Mercurial > vim
annotate src/README.md @ 19485:a09636ecee3c v8.2.0300
patch 8.2.0300: Vim9: expression test fails without channel support
Commit: https://github.com/vim/vim/commit/b4d2cb1083974a7a7262417d09baf474ca816452
Author: Bram Moolenaar <Bram@vim.org>
Date: Sat Feb 22 20:33:08 2020 +0100
patch 8.2.0300: Vim9: expression test fails without channel support
Problem: Vim9: expression test fails without channel support.
Solution: Add has('channel') check.
author | Bram Moolenaar <Bram@vim.org> |
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date | Sat, 22 Feb 2020 20:45:03 +0100 |
parents | a961efb326e5 |
children | 00a1b89256ea |
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1 ![Vim Logo](https://github.com/vim/vim/blob/master/runtime/vimlogo.gif) |
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2 |
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3 # Vim source code # |
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4 |
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5 Here are a few hints for finding your way around the source code. This |
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6 doesn't make it less complex than it is, but it gets you started. |
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7 |
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8 You might also want to read |
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9 [`:help development`](http://vimdoc.sourceforge.net/htmldoc/develop.html#development). |
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10 |
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11 |
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12 ## Jumping around ## |
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13 |
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14 First of all, use `:make tags` to generate a tags file, so that you can jump |
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15 around in the source code. |
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16 |
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17 To jump to a function or variable definition, move the cursor on the name and |
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18 use the `CTRL-]` command. Use `CTRL-T` or `CTRL-O` to jump back. |
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19 |
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20 To jump to a file, move the cursor on its name and use the `gf` command. |
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21 |
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22 Most code can be found in a file with an obvious name (incomplete list): |
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23 |
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24 File name | Description |
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25 --------------- | ----------- |
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26 arglist.c | handling argument list |
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27 autocmd.c | autocommands |
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28 blob.c | blob data type |
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29 buffer.c | manipulating buffers (loaded files) |
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30 bufwrite.c | writing a buffer to file |
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31 change.c | handling changes to text |
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32 cindent.c | C and Lisp indentation |
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33 cmdexpand.c | command-line completion |
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34 cmdhist.c | command-line history |
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35 debugger.c | vim script debugger |
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36 diff.c | diff mode (vimdiff) |
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37 drawline.c | drawing a window line |
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38 drawscreen.c | drawing the windows |
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39 eval.c | expression evaluation |
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40 evalbuffer.c | buffer related built-in functions |
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41 evalfunc.c | built-in functions |
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42 evalvars.c | vim variables |
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43 evalwindow.c | window related built-in functions |
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44 fileio.c | reading and writing files |
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45 filepath.c | dealing with file names and paths |
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46 findfile.c | search for files in 'path' |
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47 fold.c | folding |
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48 getchar.c | getting characters and key mapping |
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49 highlight.c | syntax highlighting |
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50 indent.c | text indentation |
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51 insexpand.c | Insert mode completion |
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52 mark.c | marks |
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53 map.c | mapping and abbreviations |
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54 mbyte.c | multi-byte character handling |
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55 memfile.c | storing lines for buffers in a swapfile |
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56 memline.c | storing lines for buffers in memory |
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57 menu.c | menus |
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58 message.c | (error) messages |
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59 mouse.c | handling the mouse |
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60 ops.c | handling operators ("d", "y", "p") |
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61 option.c | options |
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62 optionstr.c | handling string options |
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63 popupmenu.c | popup menu |
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64 popupwin.c | popup window |
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65 profiler.c | vim script profiler |
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66 quickfix.c | quickfix commands (":make", ":cn") |
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67 regexp.c | pattern matching |
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68 register.c | handling registers |
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69 scriptfile.c | runtime directory handling and sourcing scripts |
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70 screen.c | lower level screen functions |
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71 search.c | pattern searching |
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72 session.c | sessions and views |
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73 sign.c | signs |
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74 spell.c | spell checking core |
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75 spellfile.c | spell file handling |
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76 spellsuggest.c | spell correction suggestions |
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77 syntax.c | syntax and other highlighting |
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78 tag.c | tags |
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79 term.c | terminal handling, termcap codes |
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80 testing.c | testing: assert and test functions |
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81 textprop.c | text properties |
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82 time.c | time and timer functions |
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83 undo.c | undo and redo |
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84 usercmd.c | user defined commands |
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85 userfunc.c | user defined functions |
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86 viminfo.c | viminfo handling |
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87 window.c | handling split windows |
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88 |
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89 |
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90 ## Debugging ## |
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91 |
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92 If you have a reasonable recent version of gdb, you can use the `:Termdebug` |
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93 command to debug Vim. See `:help :Termdebug`. |
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94 |
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95 When something is time critical or stepping through code is a hassle, use the |
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96 channel logging to create a time-stamped log file. Add lines to the code like |
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97 this: |
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98 |
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99 ch_log(NULL, "Value is now %02x", value); |
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100 |
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101 After compiling and starting Vim, do: |
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102 |
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103 :call ch_logfile('debuglog', 'w') |
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104 |
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105 And edit `debuglog` to see what happens. The channel functions already have |
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106 `ch_log()` calls, thus you always see that in the log. |
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107 |
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108 |
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109 ## Important Variables ## |
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110 |
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111 The current mode is stored in `State`. The values it can have are `NORMAL`, |
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112 `INSERT`, `CMDLINE`, and a few others. |
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113 |
