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35 /*! \libinternal \file
37 * Declares common string formatting routines for online help.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_onlinehelp
43 #ifndef GMX_ONLINEHELP_HELPFORMAT_H
44 #define GMX_ONLINEHELP_HELPFORMAT_H
52 class HelpWriterContext;
54 /*! \libinternal \brief
55 * Formats rows of a table for text output.
57 * This utility class formats tabular data, mainly for console output.
58 * Each row in the table can take multiple lines, and automatic text wrapping
59 * is supported. If text overflows the allocated width, the remaining columns
60 * on that line become shifted. To avoid this, it is possible to start the
61 * output for different columns from different lines (it is the caller's
62 * responsibility to check that overflows are avoided or are acceptable).
64 * Column definitions are first set with addColumn().
65 * To format a row, first call clear(). Then call addColumnLine() to add text
66 * to each column (can be called multiple times on a single column to add
67 * multiple lines), and possibly setColumnFirstLineOffset() to adjust the line
68 * from which the column output should start. Finally, call formatRow() to
69 * obtain the formatted row.
71 * A header (column titles and a horizontal line) is printed before the first
76 gmx::TextTableFormatter formatter;
77 formatter.addColumn("Name", 10, false);
78 formatter.addColumn("Type", 10, false);
79 formatter.addColumn("Description", 50, true);
82 formatter.addColumnLine(0, "name");
83 formatter.addColumnLine(1, "type");
84 formatter.addColumnLine(2, "Description for name");
85 printf("%s", formatter.formatRow().c_str());
88 formatter.addColumnLine(0, "averylongname");
89 formatter.addColumnLine(1, "type");
90 formatter.setColumnFirstLineOffset(1, 1);
91 formatter.addColumnLine(2, "Description for name");
92 printf("%s", formatter.formatRow().c_str());
94 // format other rows by repeating the above code
97 * Methods in this class may throw std::bad_alloc if out of memory.
98 * Other exceptions are not thrown.
101 * \ingroup module_onlinehelp
103 class TextTableFormatter
106 //! Constructs an empty formatter.
107 TextTableFormatter();
108 ~TextTableFormatter();
111 * Adds a column to the table.
113 * \param[in] title Title string for the column (used for header).
114 * \param[in] width Width of the column (must be > 0).
115 * \param[in] bWrap Whether text that exceeds \p width is
116 * automatically wrapped.
118 * The length of \p title must not exceed \p width.
120 void addColumn(const char* title, int width, bool bWrap);
122 * Sets amount on indentation before the first column.
124 * \param[in] indent Number of spaces to use for indenting.
128 void setFirstColumnIndent(int indent);
130 * Enables folding the last column to separate lines if it overflows.
132 * \param[in] indent Number of spaces to use for indenting the lines.
134 * If called with `indent >= 0`, the last column for each row is
135 * treated specially: if it contains more lines than the other columns,
136 * and if the text would fit more compactly as separate lines after the
137 * row, then the whole last column is written after the row with the
138 * given \p indent. The column text then spans the whole space
139 * reserved for the table, making long text fit into a smaller amount
141 * If not called, the last column is not treates specially.
145 void setFoldLastColumnToNextLine(int indent);
148 * Whether formatRow() has been successfully called.
150 * This method can be used to determine after-the-fact whether anything
151 * was written in the table.
155 bool didOutput() const;
158 * Removes all text from all columns and resets the line offsets.
160 * Removes all text added using addColumnLine() and resets line offsets
161 * set with setColumnFirstLineOffset() to zero.
162 * Should be called before starting to add data for a row.
168 * Adds text to be printed in a column.
170 * \param[in] index Zero-based column index.
171 * \param[in] text Text to add.
173 * Can be called multiple times. Additional calls append \p text as
174 * additional lines. Any calls with \p text empty have no effect.
175 * To add an empty line, use "\n" as \p text.
177 * If \p text contains newlines, the text is automatically splitted to
178 * multiple lines. The same happens if automatic wrapping is on for
179 * the column and the text contains lines that are longer than what
182 void addColumnLine(int index, const std::string& text);
184 * Adds text containing help markup to be printed in a column.
186 * \param[in] index Zero-based column index.
187 * \param[in] context Context to use for markup processing.
188 * \param[in] text Text to add.
190 * Works as addColumnLine(), except that it uses
191 * HelpWriterContext::substituteMarkupAndWrapToVector() to process
192 * markup in the input text instead of just wrapping it as plain text.
194 void addColumnHelpTextBlock(int index, const HelpWriterContext& context, const std::string& text);
196 * Sets the first line to which text is printed for a column.
198 * \param[in] index Zero-based column index.
199 * \param[in] firstLine Zero-based line index from which to start the
202 * Can be called if there is no text for column \p index.
203 * Does not affect the output in this case.
207 void setColumnFirstLineOffset(int index, int firstLine);
209 * Formats the lines for the current row.
211 * \returns Current row formatted as a single string
212 * (contains newlines).
214 * Formats the data as set after the previous clear()/formatRow() using
215 * addColumnLine() and setColumnFirstLineOffset().
217 * If this is the first line to be formatted, a header is also added to
218 * the beginning of the returned string if any column has a title.
220 * The return value always terminates with a newline.
222 * Calls clear() on successful return.
224 std::string formatRow();
229 std::unique_ptr<Impl> impl_;