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>
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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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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12 ## Jumping around ##
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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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22 Most code can be found in a file with an obvious name (incomplete list):
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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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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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223
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af69c9335223 Vim 8.2 release
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224 This is `README.md` for version 8.2 of the Vim source code.