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114 The current window is `curwin`. The current buffer is `curbuf`. These point |
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115 to structures with the cursor position in the window, option values, the file |
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116 name, etc. These are defined in |
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117 [`structs.h`](https://github.com/vim/vim/blob/master/src/structs.h). |
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118 |
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119 All the global variables are declared in |
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120 [`globals.h`](https://github.com/vim/vim/blob/master/src/globals.h). |
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121 |
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122 |
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123 ## The main loop ## |
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124 |
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125 This is conveniently called `main_loop()`. It updates a few things and then |
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126 calls `normal_cmd()` to process a command. This returns when the command is |
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127 finished. |
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128 |
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129 The basic idea is that Vim waits for the user to type a character and |
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130 processes it until another character is needed. Thus there are several places |
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131 where Vim waits for a character to be typed. The `vgetc()` function is used |
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132 for this. It also handles mapping. |
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133 |
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134 Updating the screen is mostly postponed until a command or a sequence of |
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135 commands has finished. The work is done by `update_screen()`, which calls |
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136 `win_update()` for every window, which calls `win_line()` for every line. |
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137 See the start of |
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138 [`screen.c`](https://github.com/vim/vim/blob/master/src/screen.c) |
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139 for more explanations. |
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140 |
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141 |
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142 ## Command-line mode ## |
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143 |
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144 When typing a `:`, `normal_cmd()` will call `getcmdline()` to obtain a line |
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145 with an Ex command. `getcmdline()` contains a loop that will handle each typed |
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146 character. It returns when hitting `CR` or `Esc` or some other character that |
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147 ends the command line mode. |
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148 |
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149 |
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150 ## Ex commands ## |
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151 |
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152 Ex commands are handled by the function `do_cmdline()`. It does the generic |
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153 parsing of the `:` command line and calls `do_one_cmd()` for each separate |
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154 command. It also takes care of while loops. |
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155 |
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156 `do_one_cmd()` parses the range and generic arguments and puts them in the |
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157 `exarg_t` and passes it to the function that handles the command. |
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158 |
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159 The `:` commands are listed in `ex_cmds.h`. The third entry of each item is |
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160 the name of the function that handles the command. The last entry are the |
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161 flags that are used for the command. |
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162 |
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163 |
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164 ## Normal mode commands ## |
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165 |
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166 The Normal mode commands are handled by the `normal_cmd()` function. It also |
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167 handles the optional count and an extra character for some commands. These |
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168 are passed in a `cmdarg_t` to the function that handles the command. |
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169 |
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170 There is a table `nv_cmds` in |
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171 [`normal.c`](https://github.com/vim/vim/blob/master/src/normal.c) |
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172 which lists the first character of every command. The second entry of each |
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173 item is the name of the function that handles the command. |
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174 |
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175 |
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176 ## Insert mode commands ## |
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177 |
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178 When doing an `i` or `a` command, `normal_cmd()` will call the `edit()` |
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179 function. It contains a loop that waits for the next character and handles it. |
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180 It returns when leaving Insert mode. |
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181 |
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182 |
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183 ## Options ## |
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184 |
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185 There is a list with all option names in |
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186 [`option.c`](https://github.com/vim/vim/blob/master/src/option.c), |
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187 called `options[]`. |
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188 |
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189 |
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190 ## The GUI ## |
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191 |
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192 Most of the GUI code is implemented like it was a clever terminal. Typing a |
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193 character, moving a scrollbar, clicking the mouse, etc. are all translated |
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194 into events which are written in the input buffer. These are read by the |
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195 main code, just like reading from a terminal. The code for this is scattered |
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196 through [`gui.c`](https://github.com/vim/vim/blob/master/src/gui.c). |
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197 For example, `gui_send_mouse_event()` for a mouse click and `gui_menu_cb()` for |
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198 a menu action. Key hits are handled by the system-specific GUI code, which |
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199 calls `add_to_input_buf()` to send the key code. |
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200 |
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201 Updating the GUI window is done by writing codes in the output buffer, just |
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202 like writing to a terminal. When the buffer gets full or is flushed, |
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203 `gui_write()` will parse the codes and draw the appropriate items. Finally the |
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204 system-specific GUI code will be called to do the work. |
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205 |
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206 |
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207 ## Debugging the GUI ## |
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208 |
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209 Remember to prevent that gvim forks and the debugger thinks Vim has exited, |
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210 add the `-f` argument. In gdb: `run -f -g`. |
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211 |
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212 When stepping through display updating code, the focus event is triggered |
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213 when going from the debugger to Vim and back. To avoid this, recompile with |
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214 some code in `gui_focus_change()` disabled. |
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215 |
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216 |
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217 ## Contributing ## |
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218 |
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219 If you would like to help making Vim better, see the |
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220 [`CONTRIBUTING.md`](https://github.com/vim/vim/blob/master/CONTRIBUTING.md) |
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221 file. |
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222 |
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patch 8.1.1069: source README file doesn't look nice on github
Bram Moolenaar <Bram@vim.org>
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18879 | 224 This is `README.md` for version 8.2 of the Vim source code. |