --git a/src/nvim/cmdexpand.c b/src/nvim/cmdexpand.c
index 04fcde7ee6..6030197357 100644
--- a/src/nvim/cmdexpand.c
+++ b/src/nvim/cmdexpand.c
@@ -1304,6 +1304,7 @@ char *addstar(char *fname, size_t len, int context)
             && fname[0] == '/')
         || context == EXPAND_CHECKHEALTH
         || context == EXPAND_LSP
+        || context == EXPAND_LOG
         || context == EXPAND_LUA) {
       retval = xstrnsave(fname, len);
     } else {
@@ -2316,6 +2317,10 @@ static const char *set_context_by_cmdname(const char *cmd, cmdidx_T cmdidx, expa
     xp->xp_context = EXPAND_CHECKHEALTH;
     break;
 
+  case CMD_log:
+    xp->xp_context = EXPAND_LOG;
+    break;
+
   case CMD_lsp:
     xp->xp_context = EXPAND_LSP;
     break;
@@ -2858,6 +2863,43 @@ static char *get_healthcheck_names(expand_T *xp FUNC_ATTR_UNUSED, int idx)
   return NULL;
 }
 
+/// Completion for |:log| command.
+///
+/// Given to ExpandGeneric() to obtain `:log` completion.
+/// @param[in] idx  Index of the item.
+/// @param[in] xp  Not used.
+static char *get_log_arg(expand_T *xp FUNC_ATTR_UNUSED, int idx)
+{
+  static Object names = OBJECT_INIT;
+  static char *last_xp_line = NULL;
+  static unsigned last_gen = 0;
+
+  if (last_xp_line == NULL || strcmp(last_xp_line,
+                                     xp->xp_line) != 0
+      || last_gen != get_cmdline_last_prompt_id()) {
+    xfree(last_xp_line);
+    last_xp_line = xstrdup(xp->xp_line);
+    MAXSIZE_TEMP_ARRAY(args, 1);
+    Error err = ERROR_INIT;
+
+    ADD_C(args, CSTR_AS_OBJ(xp->xp_line));
+    // Build the current command line as a Lua string argument
+    Object res = NLUA_EXEC_STATIC("return require'vim._core.ex_cmd'.log_complete(...)", args,
+                                  kRetObject, NULL,
+                                  &err);
+    api_clear_error(&err);
+    api_free_object(names);
+    names = res;
+    last_gen = get_cmdline_last_prompt_id();
+  }
+
+  if (names.type == kObjectTypeArray && idx < (int)names.data.array.size
+      && names.data.array.items[idx].type == kObjectTypeString) {
+    return names.data.array.items[idx].data.string.data;
+  }
+  return NULL;
+}
+
 /// Completion for |:lsp| command.
 ///
 /// Given to ExpandGeneric() to obtain `:lsp` completion.
@@ -2937,6 +2979,7 @@ static int ExpandOther(char *pat, expand_T *xp, regmatch_T *rmp, char ***matches
     { EXPAND_SCRIPTNAMES, get_scriptnames_arg, true, false },
     { EXPAND_RETAB, get_retab_arg, true, true },
     { EXPAND_CHECKHEALTH, get_healthcheck_names, true, false },
+    { EXPAND_LOG, get_log_arg, true, false },
     { EXPAND_LSP, get_lsp_arg, true, false },
   };
   int ret = FAIL;
diff --git a/src/nvim/cmdexpand_defs.h b/src/nvim/cmdexpand_defs.h
index 3535e216d6..532ea7fd11 100644
--- a/src/nvim/cmdexpand_defs.h
+++ b/src/nvim/cmdexpand_defs.h
@@ -119,6 +119,7 @@ enum {
   EXPAND_CHECKHEALTH,
   EXPAND_LUA,
   EXPAND_LSP,
+  EXPAND_LOG,
 };
 
 /// Type used by ExpandGeneric()
diff --git a/src/nvim/ex_cmds.lua b/src/nvim/ex_cmds.lua
index 93cc0f3bfe..679b2d25ae 100644
--- a/src/nvim/ex_cmds.lua
+++ b/src/nvim/ex_cmds.lua
@@ -1587,6 +1587,12 @@ M.cmds = {
     func = 'ex_lockvar',
   },
   {
+    command = 'log',
+    flags = bit.bor(EXTRA, TRLBAR),
+    addr_type = 'ADDR_NONE',
+    func = 'ex_log',
+  },
+  {
     command = 'lolder',
     flags = bit.bor(RANGE, COUNT, TRLBAR),
     addr_type = 'ADDR_UNSIGNED',
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 2f332a6e33..3971bf998b 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -8291,6 +8291,31 @@ static void ex_terminal(exarg_T *eap)
   do_cmdline_cmd(ex_cmd);
 }
 
+/// ":log {name}"
+static void ex_log(exarg_T *eap)
+{
+  Error err = ERROR_INIT;
+  MAXSIZE_TEMP_ARRAY(args, 2);
+
+  char mods[1024];
+  size_t mods_len = 0;
+  mods[0] = NUL;
+
+  if (cmdmod.cmod_tab > 0 || cmdmod.cmod_split != 0) {
+    bool multi_mods = false;
+    mods_len = add_win_cmd_modifiers(mods, &cmdmod, &multi_mods);
+    assert(mods_len < sizeof(mods));
+  }
+  ADD_C(args, CSTR_AS_OBJ(eap->arg));
+  ADD_C(args, STRING_OBJ(((String){ .data = mods, .size = mods_len })));
+
+  NLUA_EXEC_STATIC("require'vim._core.ex_cmd'.ex_log(...)", args, kRetNilBool, NULL, &err);
+  if (ERROR_SET(&err)) {
+    emsg_multiline(err.msg, "lua_error", HLF_E, true);
+  }
+  api_clear_error(&err);
+}
+
 /// ":lsp {subcmd} {clients}"
 static void ex_lsp(exarg_T *eap)
 {